render.py

# ##### BEGIN GPL LICENSE BLOCK #####
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
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#  along with this program; if not, write to the Free Software Foundation,
#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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# ##### END GPL LICENSE BLOCK #####

import bpy
import subprocess
import os
import sys
import time
import math
from math import atan, pi, degrees, sqrt

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


##############################SF###########################
##############find image texture 
def splitExt(path):
    dotidx = path.rfind('.')
    if dotidx == -1:
        return path, ''
    else:
        return (path[dotidx:]).upper().replace('.','')


def imageFormat(imgF):
    ext = ''
    ext_orig = splitExt(imgF)
    if ext_orig == 'JPG' or ext_orig == 'JPEG': ext='jpeg'
    if ext_orig == 'GIF': ext = 'gif'
    if ext_orig == 'TGA': ext = 'tga'
    if ext_orig == 'IFF': ext = 'iff'
    if ext_orig == 'PPM': ext = 'ppm'
    if ext_orig == 'PNG': ext = 'png'
    if ext_orig == 'SYS': ext = 'sys' 
    if ext_orig in ('TIFF', 'TIF'): ext = 'tiff'
    if ext_orig == 'EXR': ext = 'exr'#POV3.7 Only! 
    if ext_orig == 'HDR': ext = 'hdr'#POV3.7 Only! --MR
    print(imgF)
    if not ext: print(' WARNING: texture image  format not supported ') # % (imgF , '')) #(ext_orig)))
    return ext

def imgMap(ts):
    image_map=''
    if ts.mapping=='FLAT':image_map= ' map_type 0 ' 
    if ts.mapping=='SPHERE':image_map= ' map_type 1 '# map_type 7 in megapov
    if ts.mapping=='TUBE':image_map= ' map_type 2 '
    #if ts.mapping=='?':image_map= ' map_type 3 '# map_type 3 and 4 in development (?) for Povray, currently they just seem to default back to Flat (type 0)
    #if ts.mapping=='?':image_map= ' map_type 4 '# map_type 3 and 4 in development (?) for Povray, currently they just seem to default back to Flat (type 0)
    if ts.texture.use_interpolation: image_map+= ' interpolate 2 '
    if ts.texture.extension == 'CLIP': image_map+=' once '
    #image_map+='}'
    #if ts.mapping=='CUBE':image_map+= 'warp { cubic } rotate <-90,0,180>' #no direct cube type mapping. Though this should work in POV 3.7 it doesn't give that good results(best suited to environment maps?)
    #if image_map=='': print(' No texture image  found ')
    return image_map

def imgMapBG(wts):
    image_mapBG=''
    if wts.texture_coords== 'VIEW':image_mapBG= ' map_type 0 ' #texture_coords refers to the mapping of world textures
    if wts.texture_coords=='ANGMAP':image_mapBG= ' map_type 1 '
    if wts.texture_coords=='TUBE':image_mapBG= ' map_type 2 '
    if wts.texture.use_interpolation: image_mapBG+= ' interpolate 2 '
    if wts.texture.extension == 'CLIP': image_mapBG+=' once '
    #image_mapBG+='}'
    #if wts.mapping=='CUBE':image_mapBG+= 'warp { cubic } rotate <-90,0,180>' #no direct cube type mapping. Though this should work in POV 3.7 it doesn't give that good results(best suited to environment maps?)
    #if image_mapBG=='': print(' No background texture image  found ')
    return image_mapBG

def splitFile(path):
    idx = path.rfind('/')
    if idx == -1:
        idx = path.rfind('\\')
    return path[idx:].replace('/', '').replace('\\', '')

def splitPath(path):
    idx = path.rfind('/')
    if idx == -1:
        return path, ''
    else:
        return path[:idx]

def findInSubDir(filename, subdirectory=''):
    pahFile=''
    if subdirectory:
        path = subdirectory
    else:
        path = os.getcwd()
    try:
        for root, dirs, names in os.walk(path):
            if filename in names:
                pahFile = os.path.join(root, filename)
        return pahFile
    except OSError:
        return '' 

def path_image(image):
    import os
    fn = bpy.path.abspath(image)
    fn_strip = os.path.basename(fn)
    if not os.path.isfile(fn):
        fn=(findInSubDir(splitFile(fn),splitPath(bpy.data.filepath)))
        ()
    return fn

##############end find image texture 

def splitHyphen(name):
    hyphidx = name.find('-')
    if hyphidx == -1:
        return name
    else:
        return (name[hyphidx:]).replace('-','')

##############safety string name material
def safety(name, Level):
    # Level=1 is for texture with No specular nor Mirror reflection
    # Level=2 is for texture with translation of spec and mir levels for when no map influences them
    # Level=3 is for texture with Maximum Spec and Mirror 

    try:
        if int(name) > 0:
            prefix='shader'
    except:
        prefix = ''
    prefix='shader_'
    name = splitHyphen(name)
    if Level == 2:
        return prefix+name
    elif Level == 1:
        return prefix+name+'0'#used for 0 of specular map
    elif Level == 3:
        return prefix+name+'1'#used for 1 of specular map


##############end safety string name material
##############################EndSF###########################

TabLevel = 0

def write_pov(filename, scene=None, info_callback=None):
    import mathutils
    #file = filename
    file = open(filename.name, 'w')

    # Only for testing
    if not scene:
        scene = bpy.data.scenes[0]

    render = scene.render
    world = scene.world
    global_matrix = mathutils.Matrix.Rotation(-pi / 2.0, 4, 'X')

    def setTab(tabtype, spaces):
        TabStr = ''
        if tabtype == '0':
            TabStr = ''
        elif tabtype == '1': 
            TabStr = '\t'
        elif tabtype == '2':
            TabStr = spaces * ' '
        return TabStr

    Tab = setTab(scene.pov_indentation_character, scene.pov_indentation_spaces)

    def tabWrite(str_o):
        global TabLevel
        brackets = str_o.count('{') - str_o.count('}')
        if brackets < 0:
            TabLevel = TabLevel + brackets 
        if TabLevel < 0:
            print('Indentation Warning: TabLevel = %s' % TabLevel)
            TabLevel = 0
        if TabLevel >= 1: 
            file.write('%s' % Tab * TabLevel)
        file.write(str_o)
        if brackets > 0:
            TabLevel = TabLevel + brackets 

    def uniqueName(name, nameSeq):

        if name not in nameSeq:
            return name

        name_orig = name
        i = 1
        while name in nameSeq:
            name = '%s_%.3d' % (name_orig, i)
            i += 1
        name = splitHyphen(name)
        return name

    def writeMatrix(matrix):
        tabWrite('matrix <%.6f, %.6f, %.6f,  %.6f, %.6f, %.6f,  %.6f, %.6f, %.6f,  %.6f, %.6f, %.6f>\n' %\
        (matrix[0][0], matrix[0][1], matrix[0][2], matrix[1][0], matrix[1][1], matrix[1][2], matrix[2][0], matrix[2][1], matrix[2][2], matrix[3][0], matrix[3][1], matrix[3][2]))

    def writeObjectMaterial(material):
        
        # DH - modified some variables to be function local, avoiding RNA write
        # this should be checked to see if it is functionally correct
        
        if material: #and material.transparency_method == 'RAYTRACE':#Commented out: always write IOR to be able to use it for SSS, Fresnel reflections...
            #But there can be only one!
            if material.subsurface_scattering.use:#SSS IOR get highest priority
                tabWrite('interior {\n')
                tabWrite('ior %.6f\n' % material.subsurface_scattering.ior)
            elif material.pov_mirror_use_IOR:#Then the raytrace IOR taken from raytrace transparency properties and used for reflections if IOR Mirror option is checked
                tabWrite('interior {\n')
                tabWrite('ior %.6f\n' % material.raytrace_transparency.ior)
            else:
                tabWrite('interior {\n')
                tabWrite('ior %.6f\n' % material.raytrace_transparency.ior)
                
            pov_fake_caustics = False
            pov_photons_refraction = False
            pov_photons_reflection = False
                
            if material.pov_refraction_type=='0':
                pov_fake_caustics = False
                pov_photons_refraction = False
                pov_photons_reflection = True #should respond only to proper checkerbox
            elif material.pov_refraction_type=='1':
                pov_fake_caustics = True
                pov_photons_refraction = False
            elif material.pov_refraction_type=='2':
                pov_fake_caustics = False
                pov_photons_refraction = True

            #If only Raytrace transparency is set, its IOR will be used for refraction, but user can set up 'un-physical' fresnel reflections in raytrace mirror parameters. 
            #Last, if none of the above is specified, user can set up 'un-physical' fresnel reflections in raytrace mirror parameters. And pov IOR defaults to 1. 
            if material.pov_caustics_enable:
                if pov_fake_caustics:
                    tabWrite('caustics %.3g\n' % material.pov_fake_caustics_power)
                if pov_photons_refraction:
                    tabWrite('dispersion %.3g\n' % material.pov_photons_dispersion) #Default of 1 means no dispersion
            #TODO        
            # Other interior args
            # if material.use_transparency and material.transparency_method == 'RAYTRACE':
            # fade_distance 2
            # fade_power [Value]
            # fade_color

            # (variable) dispersion_samples (constant count for now)
            tabWrite('}\n')
            if pov_photons_refraction or pov_photons_reflection:
                tabWrite('photons{\n')
                tabWrite('target\n')
                if pov_photons_refraction:
                    tabWrite('refraction on\n')
                if pov_photons_reflection:
                    tabWrite('reflection on\n')
                tabWrite('}\n')
                
    materialNames = {}
    DEF_MAT_NAME = 'Default'

    def writeMaterial(material):
        # Assumes only called once on each material
        if material:
            name_orig = material.name
        else:
            name_orig = DEF_MAT_NAME

        name = materialNames[name_orig] = uniqueName(bpy.path.clean_name(name_orig), materialNames)
        comments = scene.pov_comments_enable

        ##################Several versions of the finish: Level conditions are variations for specular/Mirror texture channel map with alternative finish of 0 specular and no mirror reflection
        # Level=1 Means No specular nor Mirror reflection
        # Level=2 Means translation of spec and mir levels for when no map influences them
        # Level=3 Means Maximum Spec and Mirror 
        def povHasnoSpecularMaps(Level):
            if Level == 1:
                tabWrite('#declare %s = finish {' % safety(name, Level = 1))
                if comments: file.write('  //No specular nor Mirror reflection\n')
                else: tabWrite('\n')
            elif Level == 2:
                tabWrite('#declare %s = finish {' % safety(name, Level = 2))
                if comments: file.write('  //translation of spec and mir levels for when no map influences them\n')
                else: tabWrite('\n')
            elif Level == 3:
                tabWrite('#declare %s = finish {' % safety(name, Level = 3))
                if comments: file.write('  //Maximum Spec and Mirror\n')
                else: tabWrite('\n')


            if material:
                #Povray 3.7 now uses two diffuse values respectively for front and back shading (the back diffuse is like blender translucency)
                frontDiffuse=material.diffuse_intensity
                backDiffuse=material.translucency
                
            
                if material.pov_conserve_energy:

                    #Total should not go above one
                    if (frontDiffuse + backDiffuse) <= 1.0:
                        pass
                    elif frontDiffuse==backDiffuse:
                        frontDiffuse = backDiffuse = 0.5 # Try to respect the user's 'intention' by comparing the two values but bringing the total back to one
                    elif frontDiffuse>backDiffuse:       # Let the highest value stay the highest value
                        backDiffuse = 1-(1-frontDiffuse)
                    else:
                        frontDiffuse = 1-(1-backDiffuse)
                    

                # map hardness between 0.0 and 1.0
                roughness = ((1.0 - ((material.specular_hardness - 1.0) / 510.0)))
                ## scale from 0.0 to 0.1
                roughness *= 0.1 
                # add a small value because 0.0 is invalid
                roughness += (1 / 511.0)

                #####################################Diffuse Shader######################################
                # Not used for Full spec (Level=3) of the shader
                if material.diffuse_shader == 'OREN_NAYAR' and Level != 3:
                    tabWrite('brilliance %.3g\n' % (0.9+material.roughness))#blender roughness is what is generally called oren nayar Sigma, and brilliance in povray

                if material.diffuse_shader == 'TOON' and Level != 3:
                    tabWrite('brilliance %.3g\n' % (0.01+material.diffuse_toon_smooth*0.25))
                    frontDiffuse*=0.5 #Lower diffuse and increase specular for toon effect seems to look better in povray
                
                if material.diffuse_shader == 'MINNAERT' and Level != 3:
                    #tabWrite('aoi %.3g\n' % material.darkness)
                    pass #let's keep things simple for now
                if material.diffuse_shader == 'FRESNEL' and Level != 3:
                    #tabWrite('aoi %.3g\n' % material.diffuse_fresnel_factor)
                    pass #let's keep things simple for now
                if material.diffuse_shader == 'LAMBERT' and Level != 3:
                    tabWrite('brilliance 1.8\n') #trying to best match lambert attenuation by that constant brilliance value

                if Level == 2:   
                    ####################################Specular Shader######################################
                    if material.specular_shader == 'COOKTORR' or material.specular_shader == 'PHONG':#No difference between phong and cook torrence in blender HaHa!
                        tabWrite('phong %.3g\n' % (material.specular_intensity))
                        tabWrite('phong_size %.3g\n'% (material.specular_hardness / 2 + 0.25)) 

                    if material.specular_shader == 'BLINN':#Povray 'specular' keyword corresponds to a Blinn model, without the ior.
                        tabWrite('specular %.3g\n' % (material.specular_intensity * (material.specular_ior/4))) #Use blender Blinn's IOR just as some factor for spec intensity
                        tabWrite('roughness %.3g\n' % roughness) 
                        #Could use brilliance 2(or varying around 2 depending on ior or factor) too.


                    if material.specular_shader == 'TOON':
                        tabWrite('phong %.3g\n' % (material.specular_intensity * 2))
                        tabWrite('phong_size %.3g\n' % (0.1+material.specular_toon_smooth / 2)) #use extreme phong_size


                    if material.specular_shader == 'WARDISO':
                        tabWrite('specular %.3g\n' % (material.specular_intensity / (material.specular_slope+0.0005))) #find best suited default constant for brilliance Use both phong and specular for some values.
                        tabWrite('roughness %.4g\n' % (0.0005+material.specular_slope/10)) #find best suited default constant for brilliance Use both phong and specular for some values.
                        tabWrite('brilliance %.4g\n' % (1.8-material.specular_slope*1.8)) #find best suited default constant for brilliance Use both phong and specular for some values.
                        

                    
                    #########################################################################################
                elif Level == 1:
                    tabWrite('specular 0\n')
                elif Level == 3:
                    tabWrite('specular 1\n')
                tabWrite('diffuse %.3g %.3g\n' % (frontDiffuse, backDiffuse))


                tabWrite('ambient %.3g\n' % material.ambient)
                #tabWrite('ambient rgb <%.3g, %.3g, %.3g>\n' % tuple([c*material.ambient for c in world.ambient_color])) # povray blends the global value
                tabWrite('emission %.3g\n' % material.emit) #New in povray 3.7
                
                #tabWrite('roughness %.3g\n' % roughness) #povray just ignores roughness if there's no specular keyword
                
                if material.pov_conserve_energy:
                    tabWrite('conserve_energy\n')#added for more realistic shading. Needs some checking to see if it really works. --Maurice.

                # 'phong 70.0 '
                if Level != 1:
                    if material.raytrace_mirror.use:
                        raytrace_mirror = material.raytrace_mirror
                        if raytrace_mirror.reflect_factor:
                            tabWrite('reflection {\n')
                            tabWrite('rgb <%.3g, %.3g, %.3g>' % tuple(material.mirror_color))
                            if material.pov_mirror_metallic:
                                tabWrite('metallic %.3g' % (raytrace_mirror.reflect_factor))
                            if material.pov_mirror_use_IOR: #WORKING ?
                                tabWrite('fresnel 1 ')#Removed from the line below: gives a more physically correct material but needs proper IOR. --Maurice
                            tabWrite('falloff %.3g exponent %.3g} ' % (raytrace_mirror.fresnel, raytrace_mirror.fresnel_factor))

                if material.subsurface_scattering.use:
                    subsurface_scattering = material.subsurface_scattering
                    tabWrite('subsurface { <%.3g, %.3g, %.3g>, <%.3g, %.3g, %.3g> }\n' % (sqrt(subsurface_scattering.radius[0])*1.5, sqrt(subsurface_scattering.radius[1])*1.5, sqrt(subsurface_scattering.radius[2])*1.5, 1-subsurface_scattering.color[0], 1-subsurface_scattering.color[1], 1-subsurface_scattering.color[2]))

                if material.pov_irid_enable:
                    tabWrite('irid { %.4g thickness %.4g turbulence %.4g }' % (material.pov_irid_amount, material.pov_irid_thickness, material.pov_irid_turbulence))

            else:
                tabWrite('diffuse 0.8\n')
                tabWrite('phong 70.0\n')
                
                #tabWrite('specular 0.2\n')


            # This is written into the object
            '''
            if material and material.transparency_method=='RAYTRACE':
                'interior { ior %.3g} ' % material.raytrace_transparency.ior
            '''

            #tabWrite('crand 1.0\n') # Sand granyness
            #tabWrite('metallic %.6f\n' % material.spec)
            #tabWrite('phong %.6f\n' % material.spec)
            #tabWrite('phong_size %.6f\n' % material.spec)
            #tabWrite('brilliance %.6f ' % (material.specular_hardness/256.0) # Like hardness

            tabWrite('}\n\n')

        # Level=1 Means No specular nor Mirror reflection
        povHasnoSpecularMaps(Level=1)

        # Level=2 Means translation of spec and mir levels for when no map influences them
        povHasnoSpecularMaps(Level=2)
        
        # Level=3 Means Maximum Spec and Mirror
        povHasnoSpecularMaps(Level=3)

    def exportCamera():
        camera = scene.camera
        
        # DH disabled for now, this isn't the correct context
        active_object = None #bpy.context.active_object # does not always work  MR
        matrix = global_matrix * camera.matrix_world
        focal_point = camera.data.dof_distance

        # compute resolution
        Qsize = float(render.resolution_x) / float(render.resolution_y)
        tabWrite('#declare camLocation  = <%.6f, %.6f, %.6f>;\n' % (matrix[3][0], matrix[3][1], matrix[3][2]))
        tabWrite('#declare camLookAt = <%.6f, %.6f, %.6f>;\n' % tuple([degrees(e) for e in matrix.rotation_part().to_euler()]))

        tabWrite('camera {\n')
        if scene.pov_baking_enable and active_object and active_object.type=='MESH':
            tabWrite('mesh_camera{ 1 3\n') # distribution 3 is what we want here
            tabWrite('mesh{%s}\n' % active_object.name)
            tabWrite('}\n')
            tabWrite('location <0,0,.01>')
            tabWrite('direction <0,0,-1>')
        # Using standard camera otherwise
        else:
            tabWrite('location  <0, 0, 0>\n')
            tabWrite('look_at  <0, 0, -1>\n')
            tabWrite('right <%s, 0, 0>\n' % - Qsize)
            tabWrite('up <0, 1, 0>\n')
            tabWrite('angle  %f \n' % (360.0 * atan(16.0 / camera.data.lens) / pi))

            tabWrite('rotate  <%.6f, %.6f, %.6f>\n' % tuple([degrees(e) for e in matrix.rotation_part().to_euler()]))
            tabWrite('translate <%.6f, %.6f, %.6f>\n' % (matrix[3][0], matrix[3][1], matrix[3][2]))
            if focal_point != 0:
                tabWrite('aperture 0.25\n') # fixed blur amount for now to do, add slider a button? 
                tabWrite('blur_samples 96 128\n')
                tabWrite('variance 1/10000\n')
                tabWrite('focal_point <0, 0, %f>\n' % focal_point)
        tabWrite('}\n')

    def exportLamps(lamps):
        # Get all lamps
        for ob in lamps:
            lamp = ob.data

            matrix = global_matrix * ob.matrix_world

            color = tuple([c * lamp.energy *2 for c in lamp.color]) # Colour is modified by energy #muiltiplie by 2 for a better match --Maurice

            tabWrite('light_source {\n')
            tabWrite('< 0,0,0 >\n')
            tabWrite('color rgb<%.3g, %.3g, %.3g>\n' % color)

            if lamp.type == 'POINT': # Point Lamp
                pass
            elif lamp.type == 'SPOT': # Spot
                tabWrite('spotlight\n')

                # Falloff is the main radius from the centre line
                tabWrite('falloff %.2f\n' % (degrees(lamp.spot_size) / 2.0)) # 1 TO 179 FOR BOTH
                tabWrite('radius %.6f\n' % ((degrees(lamp.spot_size) / 2.0) * (1.0 - lamp.spot_blend)))

                # Blender does not have a tightness equivilent, 0 is most like blender default.
                tabWrite('tightness 0\n') # 0:10f

                tabWrite('point_at  <0, 0, -1>\n')
            elif lamp.type == 'SUN':
                tabWrite('parallel\n')
                tabWrite('point_at  <0, 0, -1>\n') # *must* be after 'parallel'

            elif lamp.type == 'AREA':
                tabWrite('fade_distance %.6f\n' % (lamp.distance / 5) )
                tabWrite('fade_power %d\n' % 2) #  Area lights have no falloff type, so always use blenders lamp quad equivalent for those?
                size_x = lamp.size
                samples_x = lamp.shadow_ray_samples_x
                if lamp.shape == 'SQUARE':
                    size_y = size_x
                    samples_y = samples_x
                else:
                    size_y = lamp.size_y
                    samples_y = lamp.shadow_ray_samples_y

                tabWrite('area_light <%d,0,0>,<0,0,%d> %d, %d\n' % (size_x, size_y, samples_x, samples_y))
                if lamp.shadow_ray_sample_method == 'CONSTANT_JITTERED':
                    if lamp.jitter:
                        tabWrite('jitter\n')
                else:
                    tabWrite('adaptive 1\n')
                    tabWrite('jitter\n')

            if lamp.type == 'HEMI':#HEMI never has any shadow attribute
                tabWrite('shadowless\n')
            elif lamp.shadow_method == 'NOSHADOW':
                    tabWrite('shadowless\n')

            if lamp.type != 'SUN' and lamp.type!='AREA' and lamp.type!='HEMI':#Sun shouldn't be attenuated. Hemi and area lights have no falloff attribute so they are put to type 2 attenuation a little higher above.
                tabWrite('fade_distance %.6f\n' % (lamp.distance / 5) )
                if lamp.falloff_type == 'INVERSE_SQUARE':
                    tabWrite('fade_power %d\n' % 2) # Use blenders lamp quad equivalent
                elif lamp.falloff_type == 'INVERSE_LINEAR':
                    tabWrite('fade_power %d\n' % 1) # Use blenders lamp linear
                elif lamp.falloff_type == 'CONSTANT': #Supposing using no fade power keyword would default to constant, no attenuation.
                    pass
                elif lamp.falloff_type == 'CUSTOM_CURVE': #Using Custom curve for fade power 3 for now.
                    tabWrite('fade_power %d\n' % 4)

            writeMatrix(matrix)

            tabWrite('}\n')
##################################################################################################################################
#Wip to be Used for fresnel, but not tested yet.
##################################################################################################################################
##    lampLocation=[0,0,0]
##    lampRotation=[0,0,0]
##    lampDistance=0.00
##    averageLampLocation=[0,0,0]
##    averageLampRotation=[0,0,0]
##    averageLampDistance=0.00
##    lamps=[]
##    for l in scene.objects:
##        if l.type == 'LAMP':#get all lamps
##            lamps += [l]
##    for ob in lamps:
##        lamp = ob.data
##        lampLocation[0]+=ob.location[0]
##        lampLocation[1]+=ob.location[1]
##        lampLocation[2]+=ob.location[2]
##        lampRotation[0]+=ob.rotation_euler[0]
##        lampRotation[1]+=ob.rotation_euler[1]
##        lampRotation[2]+=ob.rotation_euler[2]
##        lampDistance+=ob.data.distance
##        averageLampRotation[0]=lampRotation[0] / len(lamps)#create an average direction for all lamps.
##        averageLampRotation[1]=lampRotation[1] / len(lamps)#create an average direction for all lamps.
##        averageLampRotation[2]=lampRotation[2] / len(lamps)#create an average direction for all lamps.
##
##        averageLampLocation[0]=lampLocation[0] / len(lamps)#create an average position for all lamps.
##        averageLampLocation[1]=lampLocation[1] / len(lamps)#create an average position for all lamps.
##        averageLampLocation[2]=lampLocation[2] / len(lamps)#create an average position for all lamps.
##        
##        averageLampDistance=lampDistance / len(lamps)#create an average distance for all lamps.
##    file.write('\n#declare lampTarget= vrotate(<%.4g,%.4g,%.4g>,<%.4g,%.4g,%.4g>);' % (-(averageLampLocation[0]-averageLampDistance), -(averageLampLocation[1]-averageLampDistance), -(averageLampLocation[2]-averageLampDistance), averageLampRotation[0], averageLampRotation[1], averageLampRotation[2]))
##    #v(A,B) rotates vector A about origin by vector B.    
##
####################################################################################################################################

    def exportMeta(metas):

        # TODO - blenders 'motherball' naming is not supported.

        for ob in metas:
            meta = ob.data
            importance=ob.pov_importance_value              

            tabWrite('blob {\n')
            tabWrite('threshold %.4g\n' % meta.threshold)

            try:
                material = meta.materials[0] # lame! - blender cant do enything else.
            except:
                material = None

            for elem in meta.elements:

                if elem.type not in ('BALL', 'ELLIPSOID'):
                    continue # Not supported

                loc = elem.co

                stiffness = elem.stiffness
                if elem.use_negative:
                    stiffness = - stiffness

                if elem.type == 'BALL':

                    tabWrite('sphere { <%.6g, %.6g, %.6g>, %.4g, %.4g ' % (loc.x, loc.y, loc.z, elem.radius, stiffness))

                    # After this wecould do something simple like...
                    # 	'pigment {Blue} }'
                    # except we'll write the color

                elif elem.type == 'ELLIPSOID':
                    # location is modified by scale
                    tabWrite('sphere { <%.6g, %.6g, %.6g>, %.4g, %.4g ' % (loc.x / elem.size_x, loc.y / elem.size_y, loc.z / elem.size_z, elem.radius, stiffness))
                    tabWrite('scale <%.6g, %.6g, %.6g> ' % (elem.size_x, elem.size_y, elem.size_z))

                if material:
                    diffuse_color = material.diffuse_color

                    if material.use_transparency and material.transparency_method == 'RAYTRACE':
                        trans = 1.0 - material.raytrace_transparency.filter
                    else:
                        trans = 0.0

                    material_finish = materialNames[material.name]

                    tabWrite('pigment {rgbft<%.3g, %.3g, %.3g, %.3g, %.3g>} finish {%s} }\n' % \
                        (diffuse_color[0], diffuse_color[1], diffuse_color[2], 1.0 - material.alpha, trans, safety(material_finish, Level=2)))

                else:
                    tabWrite('pigment {rgb<1 1 1>} finish {%s} }\n' % DEF_MAT_NAME)		# Write the finish last.

            writeObjectMaterial(material)

            writeMatrix(global_matrix * ob.matrix_world)
            #Importance for radiosity sampling added here: 
            tabWrite('radiosity { \n')
            tabWrite('importance %3g \n' % importance)
            tabWrite('}\n')
            
            tabWrite('}\n') #End of Metaball block

            tabWrite('}\n')

    objectNames = {}
    DEF_OBJ_NAME = 'Default'
    def exportMeshs(scene, sel):

        ob_num = 0

        for ob in sel:
            ob_num += 1
#############################################
            #Generating a name for object just like materials to be able to use it (baking for now or anything else).
            if sel:
                name_orig = ob.name
            else:
                name_orig = DEF_OBJ_NAME
            name = objectNames[name_orig] = uniqueName(bpy.path.clean_name(name_orig), objectNames)
#############################################
            if ob.type in ('LAMP', 'CAMERA', 'EMPTY', 'META', 'ARMATURE', 'LATTICE'):
                continue

            me = ob.data
            importance=ob.pov_importance_value            
            me_materials = me.materials

            me = ob.create_mesh(scene, True, 'RENDER')

            if not me or not me.faces:
                continue

            if info_callback:
                info_callback('Object %2.d of %2.d (%s)' % (ob_num, len(sel), ob.name))

            #if ob.type!='MESH':
            #	continue
            # me = ob.data

            matrix = global_matrix * ob.matrix_world
            try:
                uv_layer = me.uv_textures.active.data
            except AttributeError:
                uv_layer = None

            try:
                vcol_layer = me.vertex_colors.active.data
            except AttributeError:
                vcol_layer = None

            faces_verts = [f.vertices[:] for f in me.faces]
            faces_normals = [tuple(f.normal) for f in me.faces]
            verts_normals = [tuple(v.normal) for v in me.vertices]

            # quads incur an extra face
            quadCount = sum(1 for f in faces_verts if len(f) == 4)

            # Use named declaration to allow reference e.g. for baking. MR
            tabWrite('#declare %s=\n' % name) 
            tabWrite('mesh2 {\n')
            tabWrite('vertex_vectors {\n')
            tabWrite('%s' % (len(me.vertices))) # vert count
            
            for v in me.vertices:
                file.write(',\n')
                tabWrite('<%.6f, %.6f, %.6f>' % tuple(v.co)) # vert count
            file.write('\n')
            tabWrite('}\n')


            # Build unique Normal list
            uniqueNormals = {}
            for fi, f in enumerate(me.faces):
                fv = faces_verts[fi]
                # [-1] is a dummy index, use a list so we can modify in place
                if f.use_smooth: # Use vertex normals
                    for v in fv:
                        key = verts_normals[v]
                        uniqueNormals[key] = [-1]
                else: # Use face normal
                    key = faces_normals[fi]
                    uniqueNormals[key] = [-1]

            tabWrite('normal_vectors {\n')
            tabWrite('%d' % len(uniqueNormals)) # vert count
            idx = 0
            for no, index in uniqueNormals.items():
                file.write(',\n')
                tabWrite('<%.6f, %.6f, %.6f>' % no) # vert count
                index[0] = idx
                idx += 1
            file.write('\n')
            tabWrite('}\n')


            # Vertex colours
            vertCols = {} # Use for material colours also.

            if uv_layer:
                # Generate unique UV's
                uniqueUVs = {}

                for fi, uv in enumerate(uv_layer):

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

                    for uv in uvs:
                        uniqueUVs[tuple(uv)] = [-1]

                tabWrite('uv_vectors {\n')
                #print unique_uvs
                tabWrite('%s' % (len(uniqueUVs))) # vert count
                idx = 0
                for uv, index in uniqueUVs.items():
                    file.write(',\n')
                    tabWrite('<%.6f, %.6f>' % uv)
                    index[0] = idx
                    idx += 1
                '''
                else:
                    # Just add 1 dummy vector, no real UV's
                    tabWrite('1') # vert count
                    file.write(',\n\t\t<0.0, 0.0>')
                '''
                file.write('\n')
                tabWrite('}\n')


            if me.vertex_colors:

                for fi, f in enumerate(me.faces):
                    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 = tuple(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 = tuple(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')
            tabWrite('%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

                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




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


                ##############################################################################################################
                if material.diffuse_shader == 'MINNAERT':
                    tabWrite('\n')
                    tabWrite('aoi\n')
                    tabWrite('texture_map {\n')
                    tabWrite('[%.3g finish {diffuse %.3g}]\n' % ((material.darkness/2), (2-material.darkness)))
                    tabWrite('[%.3g' % (1-(material.darkness/2)))
######TO OPTIMIZE? or present a more elegant way? At least make it work!##################################################################
                #If Fresnel gets removed from 2.5, why bother?
                if material.diffuse_shader == 'FRESNEL':
                    
######END of part TO OPTIMIZE? or present a more elegant way?##################################################################

##                        #lampLocation=lamp.position
##                        lampRotation=
##                        a=lamp.Rotation[0]
##                        b=lamp.Rotation[1]
##                        c=lamp.Rotation[2]
##                        lampLookAt=tuple (x,y,z)
##                        lampLookAt[3]= 0.0 #Put 'target' of the lamp on the floor plane to elimianate one unknown value
##                                   degrees(atan((lampLocation - lampLookAt).y/(lampLocation - lampLookAt).z))=lamp.rotation[0]
##                                   degrees(atan((lampLocation - lampLookAt).z/(lampLocation - lampLookAt).x))=lamp.rotation[1]
##                                   degrees(atan((lampLocation - lampLookAt).x/(lampLocation - lampLookAt).y))=lamp.rotation[2]
##                        degrees(atan((lampLocation - lampLookAt).y/(lampLocation.z))=lamp.rotation[0]
##                        degrees(atan((lampLocation.z/(lampLocation - lampLookAt).x))=lamp.rotation[1]
##                        degrees(atan((lampLocation - lampLookAt).x/(lampLocation - lampLookAt).y))=lamp.rotation[2]
                     

                                #color = tuple([c * lamp.energy for c in lamp.color]) # Colour is modified by energy                        
                        
                    tabWrite('\n')
                    tabWrite('slope { lampTarget }\n')
                    tabWrite('texture_map {\n')
                    tabWrite('[%.3g finish {diffuse %.3g}]\n' % ((material.diffuse_fresnel/2), (2-material.diffuse_fresnel_factor)))
                    tabWrite('[%.3g\n' % (1-(material.diffuse_fresnel/2)))
              
                
                #if material.diffuse_shader == 'FRESNEL': pigment pattern aoi pigment and texture map above, the rest below as one of its entry
                ##########################################################################################################################            
                if texturesSpec !='':
                    tabWrite('\n')
                    tabWrite('pigment_pattern {\n')
                    mappingSpec = (' translate <%.4g-0.75,%.4g-0.75,%.4g-0.75> scale <%.4g,%.4g,%.4g>\n' % (t_spec.offset.x / 10 ,t_spec.offset.y / 10 ,t_spec.offset.z / 10, t_spec.scale.x / 2.25, t_spec.scale.y / 2.25, t_spec.scale.z / 2.25)) #strange that the translation factor for scale is not the same as for translate. ToDo: verify both matches with blender internal. 
                    tabWrite('uv_mapping image_map{%s \"%s\" %s}%s}\n' % (imageFormat(texturesSpec) ,texturesSpec ,imgMap(t_spec),mappingSpec))
                    tabWrite('texture_map {\n')
                    tabWrite('[0 \n')

                if texturesDif == '':
                    if texturesAlpha !='':
                        tabWrite('\n')
                        mappingAlpha = (' translate <%.4g-0.75,%.4g-0.75,%.4g-0.75> scale <%.4g,%.4g,%.4g>\n' % (t_alpha.offset.x / 10 ,t_alpha.offset.y / 10 ,t_alpha.offset.z / 10, t_alpha.scale.x / 2.25, t_alpha.scale.y / 2.25, t_alpha.scale.z / 2.25)) #strange that the translation factor for scale is not the same as for translate. ToDo: verify both matches with blender internal. 
                        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], 1.0 - material.alpha, trans) )
                        tabWrite('}\n')
                        tabWrite('}\n')

                    else:

                        tabWrite('pigment {rgbft<%.3g, %.3g, %.3g, %.3g, %.3g>}\n' % (col[0], col[1], col[2], 1.0 - material.alpha, trans))

                    if texturesSpec !='':
                        tabWrite('finish {%s}\n' % (safety(material_finish, Level=1)))# Level 1 is no specular
                        
                    else:
                        tabWrite('finish {%s}\n' % (safety(material_finish, Level=2)))# Level 2 is translated spec

                else:
                    mappingDif = (' translate <%.4g-0.75,%.4g-0.75,%.4g-0.75> scale <%.4g,%.4g,%.4g>\n' % (t_dif.offset.x / 10 ,t_dif.offset.y / 10 ,t_dif.offset.z / 10, t_dif.scale.x / 2.25, t_dif.scale.y / 2.25, t_dif.scale.z / 2.25)) #strange that the translation factor for scale is not the same as for translate. ToDo: verify both matches with blender internal. 
                    if texturesAlpha !='':
                        mappingAlpha = (' translate <%.4g-0.75,%.4g-0.75,%.4g-0.75> scale <%.4g,%.4g,%.4g>\n' % (t_alpha.offset.x / 10 ,t_alpha.offset.y / 10 ,t_alpha.offset.z / 10, t_alpha.scale.x / 2.25, t_alpha.scale.y / 2.25, t_alpha.scale.z / 2.25)) #strange that the translation factor for scale is not the same as for translate. ToDo: verify both matches with blender internal. 
                        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,(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 !='':
                        tabWrite('finish {%s}\n' % (safety(material_finish, Level=1)))# Level 1 is no specular
                            
                    else:
                        tabWrite('finish {%s}\n' % (safety(material_finish, Level=2)))# Level 2 is translated specular

                    ## 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
                    mappingNor = (' translate <%.4g-0.75,%.4g-0.75,%.4g-0.75> scale <%.4g,%.4g,%.4g>\n' % (t_nor.offset.x / 10 ,t_nor.offset.y / 10 ,t_nor.offset.z / 10, t_nor.scale.x / 2.25, t_nor.scale.y / 2.25, t_nor.scale.z / 2.25))
                    #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 == '':
                    if texturesAlpha !='':
                        mappingAlpha = (' translate <%.4g-0.75,%.4g-0.75,%.4g-0.75> scale <%.4g,%.4g,%.4g>\n' % (t_alpha.offset.x / 10 ,t_alpha.offset.y / 10 ,t_alpha.offset.z / 10, t_alpha.scale.x / 2.25, t_alpha.scale.y / 2.25, t_alpha.scale.z / 2.25)) #strange that the translation factor for scale is not the same as for translate. ToDo: verify both matches with blender internal. 
                        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], 1.0 - material.alpha, trans))
                        tabWrite('}\n')
                        tabWrite('}\n')

                    else:
                        tabWrite('pigment {rgbft<%.3g, %.3g, %.3g, %.3g, %.3g>}\n' % (col[0], col[1], col[2], 1.0 - material.alpha, trans))

                    if texturesSpec !='':
                        tabWrite('finish {%s}\n' % (safety(material_finish, Level=3)))# Level 3 is full specular
                        
                    else:
                        tabWrite('finish {%s}\n' % (safety(material_finish, Level=2)))# Level 2 is translated specular

                else:
                    mappingDif = (' translate <%.4g-0.75,%.4g-0.75,%.4g-0.75> scale <%.4g,%.4g,%.4g>\n' % (t_dif.offset.x / 10 ,t_dif.offset.y / 10 ,t_dif.offset.z / 10, t_dif.scale.x / 2.25, t_dif.scale.y / 2.25, t_dif.scale.z / 2.25)) #strange that the translation factor for scale is not the same as for translate. ToDo: verify both matches with blender internal.
                    if texturesAlpha !='':
                        mappingAlpha = (' translate <%.4g-0.75,%.4g-0.75,%.4g-0.75> scale <%.4g,%.4g,%.4g>\n' % (t_alpha.offset.x / 10 ,t_alpha.offset.y / 10 ,t_alpha.offset.z / 10, t_alpha.scale.x / 2.25, t_alpha.scale.y / 2.25, t_alpha.scale.z / 2.25)) #strange that the translation factor for scale is not the same as for translate. ToDo: verify both matches with blender internal. 
                        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))