__init__.py

                name="Coordinates",
                description="Texture coordinates used to map the texture onto the background",
                items=(("VIEW", "View", "Use view vector for the texture coordinates"),
                       ("GLOBAL", "Global", "Use global coordinates for the texture coordinates (interior mist)"),
                       ("ANGMAP", "AngMap", "Use 360 degree angular coordinates, e.g. for spherical light probes"),
                       ("SPHERE", "Sphere", "For 360 degree panorama sky, spherical mapped, only top half"),
                       ("EQUIRECT", "Equirectangular", "For 360 degree panorama sky, equirectangular mapping"),
                       ("TUBE", "Tube", "For 360 degree panorama sky, cylindrical mapped, only top half"),
                       ("OBJECT", "Object", "Use linked object’s coordinates for texture coordinates")),
                default="VIEW")

    use_map_blend: BoolProperty(
                name="Blend Map", description="Affect the color progression of the background",
                default=True)

    use_map_horizon: BoolProperty(
                name="Horizon Map", description="Affect the color of the horizon",
                default=False)

    use_map_zenith_down: BoolProperty(
                name="", description="Affect the color of the zenith below",
                default=False)

    use_map_zenith_up: BoolProperty(
                name="Zenith Up Map", description="Affect the color of the zenith above",
                default=False)

    zenith_down_factor: FloatProperty(
                name="Zenith Down",
                description="Amount texture affects color of the zenith below",
                soft_min=0.0, soft_max=1.0, default=1.0)

    zenith_up_factor: FloatProperty(
                name="Zenith Up",
                description="Amount texture affects color of the zenith above",
                soft_min=0.0, soft_max=1.0, default=1.0)

                
# former Space properties from  removed Blender Internal added below at superclass level 
# so as to be available in World, Material, Light for texture slots use  

bpy.types.ID.use_limited_texture_context = BoolProperty(
        name="",
        description="Use the limited version of texture user (for ‘old shading’ mode)",
        default=True)
bpy.types.ID.texture_context = EnumProperty(
        name="Texture context",
        description="Type of texture data to display and edit",
        items=(('MATERIAL', "", "Show material textures", "MATERIAL",0), #"Show material textures"
               ('WORLD', "", "Show world textures", "WORLD",1), #"Show world textures"
               ('LIGHT', "", "Show lamp textures", "LIGHT",2), #"Show lamp textures"
               ('PARTICLES', "", "Show particles textures", "PARTICLES",3), #"Show particles textures"
               ('LINESTYLE', "", "Show linestyle textures", "LINE_DATA",4), #"Show linestyle textures"
               ('OTHER', "", "Show other data textures", "TEXTURE_DATA",5)), #"Show other data textures"
        default = 'MATERIAL')

bpy.types.ID.active_texture_index = IntProperty(
        name = "Index for texture_slots",
        default = 0)
                
class RenderPovSettingsMaterial(PropertyGroup):
    """Declare material level properties controllable in UI and translated to POV."""
    ######################Begin Old Blender Internal Props#########################
    #former Space properties from  removed Blender Internal
    use_limited_texture_context: BoolProperty(
            name="",
            description="Use the limited version of texture user (for ‘old shading’ mode)",
            default=True)
    texture_context: EnumProperty(
            name="Texture context",
            description="Type of texture data to display and edit",
            items=(('MATERIAL', "", "Show material textures", "MATERIAL",0), #"Show material textures"
                   ('WORLD', "", "Show world textures", "WORLD",1), #"Show world textures"
                   ('LAMP', "", "Show lamp textures", "LIGHT",2), #"Show lamp textures"
                   ('PARTICLES', "", "Show particles textures", "PARTICLES",3), #"Show particles textures"
                   ('LINESTYLE', "", "Show linestyle textures", "LINE_DATA",4), #"Show linestyle textures"
                   ('OTHER', "", "Show other data textures", "TEXTURE_DATA",5)), #"Show other data textures"
            default = 'MATERIAL')
 
    active_texture_index: IntProperty(
            name = "Index for texture_slots",
            default = 0)
            
    transparency_method: EnumProperty(
            name="Specular Shader Model",
            description="Method to use for rendering transparency",   
            items=(("MASK", "Mask", "Mask the background"),
                   ("Z_TRANSPARENCY", "Z Transparency", "Use alpha buffer for transparent faces"),
                   ("RAYTRACE", "Raytrace", "Use raytracing for transparent refraction rendering")),
            default="MASK")
            
    use_transparency: BoolProperty(
            name="Transparency", description="Render material as transparent",
            default=False)

    alpha: FloatProperty(
            name="Alpha",
            description="Alpha transparency of the material",
            min=0.0, max=1.0, soft_min=0.0, soft_max=1.0, default=1.0, precision=3)

    specular_alpha: FloatProperty(
            name="Specular alpha",
            description="Alpha transparency for specular areas",
            min=0.0, max=1.0, soft_min=0.0, soft_max=1.0, default=1.0, precision=3)
            
    ambient: FloatProperty(
            name="Ambient",
            description="Amount of global ambient color the material receives",
            min=0.0, max=1.0, soft_min=0.0, soft_max=1.0, default=1.0, precision=3)

    diffuse_color: FloatVectorProperty(
            name="Diffuse color",
            description=("Diffuse color of the material"),
            precision=4, step=0.01, min=0, #max=inf, soft_max=1,
            default=(0.6,0.6,0.6), options={'ANIMATABLE'}, subtype='COLOR')

    darkness: FloatProperty(
            name="Darkness",
            description="Minnaert darkness",
            min=0.0, max=2.0, soft_min=0.0, soft_max=2.0, default=1.0, precision=3)
            
    diffuse_fresnel: FloatProperty(
            name="Diffuse fresnel",
            description="Power of Fresnel",
            min=0.0, max=5.0, soft_min=0.0, soft_max=5.0, default=1.0, precision=3)
            
    diffuse_fresnel_factor: FloatProperty(
            name="Diffuse fresnel factor",
            description="Blending factor of Fresnel",
            min=0.0, max=5.0, soft_min=0.0, soft_max=5.0, default=0.5, precision=3)

    diffuse_intensity: FloatProperty(
            name="Diffuse intensity",
            description="Amount of diffuse reflection multiplying color",
            min=0.0, max=1.0, soft_min=0.0, soft_max=1.0, default=0.8, precision=3)
            
    diffuse_ramp_blend: EnumProperty(
            name="Diffuse ramp blend",
            description="Blending method of the ramp and the diffuse color",   
            items=(("MIX", "Mix", ""),
                   ("ADD", "Add", ""),
                   ("MULTIPLY", "Multiply", ""),
                   ("SUBTRACT", "Subtract", ""),
                   ("SCREEN", "Screen", ""),
                   ("DIVIDE", "Divide", ""),
                   ("DIFFERENCE", "Difference", ""),
                   ("DARKEN", "Darken", ""),
                   ("LIGHTEN", "Lighten", ""),
                   ("OVERLAY", "Overlay", ""),
                   ("DODGE", "Dodge", ""),
                   ("BURN", "Burn", ""),
                   ("HUE", "Hue", ""),
                   ("SATURATION", "Saturation", ""),
                   ("VALUE", "Value", ""),
                   ("COLOR", "Color", ""),
                   ("SOFT_LIGHT", "Soft light", ""),
                   ("LINEAR_LIGHT", "Linear light", "")),
            default="MIX")

    diffuse_ramp_factor: FloatProperty(
            name="Factor",
            description="Blending factor (also uses alpha in Colorband)",
            min=0.0, max=1.0, soft_min=0.0, soft_max=1.0, default=1.0, precision=3)
            
    diffuse_ramp_input: EnumProperty(
            name="Input",
            description="How the ramp maps on the surface",   
            items=(("SHADER", "Shader", ""),
                   ("ENERGY", "Energy", ""),
                   ("NORMAL", "Normal", ""),
                   ("RESULT", "Result", "")),
            default="SHADER")
            
    diffuse_shader: EnumProperty(
            name="Diffuse Shader Model",
            description="How the ramp maps on the surface",   
            items=(("LAMBERT", "Lambert", "Use a Lambertian shader"),
                   ("OREN_NAYAR", "Oren-Nayar", "Use an Oren-Nayar shader"),
                   ("MINNAERT", "Minnaert", "Use a Minnaert shader"),
                   ("FRESNEL", "Fresnel", "Use a Fresnel shader")),
            default="LAMBERT")

    diffuse_toon_size: FloatProperty(
            name="Size",
            description="Size of diffuse toon area",
            min=0.0, max=3.14, soft_min=0.0, soft_max=3.14, default=0.5, precision=3)
            
    diffuse_toon_smooth: FloatProperty(
            name="Smooth",
            description="Smoothness of diffuse toon area",
            min=0.0, max=1.0, soft_min=0.0, soft_max=1.0, default=0.1, precision=3)

    emit: FloatProperty(
            name="Emit",
            description="Amount of light to emit",
            min=0.0, soft_min=0.0, #max=inf, soft_max=inf,
            default=0.0, precision=3)

    mirror_color: FloatVectorProperty(
            name="Mirror color",
            description=("Mirror color of the material"),
            precision=4, step=0.01, min=0, #max=inf, soft_max=1,
            default=(0.6,0.6,0.6), options={'ANIMATABLE'}, subtype='COLOR')
            
    roughness: FloatProperty(
            name="Roughness",
            description="Oren-Nayar Roughness",
            min=0.0, max=3.14, soft_min=0.0, soft_max=3.14, default=0.5, precision=3)

    halo: BoolProperty(
            name="Halo", description=" Halo settings for the material",
            default=False)
            #(was readonly in Blender2.79, never None)
            
    line_color: FloatVectorProperty(
            name="Line color",
            description=("Line color used for Freestyle line rendering"),
            precision=4, step=0.01, min=0, #max=inf, soft_max=1,
            default=(0.0,0.0,0.0), options={'ANIMATABLE'}, subtype='COLOR')

    #diffuse_ramp:
    ##Color ramp used to affect diffuse shading
            ##Type:	ColorRamp, (readonly)    
    
            #cr_node = bpy.data.materials['Material'].node_tree.nodes['ColorRamp']
            #layout.template_color_ramp(cr_node, "color_ramp", expand=True)
            
            #ou
            
            #class bpy.types.ColorRamp(bpy_struct)            

    line_priority: IntProperty(
            name="Recursion Limit",
            description="The line color of a higher priority is used at material boundaries",
            min=0, max=32767, default=0)
            
    specular_color: FloatVectorProperty(
            name="Specular color",
            description=("Specular color of the material "),
            precision=4, step=0.01, min=0, #max=inf, soft_max=1,
            default=(1.0,1.0,1.0), options={'ANIMATABLE'}, subtype='COLOR')

    specular_hardness: IntProperty(
            name="Hardness",
            description="How hard (sharp) the specular reflection is",
            min=1, max=511, default=50)
            
    specular_intensity: FloatProperty(
            name="Intensity",
            description="How intense (bright) the specular reflection is",
            min=0.0, max=1.0, soft_min=0.0, soft_max=1.0, default=0.5, precision=3)

    specular_ior: FloatProperty(
            name="IOR",
            description="Specular index of refraction",
            min=-10.0, max=10.0, soft_min=0.0, soft_max=10.0, default=1.0, precision=3)
            
    ior: FloatProperty(
            name="IOR",
            description="Index of refraction",
            min=-10.0, max=10.0, soft_min=0.0, soft_max=10.0, default=1.0, precision=3)   

    specular_shader: EnumProperty(
            name="Specular Shader Model",
            description="How the ramp maps on the surface",   
            items=(("COOKTORR", "CookTorr", "Use a Cook-Torrance shader"),
                   ("PHONG", "Phong", "Use a Phong shader"),
                   ("BLINN", "Blinn", "Use a Blinn shader"),
                   ("TOON", "Toon", "Use a Toon shader"),
                   ("WARDISO", "WardIso", "Use a Ward anisotropic shader")),
            default="COOKTORR")           

    specular_slope: FloatProperty(
            name="Slope",
            description="The standard deviation of surface slope",
            min=0.0, max=0.4, soft_min=0.0, soft_max=0.4, default=0.1, precision=3)

    specular_toon_size: FloatProperty(
            name="Size",
            description="Size of specular toon area",
            min=0.0, max=0.53, soft_min=0.0, soft_max=0.53, default=0.5, precision=3)

    specular_toon_smooth: FloatProperty(
            name="Smooth",
            description="Smoothness of specular toon area",
            min=0.0, max=1.0, soft_min=0.0, soft_max=1.0, default=0.1, precision=3)
            
            
    translucency: FloatProperty(
            name="Translucency",
            description="Amount of diffuse shading on the back side",
            min=0.0, max=1.0, soft_min=0.0, soft_max=1.0, default=0.0, precision=3)
            
    transparency_method: EnumProperty(
            name="Specular Shader Model",
            description="Method to use for rendering transparency",   
            items=(("MASK", "Mask", "Mask the background"),
                   ("Z_TRANSPARENCY", "Z Transparency", "Use an ior of 1 for transparent faces"),
                   ("RAYTRACE", "Raytrace", "Use raytracing for transparent refraction rendering")),
            default="MASK")
            
    type: EnumProperty(
            name="Type",
            description="Material type defining how the object is rendered",   
            items=(("SURFACE", "Surface", "Render object as a surface"),
                   ("WIRE", "Wire", "Render the edges of faces as wires (not supported in raytracing)"),#TO UPDATE > USE MACRO AND CHANGE DESCRIPTION
                   ("VOLUME", "Volume", "Render object as a volume"),
                   ("‘HALO’", "Halo", "Render object as halo particles")), #TO UPDATE > USE MACRO AND CHANGE DESCRIPTION
            default="SURFACE")
            
    use_cast_shadows: BoolProperty(
            name="Cast", description="Allow this material to cast shadows",
            default=True)
            
    use_cast_shadows_only: BoolProperty(
            name="Cast Only", description="Make objects with this material "
                                          "appear invisible (not rendered), only "
                                          "casting shadows",
            default=False)
            
    use_cubic: BoolProperty(
            name="Cubic Interpolation", description="Use cubic interpolation for diffuse "
                                                    "values, for smoother transitions",
            default=False)

    use_diffuse_ramp: BoolProperty(
            name="Ramp", description="Toggle diffuse ramp operations",
            default=False)
            
    use_light_group_exclusive: BoolProperty(
            name="Exclusive", description="Material uses the light group exclusively"
                                          "- these lamps are excluded from other "
                                          "scene lighting",
            default=False)
            
    use_light_group_local: BoolProperty(
            name="Local", description="When linked in, material uses local light"
                                      " group with the same name",
            default=False)
            
    use_mist: BoolProperty(
            name="Use Mist", description="Use mist with this material "
                                      "(in world settings)",
            default=True)
            
    use_nodes: BoolProperty(
            name="Nodes", description="Use shader nodes to render the material",#Add Icon in UI or here? icon='NODES'
            default=False)
            
    use_object_color: BoolProperty(
            name="Object Color", description="Modulate the result with a per-object color",
            default=False)
            
    use_only_shadow: BoolProperty(
            name="Shadows Only", description="Render shadows as the material’s alpha "
                                             "value, making the material transparent "
                                             "except for shadowed areas",
            default=False)
            
    use_shadeless: BoolProperty(
            name="Shadeless", description="Make this material insensitive to "
                                          "light or shadow",
            default=False)
            
    use_shadows: BoolProperty(
            name="Receive", description="Allow this material to receive shadows",
            default=True)

    use_sky: BoolProperty(
            name="Sky", description="Render this material with zero alpha, "
                                        "with sky background in place (scanline only)",
            default=False)
            
    use_specular_ramp: BoolProperty(
            name="Ramp", description="Toggle specular ramp operations",
            default=False)
            
    use_tangent_shading: BoolProperty(
            name="Tangent Shading", description="Use the material’s tangent vector instead"
                                     "of the normal for shading - for "
                                     "anisotropic shading effects",
            default=False)
            
    use_transparent_shadows: BoolProperty(
            name="Receive Transparent", description="Allow this object to receive transparent "
                                                    "shadows cast through other object",
            default=False) #linked to fake caustics
            
    use_vertex_color_light: BoolProperty(
            name="Vertex Color Light", description="Add vertex colors as additional lighting",
            default=False)
            
    use_vertex_color_paint: BoolProperty(
            name="Vertex Color Paint", description="Replace object base color with vertex "
                                                   "colors (multiply with ‘texture face’ "
                                                   "face assigned textures)",
            default=False)

    
    specular_ramp_blend: EnumProperty(
            name="Specular ramp blend",
            description="Blending method of the ramp and the specular color",   
            items=(("MIX", "Mix", ""),
                   ("ADD", "Add", ""),
                   ("MULTIPLY", "Multiply", ""),
                   ("SUBTRACT", "Subtract", ""),
                   ("SCREEN", "Screen", ""),
                   ("DIVIDE", "Divide", ""),
                   ("DIFFERENCE", "Difference", ""),
                   ("DARKEN", "Darken", ""),
                   ("LIGHTEN", "Lighten", ""),
                   ("OVERLAY", "Overlay", ""),
                   ("DODGE", "Dodge", ""),
                   ("BURN", "Burn", ""),
                   ("HUE", "Hue", ""),
                   ("SATURATION", "Saturation", ""),
                   ("VALUE", "Value", ""),
                   ("COLOR", "Color", ""),
                   ("SOFT_LIGHT", "Soft light", ""),
                   ("LINEAR_LIGHT", "Linear light", "")),
            default="MIX")

    specular_ramp_factor: FloatProperty(
            name="Factor",
            description="Blending factor (also uses alpha in Colorband)",
            min=0.0, max=1.0, soft_min=0.0, soft_max=1.0, default=1.0, precision=3)
            
    specular_ramp_input: EnumProperty(
            name="Input",
            description="How the ramp maps on the surface",   
            items=(("SHADER", "Shader", ""),
                   ("ENERGY", "Energy", ""),
                   ("NORMAL", "Normal", ""),
                   ("RESULT", "Result", "")),
            default="SHADER")            


    irid_enable: BoolProperty(
            name="Iridescence coating",
            description="Newton's thin film interference (like an oil slick on a puddle of "
                        "water or the rainbow hues of a soap bubble.)",
            default=False)

    mirror_use_IOR: BoolProperty(
            name="Correct Reflection",
            description="Use same IOR as raytrace transparency to calculate mirror reflections. "
                        "More physically correct",
            default=False)

    mirror_metallic: BoolProperty(
            name="Metallic Reflection",
            description="mirror reflections get colored as diffuse (for metallic materials)",
            default=False)

    conserve_energy: BoolProperty(
            name="Conserve Energy",
            description="Light transmitted is more correctly reduced by mirror reflections, "
                        "also the sum of diffuse and translucency gets reduced below one ",
            default=True)

    irid_amount: FloatProperty(
            name="amount",
            description="Contribution of the iridescence effect to the overall surface color. "
                        "As a rule of thumb keep to around 0.25 (25% contribution) or less, "
                        "but experiment. If the surface is coming out too white, try lowering "
                        "the diffuse and possibly the ambient values of the surface",
            min=0.0, max=1.0, soft_min=0.01, soft_max=1.0, default=0.25)

    irid_thickness: FloatProperty(
            name="thickness",
            description="A very thin film will have a high frequency of color changes while a "
                        "thick film will have large areas of color",
            min=0.0, max=1000.0, soft_min=0.1, soft_max=10.0, default=1)

    irid_turbulence: FloatProperty(
            name="turbulence", description="This parameter varies the thickness",
            min=0.0, max=10.0, soft_min=0.000, soft_max=1.0, default=0)

    interior_fade_color: FloatVectorProperty(
            name="Interior Fade Color", description="Color of filtered attenuation for transparent "
                                           "materials",
            precision=4, step=0.01, min=0.0, soft_max=1.0,
            default=(0, 0, 0), options={'ANIMATABLE'}, subtype='COLOR')

    caustics_enable: BoolProperty(
            name="Caustics",
            description="use only fake refractive caustics (default) or photon based "
                        "reflective/refractive caustics",
            default=True)

    fake_caustics: BoolProperty(
            name="Fake Caustics", description="use only (Fast) fake refractive caustics",
            default=True)

    fake_caustics_power: FloatProperty(
            name="Fake caustics power",
            description="Values typically range from 0.0 to 1.0 or higher. Zero is no caustics. "
                        "Low, non-zero values give broad hot-spots while higher values give "
                        "tighter, smaller simulated focal points",
            min=0.00, max=10.0, soft_min=0.00, soft_max=5.0, default=0.15)

    refraction_caustics: BoolProperty(
            name="Refractive Caustics", description="hotspots of light focused when going through the material",
            default=True)

    photons_dispersion: FloatProperty(
            name="Chromatic Dispersion",
            description="Light passing through will be separated according to wavelength. "
                        "This ratio of refractive indices for violet to red controls how much "
                        "the colors are spread out 1 = no dispersion, good values are 1.01 to 1.1",
            min=1.0000, max=10.000, soft_min=1.0000, soft_max=1.1000, precision=4, default=1.0000)

    photons_dispersion_samples: IntProperty(
            name="Dispersion Samples", description="Number of color-steps for dispersion",
            min=2, max=128, default=7)

    photons_reflection: BoolProperty(
            name="Reflective Photon Caustics",
            description="Use this to make your Sauron's ring ;-P",
            default=False)

    refraction_type: EnumProperty(
            items=[
                   ("1", "Z Transparency Fake Caustics", "use fake caustics"),
                   ("2", "Raytrace Photons Caustics", "use photons for refractive caustics")],
            name="Refraction Type:",
            description="use fake caustics (fast) or true photons for refractive Caustics",
            default="1")

    ##################################CustomPOV Code############################
    replacement_text: StringProperty(
            name="Declared name:",
            description="Type the declared name in custom POV code or an external "
                        ".inc it points at. texture {} expected",
            default="")



            # NODES

    def use_material_nodes_callback(self, context):
        if hasattr(context.space_data, "tree_type"):
            context.space_data.tree_type = 'ObjectNodeTree'
        mat=context.object.active_material
        if mat.pov.material_use_nodes:
            mat.use_nodes=True
            tree = mat.node_tree
            tree.name=mat.name
            links = tree.links
            default = True
            if len(tree.nodes) == 2:
                o = 0
                m = 0
                for node in tree.nodes:
                    if node.type in {"OUTPUT","MATERIAL"}:
                        tree.nodes.remove(node)
                        default = True
                for node in tree.nodes:
                    if node.bl_idname == 'PovrayOutputNode':
                        o+=1
                    if node.bl_idname == 'PovrayTextureNode':
                        m+=1
                if o == 1 and m == 1:
                    default = False
            elif len(tree.nodes) == 0:
                default = True
            else:
                default = False
            if default:
                output = tree.nodes.new('PovrayOutputNode')
                output.location = 200,200
                tmap = tree.nodes.new('PovrayTextureNode')
                tmap.location = 0,200
                links.new(tmap.outputs[0],output.inputs[0])
                tmap.select = True
                tree.nodes.active = tmap
        else:
            mat.use_nodes=False


    def use_texture_nodes_callback(self, context):
        tex=context.object.active_material.active_texture
        if tex.pov.texture_use_nodes:
            tex.use_nodes=True
            if len(tex.node_tree.nodes)==2:
                for node in tex.node_tree.nodes:
                    if node.type in {"OUTPUT","CHECKER"}:
                        tex.node_tree.nodes.remove(node)
        else:
            tex.use_nodes=False

    def node_active_callback(self, context):
        items = []
        mat=context.material
        mat.node_tree.nodes
        for node in mat.node_tree.nodes:
            node.select=False
        for node in mat.node_tree.nodes:
            if node.name==mat.pov.material_active_node:
                node.select=True
                mat.node_tree.nodes.active=node

                return node

    def node_enum_callback(self, context):
        items = []
        mat=context.material
        nodes=mat.node_tree.nodes
        for node in nodes:
            items.append(("%s"%node.name,"%s"%node.name,""))
        return items

    def pigment_normal_callback(self, context):
        render = context.scene.pov.render
        items = [("pigment", "Pigment", ""),("normal", "Normal", "")]
        if render == 'hgpovray':
            items = [("pigment", "Pigment", ""),("normal", "Normal", ""),("modulation", "Modulation", "")]
        return items

    def glow_callback(self, context):
        scene = context.scene
        ob = context.object
        ob.pov.mesh_write_as_old = ob.pov.mesh_write_as
        if scene.pov.render == 'uberpov' and ob.pov.glow:
            ob.pov.mesh_write_as = 'NONE'
        else:
            ob.pov.mesh_write_as = ob.pov.mesh_write_as_old

    material_use_nodes: BoolProperty(name="Use nodes", description="", update=use_material_nodes_callback, default=False)
    material_active_node: EnumProperty(name="Active node", description="", items=node_enum_callback, update=node_active_callback)
    preview_settings: BoolProperty(name="Preview Settings", description="",default=False)
    object_preview_transform: BoolProperty(name="Transform object", description="",default=False)
    object_preview_scale: FloatProperty(name="XYZ", min=0.5, max=2.0, default=1.0)
    object_preview_rotate: FloatVectorProperty(name="Rotate", description="", min=-180.0, max=180.0,default=(0.0,0.0,0.0), subtype='XYZ')
    object_preview_bgcontrast: FloatProperty(name="Contrast", min=0.0, max=1.0, default=0.5)

class MaterialRaytraceTransparency(PropertyGroup):
    """Declare transparency panel properties controllable in UI and translated to POV."""
           
    depth: IntProperty(
            name="Depth",
            description="Maximum allowed number of light inter-refractions",
            min=0, max=32767, default=2)
            
    depth_max: FloatProperty(
            name="Depth",
            description="Maximum depth for light to travel through the "
                        "transparent material before becoming fully filtered (0.0 is disabled)",
            min=0, max=100, default=0.0)
            
    falloff: FloatProperty(
            name="Falloff",
            description="Falloff power for transmissivity filter effect (1.0 is linear)",
            min=0.1, max=10.0, default=1.0, precision=3)
    filter: FloatProperty(
            name="Filter",
            description="Amount to blend in the material’s diffuse color in raytraced "
                        "transparency (simulating absorption)",
            min=0.0, max=1.0, default=0.0, precision=3)

    fresnel: FloatProperty(
            name="Fresnel",
            description="Power of Fresnel for transparency (Ray or ZTransp)",
            min=0.0, max=5.0, soft_min=0.0, soft_max=5.0, default=0.0, precision=3)

    fresnel_factor: FloatProperty(
            name="Blend",
            description="Blending factor for Fresnel",
            min=0.0, max=5.0, soft_min=0.0, soft_max=5.0, default=1.250, precision=3)
            
    gloss_factor: FloatProperty(
            name="Amount",
            description="The clarity of the refraction. "
                        "(values < 1.0 give diffuse, blurry refractions)",
            min=0.0, max=1.0, soft_min=0.0, soft_max=1.0, default=1.0, precision=3)

    gloss_samples: IntProperty(
            name="Samples",
            description="Number of cone samples averaged for blurry refractions",
            min=0, max=1024, default=18)

    gloss_threshold: FloatProperty(
            name="Threshold",
            description="Threshold for adaptive sampling (if a sample "
                        "contributes less than this amount [as a percentage], "
                        "sampling is stopped)",
            min=0.0, max=1.0, soft_min=0.0, soft_max=1.0, default=0.005, precision=3)

    ior: FloatProperty(
            name="IOR", description="Sets angular index of refraction for raytraced refraction",
            min=-0.0, max=10.0, soft_min=0.25, soft_max=4.0, default=1.3)
            
class MaterialRaytraceMirror(PropertyGroup):
    """Declare reflection panel properties controllable in UI and translated to POV."""

    bl_description = "Raytraced reflection settings for the Material",  
    use: BoolProperty(
            name="Mirror", 
            description="Enable raytraced reflections",
            default=False)
            

    depth: IntProperty(
            name="Depth",
            description="Maximum allowed number of light inter-reflections",
            min=0, max=32767, default=2)

    distance: FloatProperty(
            name="Max Dist",
            description="Maximum distance of reflected rays "
                        "(reflections further than this range "
                        "fade to sky color or material color)",
            min=0.0, max=100000.0, soft_min=0.0, soft_max=10000.0, default=0.0, precision=3)

    fade_to: EnumProperty(
            items=[
                   ("FADE_TO_SKY", "Fade to sky", ""),
                   ("FADE_TO_MATERIAL", "Fade to material color", "")],
            name="Fade-out Color",
            description="The color that rays with no intersection within the "
                        "Max Distance take (material color can be best for "
                        "indoor scenes, sky color for outdoor)",
            default="FADE_TO_SKY")

    fresnel: FloatProperty(
            name="Fresnel",
            description="Power of Fresnel for mirror reflection",
            min=0.0, max=5.0, soft_min=0.0, soft_max=5.0, default=0.0, precision=3)

    fresnel_factor: FloatProperty(
            name="Blend",
            description="Blending factor for Fresnel",
            min=0.0, max=5.0, soft_min=0.0, soft_max=5.0, default=1.250, precision=3)

    gloss_anisotropic: FloatProperty(
            name="Anisotropic",
            description="The shape of the reflection, from 0.0 (circular) "
                        "to 1.0 (fully stretched along the tangent",
            min=0.0, max=1.0, soft_min=0.0, soft_max=1.0, default=1.0, precision=3)

    gloss_factor: FloatProperty(
            name="Amount",
            description="The shininess of the reflection  "
                        "(values < 1.0 give diffuse, blurry reflections)",
            min=0.0, max=1.0, soft_min=0.0, soft_max=1.0, default=1.0, precision=3)

    gloss_samples: IntProperty(
            name="Samples",
            description="Number of cone samples averaged for blurry reflections",
            min=0, max=1024, default=18)

    gloss_threshold: FloatProperty(
            name="Threshold",
            description="Threshold for adaptive sampling (if a sample "
                        "contributes less than this amount [as a percentage], "
                        "sampling is stopped)",
            min=0.0, max=1.0, soft_min=0.0, soft_max=1.0, default=0.005, precision=3)

    mirror_color: FloatVectorProperty(
            name="Mirror color",
            description=("Mirror color of the material"),
            precision=4, step=0.01,
            default=(1.0,1.0,1.0), options={'ANIMATABLE'}, subtype='COLOR')
            
    reflect_factor: FloatProperty(
            name="Reflectivity",
            description="Amount of mirror reflection for raytrace",
            min=0.0, max=1.0, soft_min=0.0, soft_max=1.0, default=1.0, precision=3)
            
class MaterialSubsurfaceScattering(PropertyGroup):
    r"""Declare SSS/SSTL properties controllable in UI and translated to POV."""

    bl_description = "Subsurface scattering settings for the material",          

    use: BoolProperty(
            name="Subsurface Scattering", 
            description="Enable diffuse subsurface scatting "
                        "effects in a material",
            default=False)

            
            
    back: FloatProperty(
            name="Back",
            description="Back scattering weight",
            min=0.0, max=10.0, soft_min=0.0, soft_max=10.0, default=1.0, precision=3)


    color: FloatVectorProperty(
            name="Scattering color",
            description=("Scattering color"),
            precision=4, step=0.01,
            default=(0.604,0.604,0.604), options={'ANIMATABLE'}, subtype='COLOR')

    color_factor: FloatProperty(
            name="Color",
            description="Blend factor for SSS colors",
            min=0.0, max=1.0, soft_min=0.0, soft_max=1.0, default=1.0, precision=3)

    error_threshold: FloatProperty(
            name="Error",
            description="Error tolerance (low values are slower and higher quality)",
            default=0.050, precision=3)

    front: FloatProperty(
            name="Front",
            description="Front scattering weight",
            min=0.0, max=2.0, soft_min=0.0, soft_max=2.0, default=1.0, precision=3)

    ior: FloatProperty(
            name="IOR", description="Index of refraction (higher values are denser)",
            min=-0.0, max=10.0, soft_min=0.1, soft_max=2.0, default=1.3)

    radius: FloatVectorProperty(
            name="RGB Radius",
            description=("Mean red/green/blue scattering path length"),
            precision=4, step=0.01, min=0.001,
            default=(1.0,1.0,1.0), options={'ANIMATABLE'})

    scale: FloatProperty(
            name="Scale",
            description="Object scale factor",
            default=0.100, precision=3)

    texture_factor: FloatProperty(
            name="Texture",
            description="Texture scattering blend factor",
            min=0.0, max=1.0, soft_min=0.0, soft_max=1.0, default=0.0, precision=3)

class MaterialStrandSettings(PropertyGroup):
    """Declare strand properties controllable in UI and translated to POV."""

    bl_description = "Strand settings for the material",          

    blend_distance: FloatProperty(
            name="Distance",
            description="Worldspace distance over which to blend in the surface normal",
            min=0.0, max=10.0, soft_min=0.0, soft_max=10.0, default=0.0, precision=3)

    root_size: FloatProperty(
            name="Root",
            description="Start size of strands in pixels or Blender units",
            min=0.25, default=1.0, precision=5)

    shape: FloatProperty(
            name="Shape",
            description="Positive values make strands rounder, negative ones make strands spiky",
            min=-0.9, max=0.9, default=0.0, precision=3)

    size_min: FloatProperty(
            name="Minimum",
            description="Minimum size of strands in pixels",
            min=0.001, max=10.0, default=1.0, precision=3)

    tip_size: FloatProperty(
            name="Tip",
            description="End size of strands in pixels or Blender units",
            min=0.0, default=1.0, precision=5)

    use_blender_units: BoolProperty(
            name="Blender Units", 
            description="Use Blender units for widths instead of pixels",
            default=False)

    use_surface_diffuse: BoolProperty(
            name="Surface diffuse", 
            description="Make diffuse shading more similar to shading the surface",
            default=False)

    use_tangent_shading: BoolProperty(
            name="Tangent Shading", 
            description="Use direction of strands as normal for tangent-shading",
            default=True)

    uv_layer: StringProperty(
            name="UV Layer",
            #icon="GROUP_UVS",
            description="Name of UV map to override",
            default="")

    width_fade: FloatProperty(
            name="Width Fade",
            description="Transparency along the width of the strand",
            min=0.0, max=2.0, default=0.0, precision=3)

            
            # halo

                # Halo settings for the material
                # Type:	MaterialHalo, (readonly, never None)            

            # ambient

                # Amount of global ambient color the material receives
                # Type:	float in [0, 1], default 0.0

            # darkness

                # Minnaert darkness
                # Type:	float in [0, 2], default 0.0

            # diffuse_color

                # Diffuse color of the material
                # Type:	float array of 3 items in [0, inf], default (0.0, 0.0, 0.0)

            # diffuse_fresnel

                # Power of Fresnel
                # Type:	float in [0, 5], default 0.0

            # diffuse_fresnel_factor

                # Blending factor of Fresnel
                # Type:	float in [0, 5], default 0.0

            # diffuse_intensity

                # Amount of diffuse reflection
                # Type:	float in [0, 1], default 0.0

            # diffuse_ramp

                # Color ramp used to affect diffuse shading
                # Type:	ColorRamp, (readonly)

            # diffuse_ramp_blend

                # Blending method of the ramp and the diffuse color
                # Type:	enum in [‘MIX’, ‘ADD’, ‘MULTIPLY’, ‘SUBTRACT’, ‘SCREEN’, ‘DIVIDE’, ‘DIFFERENCE’, ‘DARKEN’, ‘LIGHTEN’, ‘OVERLAY’, ‘DODGE’, ‘BURN’, ‘HUE’, ‘SATURATION’, ‘VALUE’, ‘COLOR’, ‘SOFT_LIGHT’, ‘LINEAR_LIGHT’], default ‘MIX’

            # diffuse_ramp_factor

                # Blending factor (also uses alpha in Colorband)
                # Type:	float in [0, 1], default 0.0

            # diffuse_ramp_input

                # How the ramp maps on the surface
                # Type:	enum in [‘SHADER’, ‘ENERGY’, ‘NORMAL’, ‘RESULT’], default ‘SHADER’

            # diffuse_shader

                    # LAMBERT Lambert, Use a Lambertian shader.
                    # OREN_NAYAR Oren-Nayar, Use an Oren-Nayar shader.
                    # TOON Toon, Use a toon shader.
                    # MINNAERT Minnaert, Use a Minnaert shader.
                    # FRESNEL Fresnel, Use a Fresnel shader.

                # Type:	enum in [‘LAMBERT’, ‘OREN_NAYAR’, ‘TOON’, ‘MINNAERT’, ‘FRESNEL’], default ‘LAMBERT’

            # diffuse_toon_size

                # Size of diffuse toon area
                # Type:	float in [0, 3.14], default 0.0

            # diffuse_toon_smooth

                # Smoothness of diffuse toon area
                # Type:	float in [0, 1], default 0.0

            # emit

                # Amount of light to emit
                # Type:	float in [0, inf], default 0.0

            # game_settings

                # Game material settings
                # Type:	MaterialGameSettings, (readonly, never None)

            # halo

                # Halo settings for the material
                # Type:	MaterialHalo, (readonly, never None)

            # invert_z

                # Render material’s faces with an inverted Z buffer (scanline only)
                # Type:	boolean, default False

            # light_group

                # Limit lighting to lamps in this Group
                # Type:	Group

            # line_color

                # Line color used for Freestyle line rendering
                # Type:	float array of 4 items in [0, inf], default (0.0, 0.0, 0.0, 0.0)

            # line_priority

                # The line color of a higher priority is used at material boundaries
                # Type:	int in [0, 32767], default 0

            # mirror_color

                # Mirror color of the material
                # Type:	float array of 3 items in [0, inf], default (0.0, 0.0, 0.0)