render.py

                    material_index = f.material_index
                    material = me_materials[material_index]

                    if material and material.use_vertex_color_paint:

                        col = vcol_layer[fi]

                        if len(faces_verts[fi]) == 4:
                            cols = col.color1, col.color2, col.color3, col.color4
                        else:
                            cols = col.color1, col.color2, col.color3

                        for col in cols:
                            key = col[0], col[1], col[2], material_index  # Material index!
                            vertCols[key] = [-1]

                    else:
                        if material:
                            diffuse_color = material.diffuse_color[:]
                            key = diffuse_color[0], diffuse_color[1], diffuse_color[2], \
                                  material_index
                            vertCols[key] = [-1]

            else:
                # No vertex colours, so write material colours as vertex colours
                for i, material in enumerate(me_materials):

                    if material:
                        diffuse_color = material.diffuse_color[:]
                        key = diffuse_color[0], diffuse_color[1], diffuse_color[2], i  # i == f.mat
                        vertCols[key] = [-1]

            # Vert Colours
            tabWrite("texture_list {\n")
            file.write(tabStr + "%s" % (len(vertCols)))  # vert count
            idx = 0

            for col, index in vertCols.items():
                if me_materials:
                    material = me_materials[col[3]]
                    material_finish = materialNames[material.name]

                    if material.use_transparency:
                        trans = 1.0 - material.alpha
                    else:
                        trans = 0.0

                    if material.use_transparency and material.transparency_method == 'RAYTRACE':
                        povFilter = material.raytrace_transparency.filter * (1.0 - material.alpha)
                        trans = (1.0 - material.alpha) - povFilter
                    else:
                        povFilter = 0.0
                else:
                    material_finish = DEF_MAT_NAME  # not working properly,
                    trans = 0.0

                ##############SF
                texturesDif = ""
                texturesSpec = ""
                texturesNorm = ""
                texturesAlpha = ""
                for t in material.texture_slots:
                    if t and t.texture.type == 'IMAGE' and t.use and t.texture.image:
                        image_filename = path_image(t.texture.image.filepath)
                        imgGamma = ""
                        if image_filename:
                            if t.use_map_color_diffuse:
                                texturesDif = image_filename
                                colvalue = t.default_value
                                t_dif = t
                                if t_dif.texture.pov.tex_gamma_enable:
                                    imgGamma = (" gamma %.3g " % t_dif.texture.pov.tex_gamma_value)
                            if t.use_map_specular or t.use_map_raymir:
                                texturesSpec = image_filename
                                colvalue = t.default_value
                                t_spec = t
                            if t.use_map_normal:
                                texturesNorm = image_filename
                                colvalue = t.normal_factor * 10.0
                                #textNormName=t.texture.image.name + ".normal"
                                #was the above used? --MR
                                t_nor = t
                            if t.use_map_alpha:
                                texturesAlpha = image_filename
                                colvalue = t.alpha_factor * 10.0
                                #textDispName=t.texture.image.name + ".displ"
                                #was the above used? --MR
                                t_alpha = t

                ####################################################################################

                if material.pov.replacement_text != "":
                    file.write("\n")
                    file.write(" texture{%s}\n" % material.pov.replacement_text)

                else:
                    file.write("\n")
                    # THIS AREA NEEDS TO LEAVE THE TEXTURE OPEN UNTIL ALL MAPS ARE WRITTEN DOWN.
                    # --MR
                    tabWrite("texture {\n")

                    ################################################################################
                    if material.diffuse_shader == 'MINNAERT':
                        tabWrite("\n")
                        tabWrite("aoi\n")
                        tabWrite("texture_map {\n")
                        tabWrite("[%.3g finish {diffuse %.3g}]\n" % \
                                 (material.darkness / 2.0, 2.0 - material.darkness))
                        tabWrite("[%.3g\n" % (1.0 - (material.darkness / 2.0)))

                    if material.diffuse_shader == 'FRESNEL':
                        # For FRESNEL diffuse in POV, we'll layer slope patterned textures
                        # with lamp vector as the slope vector and nest one slope per lamp
                        # into each texture map's entry.

                        c = 1
                        while (c <= lampCount):
                            tabWrite("slope { lampTarget%s }\n" % (c))
                            tabWrite("texture_map {\n")
                            # Diffuse Fresnel value and factor go up to five,
                            # other kind of values needed: used the number 5 below to remap
                            tabWrite("[%.3g finish {diffuse %.3g}]\n" % \
                                     ((5.0 - material.diffuse_fresnel) / 5,
                                      (material.diffuse_intensity *
                                       ((5.0 - material.diffuse_fresnel_factor) / 5))))
                            tabWrite("[%.3g\n" % ((material.diffuse_fresnel_factor / 5) *
                                                  (material.diffuse_fresnel / 5.0)))
                            c += 1

                    # if shader is a 'FRESNEL' or 'MINNAERT': slope pigment pattern or aoi
                    # and texture map above, the rest below as one of its entry

                    if texturesSpec != "" or texturesAlpha != "":
                        if texturesSpec != "":
                            # tabWrite("\n")
                            tabWrite("pigment_pattern {\n")
                            # POV-Ray "scale" is not a number of repetitions factor, but its
                            # inverse, a standard scale factor.
                            # Offset seems needed relatively to scale so probably center of the
                            # scale is not the same in blender and POV
                            mappingSpec = "translate <%.4g,%.4g,%.4g> scale <%.4g,%.4g,%.4g>\n" % \
                                          (-t_spec.offset.x, t_spec.offset.y, t_spec.offset.z,
                                           1.0 / t_spec.scale.x, 1.0 / t_spec.scale.y,
                                           1.0 / t_spec.scale.z)
                            tabWrite("uv_mapping image_map{%s \"%s\" %s}\n" % \
                                     (imageFormat(texturesSpec), texturesSpec, imgMap(t_spec)))
                            tabWrite("%s\n" % mappingSpec)
                            tabWrite("}\n")
                            tabWrite("texture_map {\n")
                            tabWrite("[0 \n")

                        if texturesDif == "":
                            if texturesAlpha != "":
                                tabWrite("\n")
                                # POV-Ray "scale" is not a number of repetitions factor, but its
                                # inverse, a standard scale factor.
                                # Offset seems needed relatively to scale so probably center of the
                                # scale is not the same in blender and POV
                                mappingAlpha = " translate <%.4g, %.4g, %.4g> " \
                                               "scale <%.4g, %.4g, %.4g>\n" % \
                                               (-t_alpha.offset.x, -t_alpha.offset.y,
                                                t_alpha.offset.z, 1.0 / t_alpha.scale.x,
                                                1.0 / t_alpha.scale.y, 1.0 / t_alpha.scale.z)
                                tabWrite("pigment {pigment_pattern {uv_mapping image_map" \
                                         "{%s \"%s\" %s}%s" % \
                                         (imageFormat(texturesAlpha), texturesAlpha,
                                          imgMap(t_alpha), mappingAlpha))
                                tabWrite("}\n")
                                tabWrite("pigment_map {\n")
                                tabWrite("[0 color rgbft<0,0,0,1,1>]\n")
                                tabWrite("[1 color rgbft<%.3g, %.3g, %.3g, %.3g, %.3g>]\n" % \
                                         (col[0], col[1], col[2], povFilter, trans))
                                tabWrite("}\n")
                                tabWrite("}\n")

                            else:

                                tabWrite("pigment {rgbft<%.3g, %.3g, %.3g, %.3g, %.3g>}\n" % \
                                         (col[0], col[1], col[2], povFilter, trans))

                            if texturesSpec != "":
                                # Level 1 is no specular
                                tabWrite("finish {%s}\n" % (safety(material_finish, Level=1)))

                            else:
                                # Level 2 is translated spec
                                tabWrite("finish {%s}\n" % (safety(material_finish, Level=2)))

                        else:
                            # POV-Ray "scale" is not a number of repetitions factor, but its
                            # inverse, a standard scale factor.
                            # Offset seems needed relatively to scale so probably center of the
                            # scale is not the same in blender and POV
                            mappingDif = ("translate <%.4g,%.4g,%.4g> scale <%.4g,%.4g,%.4g>" % \
                                          (-t_dif.offset.x, -t_dif.offset.y, t_dif.offset.z,
                                           1.0 / t_dif.scale.x, 1.0 / t_dif.scale.y,
                                           1.0 / t_dif.scale.z))
                            if texturesAlpha != "":
                                # POV-Ray "scale" is not a number of repetitions factor, but its
                                # inverse, a standard scale factor.
                                # Offset seems needed relatively to scale so probably center of the
                                # scale is not the same in blender and POV
                                mappingAlpha = " translate <%.4g,%.4g,%.4g> " \
                                               "scale <%.4g,%.4g,%.4g>" % \
                                               (-t_alpha.offset.x, -t_alpha.offset.y,
                                                t_alpha.offset.z, 1.0 / t_alpha.scale.x,
                                                1.0 / t_alpha.scale.y, 1.0 / t_alpha.scale.z)
                                tabWrite("pigment {\n")
                                tabWrite("pigment_pattern {\n")
                                tabWrite("uv_mapping image_map{%s \"%s\" %s}%s}\n" % \
                                         (imageFormat(texturesAlpha), texturesAlpha,
                                          imgMap(t_alpha), mappingAlpha))
                                tabWrite("pigment_map {\n")
                                tabWrite("[0 color rgbft<0,0,0,1,1>]\n")
                                tabWrite("[1 uv_mapping image_map {%s \"%s\" %s} %s]\n" % \
                                         (imageFormat(texturesDif), texturesDif,
                                          (imgGamma + imgMap(t_dif)), mappingDif))
                                tabWrite("}\n")
                                tabWrite("}\n")

                            else:
                                tabWrite("pigment {uv_mapping image_map {%s \"%s\" %s}%s}\n" % \
                                         (imageFormat(texturesDif), texturesDif,
                                          (imgGamma + imgMap(t_dif)), mappingDif))

                            if texturesSpec != "":
                                # Level 1 is no specular
                                tabWrite("finish {%s}\n" % (safety(material_finish, Level=1)))

                            else:
                                # Level 2 is translated specular
                                tabWrite("finish {%s}\n" % (safety(material_finish, Level=2)))

                            ## scale 1 rotate y*0
                            #imageMap = ("{image_map {%s \"%s\" %s }\n" % \
                            #            (imageFormat(textures),textures,imgMap(t_dif)))
                            #tabWrite("uv_mapping pigment %s} %s finish {%s}\n" % \
                            #         (imageMap,mapping,safety(material_finish)))
                            #tabWrite("pigment {uv_mapping image_map {%s \"%s\" %s}%s} " \
                            #         "finish {%s}\n" % \
                            #         (imageFormat(texturesDif), texturesDif, imgMap(t_dif),
                            #          mappingDif, safety(material_finish)))
                        if texturesNorm != "":
                            ## scale 1 rotate y*0
                            # POV-Ray "scale" is not a number of repetitions factor, but its
                            # inverse, a standard scale factor.
                            # Offset seems needed relatively to scale so probably center of the
                            # scale is not the same in blender and POV
                            mappingNor = " translate <%.4g,%.4g,%.4g> scale <%.4g,%.4g,%.4g>" % \
                                         (-t_nor.offset.x, -t_nor.offset.y, t_nor.offset.z,
                                          1.0 / t_nor.scale.x, 1.0 / t_nor.scale.y,
                                          1.0 / t_nor.scale.z)
                            #imageMapNor = ("{bump_map {%s \"%s\" %s mapping}" % \
                            #               (imageFormat(texturesNorm),texturesNorm,imgMap(t_nor)))
                            #We were not using the above maybe we should?
                            tabWrite("normal {uv_mapping bump_map " \
                                     "{%s \"%s\" %s  bump_size %.4g }%s}\n" % \
                                     (imageFormat(texturesNorm), texturesNorm, imgMap(t_nor),
                                      t_nor.normal_factor * 10, mappingNor))
                        if texturesSpec != "":
                            tabWrite("]\n")
                        ##################Second index for mapping specular max value###############
                            tabWrite("[1 \n")

                if texturesDif == "" and material.pov.replacement_text == "":
                    if texturesAlpha != "":
                        # POV-Ray "scale" is not a number of repetitions factor, but its inverse,
                        # a standard scale factor.
                        # Offset seems needed relatively to scale so probably center of the scale
                        # is not the same in blender and POV
                        # Strange that the translation factor for scale is not the same as for
                        # translate.
                        # TODO: verify both matches with blender internal.
                        mappingAlpha = " translate <%.4g,%.4g,%.4g> scale <%.4g,%.4g,%.4g>\n" % \
                                       (-t_alpha.offset.x, -t_alpha.offset.y, t_alpha.offset.z,
                                        1.0 / t_alpha.scale.x, 1.0 / t_alpha.scale.y,
                                        1.0 / t_alpha.scale.z)
                        tabWrite("pigment {pigment_pattern {uv_mapping image_map" \
                                 "{%s \"%s\" %s}%s}\n" % \
                                 (imageFormat(texturesAlpha), texturesAlpha, imgMap(t_alpha),
                                  mappingAlpha))
                        tabWrite("pigment_map {\n")
                        tabWrite("[0 color rgbft<0,0,0,1,1>]\n")
                        tabWrite("[1 color rgbft<%.3g, %.3g, %.3g, %.3g, %.3g>]\n" % \
                                 (col[0], col[1], col[2], povFilter, trans))
                        tabWrite("}\n")
                        tabWrite("}\n")

                    else:
                        tabWrite("pigment {rgbft<%.3g, %.3g, %.3g, %.3g, %.3g>}\n" % \
                                 (col[0], col[1], col[2], povFilter, trans))

                    if texturesSpec != "":
                        # Level 3 is full specular
                        tabWrite("finish {%s}\n" % (safety(material_finish, Level=3)))

                    else:
                        # Level 2 is translated specular
                        tabWrite("finish {%s}\n" % (safety(material_finish, Level=2)))

                elif material.pov.replacement_text == "":
                    # POV-Ray "scale" is not a number of repetitions factor, but its inverse,
                    # a standard scale factor.
                    # Offset seems needed relatively to scale so probably center of the scale is
                    # not the same in blender and POV
                    # Strange that the translation factor for scale is not the same as for
                    # translate.
                    # TODO: verify both matches with blender internal.
                    mappingDif = ("translate <%.4g,%.4g,%.4g> scale <%.4g,%.4g,%.4g>" % \
                                  (-t_dif.offset.x, -t_dif.offset.y, t_dif.offset.z,
                                   1.0 / t_dif.scale.x, 1.0 / t_dif.scale.y, 1.0 / t_dif.scale.z))
                    if texturesAlpha != "":
                        # Strange that the translation factor for scale is not the same as for
                        # translate.
                        # TODO: verify both matches with blender internal.
                        mappingAlpha = "translate <%.4g,%.4g,%.4g> scale <%.4g,%.4g,%.4g>" % \
                                       (-t_alpha.offset.x, -t_alpha.offset.y, t_alpha.offset.z,
                                        1.0 / t_alpha.scale.x, 1.0 / t_alpha.scale.y,
                                        1.0 / t_alpha.scale.z)
                        tabWrite("pigment {pigment_pattern {uv_mapping image_map" \
                                 "{%s \"%s\" %s}%s}\n" % \
                                 (imageFormat(texturesAlpha), texturesAlpha, imgMap(t_alpha),
                                  mappingAlpha))
                        tabWrite("pigment_map {\n")
                        tabWrite("[0 color rgbft<0,0,0,1,1>]\n")
                        tabWrite("[1 uv_mapping image_map {%s \"%s\" %s} %s]\n" % \
                                 (imageFormat(texturesDif), texturesDif,
                                  (imgMap(t_dif) + imgGamma), mappingDif))
                        tabWrite("}\n")
                        tabWrite("}\n")

                    else:
                        tabWrite("pigment {\n")
                        tabWrite("uv_mapping image_map {\n")
                        #tabWrite("%s \"%s\" %s}%s\n" % \
                        #         (imageFormat(texturesDif), texturesDif,
                        #         (imgGamma + imgMap(t_dif)),mappingDif))
                        tabWrite("%s \"%s\" \n" % (imageFormat(texturesDif), texturesDif))
                        tabWrite("%s\n" % (imgGamma + imgMap(t_dif)))
                        tabWrite("}\n")
                        tabWrite("%s\n" % mappingDif)
                        tabWrite("}\n")
                    if texturesSpec != "":
                        # Level 3 is full specular
                        tabWrite("finish {%s}\n" % (safety(material_finish, Level=3)))
                    else:
                        # Level 2 is translated specular
                        tabWrite("finish {%s}\n" % (safety(material_finish, Level=2)))

                    ## scale 1 rotate y*0
                    #imageMap = ("{image_map {%s \"%s\" %s }" % \
                    #            (imageFormat(textures), textures,imgMap(t_dif)))
                    #file.write("\n\t\t\tuv_mapping pigment %s} %s finish {%s}" % \
                    #           (imageMap, mapping, safety(material_finish)))
                    #file.write("\n\t\t\tpigment {uv_mapping image_map " \
                    #           "{%s \"%s\" %s}%s} finish {%s}" % \
                    #           (imageFormat(texturesDif), texturesDif,imgMap(t_dif),
                    #            mappingDif, safety(material_finish)))
                if texturesNorm != "" and material.pov.replacement_text == "":
                    ## scale 1 rotate y*0
                    # POV-Ray "scale" is not a number of repetitions factor, but its inverse,
                    # a standard scale factor.
                    # Offset seems needed relatively to scale so probably center of the scale is
                    # not the same in blender and POV
                    mappingNor = (" translate <%.4g,%.4g,%.4g> scale <%.4g,%.4g,%.4g>" % \
                                  (-t_nor.offset.x, -t_nor.offset.y, t_nor.offset.z,
                                   1.0 / t_nor.scale.x, 1.0 / t_nor.scale.y, 1.0 / t_nor.scale.z))
                    #imageMapNor = ("{bump_map {%s \"%s\" %s mapping}" % \
                    #               (imageFormat(texturesNorm),texturesNorm,imgMap(t_nor)))
                    #We were not using the above maybe we should?
                    tabWrite("normal {uv_mapping bump_map {%s \"%s\" %s  bump_size %.4g }%s}\n" % \
                             (imageFormat(texturesNorm), texturesNorm, imgMap(t_nor),
                              t_nor.normal_factor * 10.0, mappingNor))
                if texturesSpec != "" and material.pov.replacement_text == "":
                    tabWrite("]\n")

                    tabWrite("}\n")

                #End of slope/ior texture_map
                if material.diffuse_shader == 'MINNAERT' and material.pov.replacement_text == "":
                    tabWrite("]\n")
                    tabWrite("}\n")
                if material.diffuse_shader == 'FRESNEL' and material.pov.replacement_text == "":
                    c = 1
                    while (c <= lampCount):
                        tabWrite("]\n")
                        tabWrite("}\n")
                        c += 1

                if material.pov.replacement_text == "":
                    tabWrite("}\n")  # THEN IT CAN CLOSE IT   --MR

                ####################################################################################
                index[0] = idx
                idx += 1

            tabWrite("}\n")

            # Face indices
            tabWrite("face_indices {\n")
            tabWrite("%d" % (len(me_faces) + quadCount))  # faces count
            tabStr = tab * tabLevel

            for fi, f in enumerate(me_faces):
                fv = faces_verts[fi]
                material_index = f.material_index
                if len(fv) == 4:
                    indices = (0, 1, 2), (0, 2, 3)
                else:
                    indices = ((0, 1, 2),)

                if vcol_layer:
                    col = vcol_layer[fi]

                    if len(fv) == 4:
                        cols = col.color1, col.color2, col.color3, col.color4
                    else:
                        cols = col.color1, col.color2, col.color3

                if not me_materials or me_materials[material_index] is None:  # No materials
                    for i1, i2, i3 in indices:
                        if not scene.pov.tempfiles_enable and scene.pov.list_lf_enable:
                            file.write(",\n")
                            # vert count
                            file.write(tabStr + "<%d,%d,%d>" % (fv[i1], fv[i2], fv[i3]))
                        else:
                            file.write(", ")
                            file.write("<%d,%d,%d>" % (fv[i1], fv[i2], fv[i3]))  # vert count
                else:
                    material = me_materials[material_index]
                    for i1, i2, i3 in indices:
                        if me.vertex_colors and material.use_vertex_color_paint:
                            # Colour per vertex - vertex colour

                            col1 = cols[i1]
                            col2 = cols[i2]
                            col3 = cols[i3]

                            ci1 = vertCols[col1[0], col1[1], col1[2], material_index][0]
                            ci2 = vertCols[col2[0], col2[1], col2[2], material_index][0]
                            ci3 = vertCols[col3[0], col3[1], col3[2], material_index][0]
                        else:
                            # Colour per material - flat material colour
                            diffuse_color = material.diffuse_color
                            ci1 = ci2 = ci3 = vertCols[diffuse_color[0], diffuse_color[1], \
                                              diffuse_color[2], f.material_index][0]

                        if not scene.pov.tempfiles_enable and scene.pov.list_lf_enable:
                            file.write(",\n")
                            file.write(tabStr + "<%d,%d,%d>, %d,%d,%d" % \
                                       (fv[i1], fv[i2], fv[i3], ci1, ci2, ci3))  # vert count
                        else:
                            file.write(", ")
                            file.write("<%d,%d,%d>, %d,%d,%d" % \
                                       (fv[i1], fv[i2], fv[i3], ci1, ci2, ci3))  # vert count

            file.write("\n")
            tabWrite("}\n")

            # normal_indices indices
            tabWrite("normal_indices {\n")
            tabWrite("%d" % (len(me_faces) + quadCount))  # faces count
            tabStr = tab * tabLevel
            for fi, fv in enumerate(faces_verts):

                if len(fv) == 4:
                    indices = (0, 1, 2), (0, 2, 3)
                else:
                    indices = ((0, 1, 2),)

                for i1, i2, i3 in indices:
                    if me_faces[fi].use_smooth:
                        if not scene.pov.tempfiles_enable and scene.pov.list_lf_enable:
                            file.write(",\n")
                            file.write(tabStr + "<%d,%d,%d>" %\
                            (uniqueNormals[verts_normals[fv[i1]]][0],\
                             uniqueNormals[verts_normals[fv[i2]]][0],\
                             uniqueNormals[verts_normals[fv[i3]]][0]))  # vert count
                        else:
                            file.write(", ")
                            file.write("<%d,%d,%d>" %\
                            (uniqueNormals[verts_normals[fv[i1]]][0],\
                             uniqueNormals[verts_normals[fv[i2]]][0],\
                             uniqueNormals[verts_normals[fv[i3]]][0]))  # vert count
                    else:
                        idx = uniqueNormals[faces_normals[fi]][0]
                        if not scene.pov.tempfiles_enable and scene.pov.list_lf_enable:
                            file.write(",\n")
                            file.write(tabStr + "<%d,%d,%d>" % (idx, idx, idx))  # vert count
                        else:
                            file.write(", ")
                            file.write("<%d,%d,%d>" % (idx, idx, idx))  # vert count

            file.write("\n")
            tabWrite("}\n")

            if uv_layer:
                tabWrite("uv_indices {\n")
                tabWrite("%d" % (len(me_faces) + quadCount))  # faces count
                tabStr = tab * tabLevel
                for fi, fv in enumerate(faces_verts):

                    if len(fv) == 4:
                        indices = (0, 1, 2), (0, 2, 3)
                    else:
                        indices = ((0, 1, 2),)

                    uv = uv_layer[fi]
                    if len(faces_verts[fi]) == 4:
                        uvs = uv.uv1[:], uv.uv2[:], uv.uv3[:], uv.uv4[:]
                    else:
                        uvs = uv.uv1[:], uv.uv2[:], uv.uv3[:]

                    for i1, i2, i3 in indices:
                        if not scene.pov.tempfiles_enable and scene.pov.list_lf_enable:
                            file.write(",\n")
                            file.write(tabStr + "<%d,%d,%d>" % (
                                     uniqueUVs[uvs[i1]][0],\
                                     uniqueUVs[uvs[i2]][0],\
                                     uniqueUVs[uvs[i3]][0]))
                        else:
                            file.write(", ")
                            file.write("<%d,%d,%d>" % (
                                     uniqueUVs[uvs[i1]][0],\
                                     uniqueUVs[uvs[i2]][0],\
                                     uniqueUVs[uvs[i3]][0]))

                file.write("\n")
                tabWrite("}\n")

            if me.materials:
                try:
                    material = me.materials[0]  # dodgy
                    writeObjectMaterial(material, ob)
                except IndexError:
                    print(me)

            #Importance for radiosity sampling added here:
            tabWrite("radiosity { \n")
            tabWrite("importance %3g \n" % importance)
            tabWrite("}\n")

            tabWrite("}\n")  # End of mesh block

            bpy.data.meshes.remove(me)

        for data_name, inst in data_ref.items():
            for ob_name, matrix_str in inst:
                tabWrite("//----Blender Object Name:%s----\n" % ob_name)
                tabWrite("object { \n")
                tabWrite("%s\n" % data_name)
                tabWrite("%s\n" % matrix_str)
                tabWrite("}\n")

    def exportWorld(world):
        render = scene.render
        camera = scene.camera
        matrix = global_matrix * camera.matrix_world
        if not world:
            return
        #############Maurice####################################
        #These lines added to get sky gradient (visible with PNG output)
        if world:
            #For simple flat background:
            if not world.use_sky_blend:
                # Non fully transparent background could premultiply alpha and avoid anti-aliasing
                # display issue:
                if render.alpha_mode == 'PREMUL':
                    tabWrite("background {rgbt<%.3g, %.3g, %.3g, 0.75>}\n" % \
                             (world.horizon_color[:]))
                #Currently using no alpha with Sky option:
                elif render.alpha_mode == 'SKY':
                    tabWrite("background {rgbt<%.3g, %.3g, %.3g, 0>}\n" % (world.horizon_color[:]))
                #StraightAlpha:
                else:
                    tabWrite("background {rgbt<%.3g, %.3g, %.3g, 1>}\n" % (world.horizon_color[:]))

            worldTexCount = 0
            #For Background image textures
            for t in world.texture_slots:  # risk to write several sky_spheres but maybe ok.
                if t and t.texture.type is not None:
                    worldTexCount += 1
                # XXX No enable checkbox for world textures yet (report it?)
                #if t and t.texture.type == 'IMAGE' and t.use:
                if t and t.texture.type == 'IMAGE':
                    image_filename = path_image(t.texture.image.filepath)
                    if t.texture.image.filepath != image_filename:
                        t.texture.image.filepath = image_filename
                    if image_filename != "" and t.use_map_blend:
                        texturesBlend = image_filename
                        #colvalue = t.default_value
                        t_blend = t

                    # Commented below was an idea to make the Background image oriented as camera
                    # taken here:
#http://news.povray.org/povray.newusers/thread/%3Cweb.4a5cddf4e9c9822ba2f93e20@news.povray.org%3E/
                    # Replace 4/3 by the ratio of each image found by some custom or existing
                    # function
                    #mappingBlend = (" translate <%.4g,%.4g,%.4g> rotate z*degrees" \
                    #                "(atan((camLocation - camLookAt).x/(camLocation - " \
                    #                "camLookAt).y)) rotate x*degrees(atan((camLocation - " \
                    #                "camLookAt).y/(camLocation - camLookAt).z)) rotate y*" \
                    #                "degrees(atan((camLocation - camLookAt).z/(camLocation - " \
                    #                "camLookAt).x)) scale <%.4g,%.4g,%.4g>b" % \
                    #                (t_blend.offset.x / 10 , t_blend.offset.y / 10 ,
                    #                 t_blend.offset.z / 10, t_blend.scale.x ,
                    #                 t_blend.scale.y , t_blend.scale.z))
                    #using camera rotation valuesdirectly from blender seems much easier
                    if t_blend.texture_coords == 'ANGMAP':
                        mappingBlend = ""
                    else:
                        mappingBlend = " translate <%.4g-0.5,%.4g-0.5,%.4g-0.5> rotate<0,0,0>  " \
                                       "scale <%.4g,%.4g,%.4g>" % \
                                       (t_blend.offset.x / 10.0, t_blend.offset.y / 10.0,
                                        t_blend.offset.z / 10.0, t_blend.scale.x * 0.85,
                                        t_blend.scale.y * 0.85, t_blend.scale.z * 0.85)

                        # The initial position and rotation of the pov camera is probably creating
                        # the rotation offset should look into it someday but at least background
                        # won't rotate with the camera now.
                    # Putting the map on a plane would not introduce the skysphere distortion and
                    # allow for better image scale matching but also some waay to chose depth and
                    # size of the plane relative to camera.
                    tabWrite("sky_sphere {\n")
                    tabWrite("pigment {\n")
                    tabWrite("image_map{%s \"%s\" %s}\n" % \
                             (imageFormat(texturesBlend), texturesBlend, imgMapBG(t_blend)))
                    tabWrite("}\n")
                    tabWrite("%s\n" % (mappingBlend))
                    # The following layered pigment opacifies to black over the texture for
                    # transmit below 1 or otherwise adds to itself
                    tabWrite("pigment {rgb 0 transmit %s}\n" % (t.texture.intensity))
                    tabWrite("}\n")
                    #tabWrite("scale 2\n")
                    #tabWrite("translate -1\n")

            #For only Background gradient

            if worldTexCount == 0:
                if world.use_sky_blend:
                    tabWrite("sky_sphere {\n")
                    tabWrite("pigment {\n")
                    # maybe Should follow the advice of POV doc about replacing gradient
                    # for skysphere..5.5
                    tabWrite("gradient y\n")
                    tabWrite("color_map {\n")
                    if render.alpha_mode == 'STRAIGHT':
                        tabWrite("[0.0 rgbt<%.3g, %.3g, %.3g, 1>]\n" % (world.horizon_color[:]))
                        tabWrite("[1.0 rgbt<%.3g, %.3g, %.3g, 1>]\n" % (world.zenith_color[:]))
                    elif render.alpha_mode == 'PREMUL':
                        tabWrite("[0.0 rgbt<%.3g, %.3g, %.3g, 0.99>]\n" % (world.horizon_color[:]))
                        # aa premult not solved with transmit 1
                        tabWrite("[1.0 rgbt<%.3g, %.3g, %.3g, 0.99>]\n" % (world.zenith_color[:]))
                    else:
                        tabWrite("[0.0 rgbt<%.3g, %.3g, %.3g, 0>]\n" % (world.horizon_color[:]))
                        tabWrite("[1.0 rgbt<%.3g, %.3g, %.3g, 0>]\n" % (world.zenith_color[:]))
                    tabWrite("}\n")
                    tabWrite("}\n")
                    tabWrite("}\n")
                    # Sky_sphere alpha (transmit) is not translating into image alpha the same
                    # way as 'background'

            #if world.light_settings.use_indirect_light:
            #    scene.pov.radio_enable=1

            # Maybe change the above to a funtion copyInternalRenderer settings when
            # user pushes a button, then:
            #scene.pov.radio_enable = world.light_settings.use_indirect_light
            # and other such translations but maybe this would not be allowed either?

        ###############################################################

        mist = world.mist_settings

        if mist.use_mist:
            tabWrite("fog {\n")
            tabWrite("distance %.6f\n" % mist.depth)
            tabWrite("color rgbt<%.3g, %.3g, %.3g, %.3g>\n" % \
                     (world.horizon_color[:] + (1.0 - mist.intensity,)))
            #tabWrite("fog_offset %.6f\n" % mist.start)
            #tabWrite("fog_alt 5\n")
            #tabWrite("turbulence 0.2\n")
            #tabWrite("turb_depth 0.3\n")
            tabWrite("fog_type 1\n")
            tabWrite("}\n")
        if scene.pov.media_enable:
            tabWrite("media {\n")
            tabWrite("scattering { 1, rgb <%.4g, %.4g, %.4g>}\n" % scene.pov.media_color[:])
            tabWrite("samples %.d\n" % scene.pov.media_samples)
            tabWrite("}\n")

    def exportGlobalSettings(scene):

        tabWrite("global_settings {\n")
        tabWrite("assumed_gamma 1.0\n")
        tabWrite("max_trace_level %d\n" % scene.pov.max_trace_level)

        if scene.pov.radio_enable:
            tabWrite("radiosity {\n")
            tabWrite("adc_bailout %.4g\n" % scene.pov.radio_adc_bailout)
            tabWrite("always_sample %d\n" % scene.pov.radio_always_sample)
            tabWrite("brightness %.4g\n" % scene.pov.radio_brightness)
            tabWrite("count %d\n" % scene.pov.radio_count)
            tabWrite("error_bound %.4g\n" % scene.pov.radio_error_bound)
            tabWrite("gray_threshold %.4g\n" % scene.pov.radio_gray_threshold)
            tabWrite("low_error_factor %.4g\n" % scene.pov.radio_low_error_factor)
            tabWrite("media %d\n" % scene.pov.radio_media)
            tabWrite("minimum_reuse %.4g\n" % scene.pov.radio_minimum_reuse)
            tabWrite("nearest_count %d\n" % scene.pov.radio_nearest_count)
            tabWrite("normal %d\n" % scene.pov.radio_normal)
            tabWrite("pretrace_start %.3g\n" % scene.pov.radio_pretrace_start)
            tabWrite("pretrace_end %.3g\n" % scene.pov.radio_pretrace_end)
            tabWrite("recursion_limit %d\n" % scene.pov.radio_recursion_limit)
            tabWrite("}\n")
        onceSss = 1
        onceAmbient = 1
        oncePhotons = 1
        for material in bpy.data.materials:
            if material.subsurface_scattering.use and onceSss:
                # In pov, the scale has reversed influence compared to blender. these number
                # should correct that
                tabWrite("mm_per_unit %.6f\n" % \
                         (material.subsurface_scattering.scale * (-100.0) + 15.0))
                # In POV-Ray, the scale factor for all subsurface shaders needs to be the same
                onceSss = 0

            if world and onceAmbient:
                tabWrite("ambient_light rgb<%.3g, %.3g, %.3g>\n" % world.ambient_color[:])
                onceAmbient = 0

            if (material.pov.photons_refraction or material.pov.photons_reflection)and oncePhotons:
                tabWrite("photons {\n")
                tabWrite("spacing %.6f\n" % scene.pov.photon_spacing)
                tabWrite("max_trace_level %d\n" % scene.pov.photon_max_trace_level)
                tabWrite("adc_bailout %.3g\n" % scene.pov.photon_adc_bailout)
                tabWrite("gather %d, %d\n" % (scene.pov.photon_gather_min, scene.pov.photon_gather_max))
                tabWrite("}\n")
                oncePhotons = 0

        tabWrite("}\n")

    def exportCustomCode():

        for txt in bpy.data.texts:
            if txt.pov.custom_code:
                # Why are the newlines needed?
                file.write("\n")
                file.write(txt.as_string())
                file.write("\n")

    sel = renderable_objects(scene)
    comments = scene.pov.comments_enable
    if not scene.pov.tempfiles_enable and comments:
        file.write("//----------------------------------------------\n" \
                   "//--Exported with POV-Ray exporter for Blender--\n" \
                   "//----------------------------------------------\n\n")
    file.write("#version 3.7;\n")

    if not scene.pov.tempfiles_enable and comments:
        file.write("\n//--CUSTOM CODE--\n\n")
    exportCustomCode()

    if not scene.pov.tempfiles_enable and comments:
        file.write("\n//--Global settings and background--\n\n")

    exportGlobalSettings(scene)

    if not scene.pov.tempfiles_enable and comments:
        file.write("\n")

    exportWorld(scene.world)

    if not scene.pov.tempfiles_enable and comments:
        file.write("\n//--Cameras--\n\n")

    exportCamera()

    if not scene.pov.tempfiles_enable and comments:
        file.write("\n//--Lamps--\n\n")

    exportLamps([l for l in sel if l.type == 'LAMP'])

    if not scene.pov.tempfiles_enable and comments:
        file.write("\n//--Material Definitions--\n\n")

    # Convert all materials to strings we can access directly per vertex.
    #exportMaterials()
    writeMaterial(None)  # default material
    for material in bpy.data.materials:
        if material.users > 0:
            writeMaterial(material)
    if not scene.pov.tempfiles_enable and comments:
        file.write("\n")

    exportMeta([l for l in sel if l.type == 'META'])

    if not scene.pov.tempfiles_enable and comments:
        file.write("//--Mesh objects--\n")

    exportMeshes(scene, sel)
    #What follow used to happen here:
    #exportCamera()
    #exportWorld(scene.world)
    #exportGlobalSettings(scene)
    # MR:..and the order was important for an attempt to implement pov 3.7 baking
    #      (mesh camera) comment for the record
    # CR: Baking should be a special case than. If "baking", than we could change the order.

    #print("pov file closed %s" % file.closed)
    file.close()
    #print("pov file closed %s" % file.closed)


def write_pov_ini(scene, filename_ini, filename_pov, filename_image):
    #scene = bpy.data.scenes[0]
    render = scene.render

    x = int(render.resolution_x * render.resolution_percentage * 0.01)
    y = int(render.resolution_y * render.resolution_percentage * 0.01)

    file = open(filename_ini, "w")
    file.write("Version=3.7\n")
    file.write("Input_File_Name='%s'\n" % filename_pov)
    file.write("Output_File_Name='%s'\n" % filename_image)

    file.write("Width=%d\n" % x)
    file.write("Height=%d\n" % y)

    # Border render.
    if render.use_border:
        file.write("Start_Column=%4g\n" % render.border_min_x)
        file.write("End_Column=%4g\n" % (render.border_max_x))

        file.write("Start_Row=%4g\n" % (1.0 - render.border_max_y))
        file.write("End_Row=%4g\n" % (1.0 - render.border_min_y))

    file.write("Bounding_Method=2\n")  # The new automatic BSP is faster in most scenes

    # Activated (turn this back off when better live exchange is done between the two programs
    # (see next comment)
    file.write("Display=1\n")
    file.write("Pause_When_Done=0\n")
    # PNG, with POV-Ray 3.7, can show background color with alpha. In the long run using the
    # POV-Ray interactive preview like bishop 3D could solve the preview for all formats.
    file.write("Output_File_Type=N\n")
    #file.write("Output_File_Type=T\n") # TGA, best progressive loading
    file.write("Output_Alpha=1\n")

    if scene.pov.antialias_enable:
        # method 2 (recursive) with higher max subdiv forced because no mipmapping in POV-Ray
        # needs higher sampling.
        # aa_mapping = {"5": 2, "8": 3, "11": 4, "16": 5}
        method = {"0": 1, "1": 2}
        file.write("Antialias=on\n")
        file.write("Sampling_Method=%s\n" % method[scene.pov.antialias_method])
        file.write("Antialias_Depth=%d\n" % scene.pov.antialias_depth)
        file.write("Antialias_Threshold=%.3g\n" % scene.pov.antialias_threshold)
        file.write("Antialias_Gamma=%.3g\n" % scene.pov.antialias_gamma)
        if scene.pov.jitter_enable:
            file.write("Jitter=on\n")
            file.write("Jitter_Amount=%3g\n" % scene.pov.jitter_amount)
        else:
            file.write("Jitter=off\n")  # prevent animation flicker

    else:
        file.write("Antialias=off\n")
    #print("ini file closed %s" % file.closed)
    file.close()
    #print("ini file closed %s" % file.closed)


class PovrayRender(bpy.types.RenderEngine):
    bl_idname = 'POVRAY_RENDER'
    bl_label = "POV-Ray 3.7"
    DELAY = 0.5

    def _export(self, scene, povPath, renderImagePath):
        import tempfile

        if scene.pov.tempfiles_enable:
            self._temp_file_in = tempfile.NamedTemporaryFile(suffix=".pov", delete=False).name
            # PNG with POV 3.7, can show the background color with alpha. In the long run using the
            # POV-Ray interactive preview like bishop 3D could solve the preview for all formats.
            self._temp_file_out = tempfile.NamedTemporaryFile(suffix=".png", delete=False).name
            #self._temp_file_out = tempfile.NamedTemporaryFile(suffix=".tga", delete=False).name
            self._temp_file_ini = tempfile.NamedTemporaryFile(suffix=".ini", delete=False).name
        else:
            self._temp_file_in = povPath + ".pov"
            # PNG with POV 3.7, can show the background color with alpha. In the long run using the
            # POV-Ray interactive preview like bishop 3D could solve the preview for all formats.
            self._temp_file_out = renderImagePath + ".png"
            #self._temp_file_out = renderImagePath + ".tga"
            self._temp_file_ini = povPath + ".ini"
            '''
            self._temp_file_in = "/test.pov"
            # PNG with POV 3.7, can show the background color with alpha. In the long run using the
            # POV-Ray interactive preview like bishop 3D could solve the preview for all formats.
            self._temp_file_out = "/test.png"
            #self._temp_file_out = "/test.tga"
            self._temp_file_ini = "/test.ini"
            '''

        def info_callback(txt):
            self.update_stats("", "POV-Ray 3.7: " + txt)

        write_pov(self._temp_file_in, scene, info_callback)

    def _render(self, scene):

        try:
            os.remove(self._temp_file_out)  # so as not to load the old file
        except OSError:
            pass

        write_pov_ini(scene, self._temp_file_ini, self._temp_file_in, self._temp_file_out)

        print ("***-STARTING-***")

        pov_binary = "povray"

        extra_args = []

        if scene.pov.command_line_switches != "":
            for newArg in scene.pov.command_line_switches.split(" "):
                extra_args.append(newArg)

        self._is_windows = False
        if sys.platform[:3] == "win":
            self._is_windows = True
            #extra_args.append("/EXIT")

            import winreg
            import platform as pltfrm
            if pltfrm.architecture()[0] == "64bit":
                bitness = 64
            else:
                bitness = 32

            regKey = winreg.OpenKey(winreg.HKEY_CURRENT_USER, "Software\\POV-Ray\\v3.7\\Windows")

            # TODO, report api

            # 64 bits blender
            if bitness == 64:
                try:
                    pov_binary = winreg.QueryValueEx(regKey, "Home")[0] + "\\bin\\pvengine64"
                    self._process = subprocess.Popen(
                            [pov_binary, self._temp_file_ini] + extra_args,
                            stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
                    # This would work too but means we have to wait until its done:
                    # os.system("%s %s" % (pov_binary, self._temp_file_ini))

                except OSError:
                    # someone might run povray 32 bits on a 64 bits blender machine
                    try:
                        pov_binary = winreg.QueryValueEx(regKey, "Home")[0] + "\\bin\\pvengine"
                        self._process = subprocess.Popen(
                                [pov_binary, self._temp_file_ini] + extra_args,
                                stdout=subprocess.PIPE, stderr=subprocess.STDOUT)

                    except OSError:
                        # TODO, report api
                        print("POV-Ray 3.7: could not execute '%s', possibly POV-Ray isn't " \
                              "installed" % pov_binary)
                        import traceback
                        traceback.print_exc()
                        print ("***-DONE-***")
                        return False

                    else:
                        print("POV-Ray 3.7 64 bits could not execute, running 32 bits instead")
                        print("Command line arguments passed: " + str(extra_args))
                        return True

                else:
                    print("POV-Ray 3.7 64 bits found")
                    print("Command line arguments passed: " + str(extra_args))
                    return True

            #32 bits blender
            else:
                try:
                    pov_binary = winreg.QueryValueEx(regKey, "Home")[0] + "\\bin\\pvengine"
                    self._process = subprocess.Popen(
                            [pov_binary, self._temp_file_ini] + extra_args,
                            stdout=subprocess.PIPE, stderr=subprocess.STDOUT)

                # someone might also run povray 64 bits with a 32 bits build of blender.
                except OSError:
                    try:
                        pov_binary = winreg.QueryValueEx(regKey, "Home")[0] + "\\bin\\pvengine64"
                        self._process = subprocess.Popen(
                                [pov_binary, self._temp_file_ini] + extra_args,
                                stdout=subprocess.PIPE, stderr=subprocess.STDOUT)

                    except OSError:
                        # TODO, report api
                        print("POV-Ray 3.7: could not execute '%s', possibly POV-Ray isn't " \
                              "installed" % pov_binary)
                        import traceback