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.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# #**** END GPL LICENSE BLOCK #****

# <pep8 compliant>

import bpy
import subprocess
import os
import sys
import time
from math import atan, pi, degrees, sqrt, cos, sin
import re
import random
import platform#
import subprocess#
from bpy.types import(Operator)


from . import df3 # for smoke rendering
from . import shading # for BI POV haders emulation
from . import primitives # for import and export of POV specific primitives
##############################SF###########################
##############find image texture
def imageFormat(imgF):
    ext = {
        'JPG': "jpeg",
        'JPEG': "jpeg",
        'GIF': "gif",
        'TGA': "tga",
        'IFF': "iff",
        'PPM': "ppm",
        'PNG': "png",
        'SYS': "sys",
        'TIFF': "tiff",
        'TIF': "tiff",
        'EXR': "exr",
        'HDR': "hdr",
    }.get(os.path.splitext(imgF)[-1].upper(), "")

    #if not ext:
        #print(" WARNING: texture image has no extension") #too verbose 

    return ext


def imgMap(ts):
    image_map = ""
    if ts.mapping == 'FLAT':
        image_map = "map_type 0 "
    elif ts.mapping == 'SPHERE':
        image_map = "map_type 1 " 
    elif ts.mapping == 'TUBE':
        image_map = "map_type 2 "

    ## map_type 3 and 4 in development (?)
    ## for POV-Ray, currently they just seem to default back to Flat (type 0)
    #elif ts.mapping=="?":
    #    image_map = " map_type 3 "
    #elif ts.mapping=="?":
    #    image_map = " map_type 4 "
    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 imgMapTransforms(ts):
    # XXX TODO: unchecked textures give error of variable referenced before assignment XXX
    # POV-Ray "scale" is not a number of repetitions factor, but ,its
    # inverse, a standard scale factor.
    # 0.5 Offset is needed relatively to scale because center of the
    # scale is 0.5,0.5 in blender and 0,0 in POV
    image_map_transforms = ""
    image_map_transforms = ("scale <%.4g,%.4g,%.4g> translate <%.4g,%.4g,%.4g>" % \
                  ( 1.0 / ts.scale.x,
                  1.0 / ts.scale.y,
                  1.0 / ts.scale.z,
                  0.5-(0.5/ts.scale.x) - (ts.offset.x),
                  0.5-(0.5/ts.scale.y) - (ts.offset.y),
                  ts.offset.z))    
    # image_map_transforms = (" translate <-0.5,-0.5,0.0> scale <%.4g,%.4g,%.4g> translate <%.4g,%.4g,%.4g>" % \
                  # ( 1.0 / ts.scale.x,
                  # 1.0 / ts.scale.y,
                  # 1.0 / ts.scale.z,
                  # (0.5 / ts.scale.x) + ts.offset.x,
                  # (0.5 / ts.scale.y) + ts.offset.y,
                  # ts.offset.z))
    # image_map_transforms = ("translate <-0.5,-0.5,0> scale <-1,-1,1> * <%.4g,%.4g,%.4g> translate <0.5,0.5,0> + <%.4g,%.4g,%.4g>" % \
                  # (1.0 / ts.scale.x, 
                  # 1.0 / ts.scale.y,
                  # 1.0 / ts.scale.z,
                  # ts.offset.x,
                  # ts.offset.y,
                  # ts.offset.z))
    return image_map_transforms

def imgMapBG(wts):
    image_mapBG = ""
    # texture_coords refers to the mapping of world textures:
    if wts.texture_coords == 'VIEW' or wts.texture_coords == 'GLOBAL':
        image_mapBG = " map_type 0 "
    elif wts.texture_coords == 'ANGMAP':
        image_mapBG = " map_type 1 "
    elif 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 path_image(image):
    return bpy.path.abspath(image.filepath, library=image.library).replace("\\","/")
    # .replace("\\","/") to get only forward slashes as it's what POV prefers, 
    # even on windows
# end find image texture
# -----------------------------------------------------------------------------


def string_strip_hyphen(name):
    return name.replace("-", "")


def safety(name, Level):
    # safety string name material
    #
    # 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 = string_strip_hyphen(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###########################

def is_renderable(ob):
    return (ob.hide_render==False)


def renderable_objects():
    return [ob for ob in bpy.data.objects if is_renderable(ob)]


tabLevel = 0
unpacked_images=[]

user_dir = bpy.utils.resource_path('USER')
preview_dir = os.path.join(user_dir, "preview")

## Make sure Preview directory exists and is empty
smokePath = os.path.join(preview_dir, "smoke.df3")

def write_global_setting(scene,file):
    file.write("global_settings {\n")
    file.write("    assumed_gamma %.6f\n"%scene.pov.assumed_gamma)
    if scene.pov.global_settings_default == False:
        if scene.pov.adc_bailout_enable and scene.pov.radio_enable == False:
            file.write("    adc_bailout %.6f\n"%scene.pov.adc_bailout)
        if scene.pov.ambient_light_enable:
            file.write("    ambient_light <%.6f,%.6f,%.6f>\n"%scene.pov.ambient_light[:])
        if scene.pov.irid_wavelength_enable:
            file.write("    irid_wavelength <%.6f,%.6f,%.6f>\n"%scene.pov.irid_wavelength[:])
        if scene.pov.charset_enable:
            file.write("    charset %s\n"%scene.pov.charset)
        if scene.pov.max_trace_level_enable:
            file.write("    max_trace_level %s\n"%scene.pov.max_trace_level)    
        if scene.pov.max_intersections_enable:
            file.write("    max_intersections %s\n"%scene.pov.max_intersections)
        if scene.pov.number_of_waves_enable:
            file.write("    number_of_waves %s\n"%scene.pov.number_of_waves)
        if scene.pov.noise_generator_enable:
            file.write("    noise_generator %s\n"%scene.pov.noise_generator) 
    if scene.pov.sslt_enable:
        file.write("    mm_per_unit %s\n"%scene.pov.mm_per_unit) 
        file.write("    subsurface {\n")
        file.write("        samples %s, %s\n"%(scene.pov.sslt_samples_max,scene.pov.sslt_samples_min))
        if scene.pov.sslt_radiosity:
            file.write("        radiosity on\n")
        file.write("}\n")

    if scene.pov.radio_enable:
        file.write("    radiosity {\n")
        file.write("        pretrace_start %.6f\n"%scene.pov.radio_pretrace_start) 
        file.write("        pretrace_end %.6f\n"%scene.pov.radio_pretrace_end) 
        file.write("        count %s\n"%scene.pov.radio_count) 
        file.write("        nearest_count %s\n"%scene.pov.radio_nearest_count) 
        file.write("        error_bound %.6f\n"%scene.pov.radio_error_bound)         
        file.write("        recursion_limit %s\n"%scene.pov.radio_recursion_limit) 
        file.write("        low_error_factor %.6f\n"%scene.pov.radio_low_error_factor) 
        file.write("        gray_threshold %.6f\n"%scene.pov.radio_gray_threshold) 
        file.write("        maximum_reuse %.6f\n"%scene.pov.radio_maximum_reuse) 
        file.write("        minimum_reuse %.6f\n"%scene.pov.radio_minimum_reuse) 
        file.write("        brightness %.6f\n"%scene.pov.radio_brightness) 
        file.write("        adc_bailout %.6f\n"%scene.pov.radio_adc_bailout)
        if scene.pov.radio_normal:
            file.write("        normal on\n") 
        if scene.pov.radio_always_sample:
            file.write("        always_sample on\n") 
        if scene.pov.radio_media:
            file.write("        media on\n") 
        if scene.pov.radio_subsurface:
            file.write("        subsurface on\n")
        file.write("    }\n")

    if scene.pov.photon_enable:
        file.write("    photons {\n")
        if scene.pov.photon_enable_count:
            file.write("        count %s\n"%scene.pov.photon_count)
        else:
            file.write("        spacing %.6g\n"%scene.pov.photon_spacing)
        if scene.pov.photon_gather:
            file.write("        gather %s, %s\n"%(scene.pov.photon_gather_min,scene.pov.photon_gather_max))
        if scene.pov.photon_autostop:
            file.write("        autostop %.4g\n"%scene.pov.photon_autostop_value)
        if scene.pov.photon_jitter_enable:
            file.write("        jitter %.4g\n"%scene.pov.photon_jitter)
        file.write("        max_trace_level %s\n"%scene.pov.photon_max_trace_level)
        if scene.pov.photon_adc:
            file.write("        adc_bailout %.6f\n"%scene.pov.photon_adc_bailout)
        if scene.pov.photon_media_enable:
            file.write("        media %s, %s\n"%(scene.pov.photon_media_steps,scene.pov.photon_media_factor))
        if scene.pov.photon_savefile or scene.pov.photon_loadfile:
            filePh = bpy.path.abspath(scene.pov.photon_map_file)
            if scene.pov.photon_savefile:
                file.write('save_file "%s"\n'%filePh)
            if scene.pov.photon_loadfile and os.path.exists(filePh):
                file.write('load_file "%s"\n'%filePh)
        file.write("}\n")
    file.write("}\n")

def write_object_modifiers(scene,ob,File):
    if ob.pov.hollow:
        File.write("hollow\n")
    if ob.pov.double_illuminate:
        File.write("double_illuminate\n")
    if ob.pov.sturm:
        File.write("sturm\n")
    if ob.pov.no_shadow:
        File.write("no_shadow\n")
    if ob.pov.no_image:
        File.write("no_image\n")
    if ob.pov.no_reflection:
        File.write("no_reflection\n")
    if ob.pov.no_radiosity:
        File.write("no_radiosity\n")
    if ob.pov.inverse:
        File.write("inverse\n")
    if ob.pov.hierarchy:
        File.write("hierarchy\n")
    if scene.pov.photon_enable:
        File.write("photons {\n")
        if ob.pov.target:
            File.write("target %.4g\n"%ob.pov.target_value)
        if ob.pov.refraction:
            File.write("refraction on\n")
        if ob.pov.reflection:
            File.write("reflection on\n")
        if ob.pov.pass_through:
            File.write("pass_through\n")
        File.write("}\n")
    # if ob.pov.object_ior > 1:
        # File.write("interior {\n")
        # File.write("ior %.4g\n"%ob.pov.object_ior)
        # if scene.pov.photon_enable and ob.pov.target and ob.pov.refraction and ob.pov.dispersion:
            # File.write("ior %.4g\n"%ob.pov.dispersion_value)
            # File.write("ior %s\n"%ob.pov.dispersion_samples) 
        # if scene.pov.photon_enable == False:
            # File.write("caustics %.4g\n"%ob.pov.fake_caustics_power)
    


def write_pov(filename, scene=None, info_callback=None):
    import mathutils
    #file = filename
    file = open(filename, "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')
    comments = scene.pov.comments_enable and not scene.pov.tempfiles_enable
    linebreaksinlists = scene.pov.list_lf_enable and not scene.pov.tempfiles_enable
    feature_set = bpy.context.user_preferences.addons[__package__].preferences.branch_feature_set_povray
    using_uberpov = (feature_set=='uberpov')
    pov_binary = PovrayRender._locate_binary()

    if using_uberpov:
        print("Unofficial UberPOV feature set chosen in preferences")
    else:
        print("Official POV-Ray 3.7 feature set chosen in preferences")
    if 'uber' in pov_binary: 
        print("The name of the binary suggests you are probably rendering with Uber POV engine")
    else:
        print("The name of the binary suggests you are probably rendering with standard POV engine")
    def setTab(tabtype, spaces):
        TabStr = ""
        if tabtype == 'NONE':
            TabStr = ""
        elif tabtype == 'TAB':
            TabStr = "\t"
        elif tabtype == 'SPACE':
            TabStr = spaces * " "
        return TabStr

    tab = setTab(scene.pov.indentation_character, scene.pov.indentation_spaces)
    if not scene.pov.tempfiles_enable:
        def tabWrite(str_o):
            global tabLevel
            brackets = str_o.count("{") - str_o.count("}") + 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
    else:
        def tabWrite(str_o):
            file.write(str_o)

    def uniqueName(name, nameSeq):

        if name not in nameSeq:
            name = string_strip_hyphen(name)
            return name

        name_orig = name
        i = 1
        while name in nameSeq:
            name = "%s_%.3d" % (name_orig, i)
            i += 1
        name = string_strip_hyphen(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[1][0], matrix[2][0],
                  matrix[0][1], matrix[1][1], matrix[2][1],
                  matrix[0][2], matrix[1][2], matrix[2][2],
                  matrix[0][3], matrix[1][3], matrix[2][3]))

    def MatrixAsPovString(matrix):
        sMatrix = ("matrix <%.6f, %.6f, %.6f,  %.6f, %.6f, %.6f,  %.6f, %.6f, %.6f,  %.6f, %.6f, %.6f>\n" %
                   (matrix[0][0], matrix[1][0], matrix[2][0],
                    matrix[0][1], matrix[1][1], matrix[2][1],
                    matrix[0][2], matrix[1][2], matrix[2][2],
                    matrix[0][3], matrix[1][3], matrix[2][3]))
        return sMatrix

    def writeObjectMaterial(material, ob):

        # DH - modified some variables to be function local, avoiding RNA write
        # this should be checked to see if it is functionally correct

        # Commented out: always write IOR to be able to use it for SSS, Fresnel reflections...
        #if material and material.transparency_method == 'RAYTRACE':
        if material:
            # 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)
            # Then the raytrace IOR taken from raytrace transparency properties and used for
            # reflections if IOR Mirror option is checked.
            elif material.pov.mirror_use_IOR:
                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.photons_reflection:
                pov_photons_reflection = True
            if not material.pov.refraction_caustics:
                pov_fake_caustics = False
                pov_photons_refraction = False
            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:
                    # Default of 1 means no dispersion
                    tabWrite("dispersion %.6f\n" % material.pov.photons_dispersion)
                    tabWrite("dispersion_samples %.d\n" % material.pov.photons_dispersion_samples)
            #TODO
            # Other interior args
            if material.use_transparency and material.transparency_method == 'RAYTRACE':
                # fade_distance
                # In Blender this value has always been reversed compared to what tooltip says.
                # 100.001 rather than 100 so that it does not get to 0
                # which deactivates the feature in POV
                tabWrite("fade_distance %.3g\n" % \
                         (100.001 - material.raytrace_transparency.depth_max))
                # fade_power
                tabWrite("fade_power %.3g\n" % material.raytrace_transparency.falloff)
                # fade_color
                tabWrite("fade_color <%.3g, %.3g, %.3g>\n" % material.pov.interior_fade_color[:])

            # (variable) dispersion_samples (constant count for now)
            tabWrite("}\n")
            if material.pov.photons_reflection or material.pov.refraction_type=="2":
                tabWrite("photons{")
                tabWrite("target %.3g\n" % ob.pov.spacing_multiplier)
                if not ob.pov.collect_photons:
                    tabWrite("collect off\n")
                if pov_photons_refraction:
                    tabWrite("refraction on\n")
                if pov_photons_reflection:
                    tabWrite("reflection on\n")
                tabWrite("}\n")

    materialNames = {}
    DEF_MAT_NAME = "" #or "Default"?
    
    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 = render.resolution_x / render.resolution_y
        tabWrite("#declare camLocation  = <%.6f, %.6f, %.6f>;\n" %
                 matrix.translation[:])
        tabWrite("#declare camLookAt = <%.6f, %.6f, %.6f>;\n" %
                 tuple([degrees(e) for e in matrix.to_3x3().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.to_3x3().to_euler()]))
            tabWrite("translate <%.6f, %.6f, %.6f>\n" % matrix.translation[:])
            if camera.data.pov.dof_enable and focal_point != 0:
                tabWrite("aperture %.3g\n" % camera.data.pov.dof_aperture)
                tabWrite("blur_samples %d %d\n" % \
                         (camera.data.pov.dof_samples_min, camera.data.pov.dof_samples_max))
                tabWrite("variance 1/%d\n" % camera.data.pov.dof_variance)
                tabWrite("confidence %.3g\n" % camera.data.pov.dof_confidence)
                tabWrite("focal_point <0, 0, %f>\n" % focal_point)
        tabWrite("}\n")

        
        
    def exportLamps(lamps):
        # Incremented after each lamp export to declare its target
        # currently used for Fresnel diffuse shader as their slope vector:
        global lampCount
        lampCount = 0
        # Get all lamps
        for ob in lamps:
            lamp = ob.data

            matrix = global_matrix * ob.matrix_world

            # Color is modified by energy #muiltiplie by 2 for a better match --Maurice
            color = tuple([c * lamp.energy * 2.0 for c in lamp.color])

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

            if lamp.type == 'POINT':
                pass
            elif lamp.type == '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("area_illumination\n")
                tabWrite("fade_distance %.6f\n" % (lamp.distance / 2.0))
                # Area lights have no falloff type, so always use blenders lamp quad equivalent
                # for those?
                tabWrite("fade_power %d\n" % 2)
                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 <%.6f,0,0>,<0,%.6f,0> %d, %d\n" % \
                         (size_x, size_y, samples_x, samples_y))
                if lamp.shadow_ray_sample_method == 'CONSTANT_JITTERED':
                    if lamp.use_jitter:
                        tabWrite("jitter\n")
                else:
                    tabWrite("adaptive 1\n")
                    tabWrite("jitter\n")

            # HEMI never has any shadow_method attribute
            if(not scene.render.use_shadows or lamp.type == 'HEMI' or
               (lamp.type != 'HEMI' and lamp.shadow_method == 'NOSHADOW')):
                tabWrite("shadowless\n")

            # 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.
            if lamp.type not in {'SUN', 'AREA', 'HEMI'}:
                tabWrite("fade_distance %.6f\n" % (lamp.distance / 2.0))
                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
                # supposing using no fade power keyword would default to constant, no attenuation.
                elif lamp.falloff_type == 'CONSTANT':
                    pass
                # Using Custom curve for fade power 3 for now.
                elif lamp.falloff_type == 'CUSTOM_CURVE':
                    tabWrite("fade_power %d\n" % 4)

            writeMatrix(matrix)

            tabWrite("}\n")

            lampCount += 1

            # v(A,B) rotates vector A about origin by vector B.
            file.write("#declare lampTarget%s= vrotate(<%.4g,%.4g,%.4g>,<%.4g,%.4g,%.4g>);\n" % \
                       (lampCount, -(ob.location.x), -(ob.location.y), -(ob.location.z),
                        ob.rotation_euler.x, ob.rotation_euler.y, ob.rotation_euler.z))

####################################################################################################
    def exportRainbows(rainbows):
        for ob in rainbows:
            povdataname = ob.data.name #enough?
            angle = degrees(ob.data.spot_size/2.5) #radians in blender (2
            width = ob.data.spot_blend *10
            distance = ob.data.shadow_buffer_clip_start 
            #eps=0.0000001
            #angle = br/(cr+eps) * 10 #eps is small epsilon variable to avoid dividing by zero
            #width = ob.dimensions[2] #now let's say width of rainbow is the actual proxy height
            # formerly:
            #cz-bz # let's say width of the rainbow is height of the cone (interfacing choice
            
            # v(A,B) rotates vector A about origin by vector B.
            # and avoid a 0 length vector by adding 1
            
            # file.write("#declare %s_Target= vrotate(<%.6g,%.6g,%.6g>,<%.4g,%.4g,%.4g>);\n" % \
                       # (povdataname, -(ob.location.x+0.1), -(ob.location.y+0.1), -(ob.location.z+0.1),
                        # ob.rotation_euler.x, ob.rotation_euler.y, ob.rotation_euler.z))                    
            
            direction = (ob.location.x,ob.location.y,ob.location.z) # not taking matrix into account
            rmatrix = global_matrix * ob.matrix_world
            
            #ob.rotation_euler.to_matrix().to_4x4() * mathutils.Vector((0,0,1))
            # XXX Is result of the below offset by 90 degrees?
            up =ob.matrix_world.to_3x3()[1].xyz #* global_matrix 


            # XXX TO CHANGE: 
            #formerly:
            #tabWrite("#declare %s = rainbow {\n"%povdataname) 
            
            # clumsy for now but remove the rainbow from instancing
            # system because not an object. use lamps later instead of meshes
            
            #del data_ref[dataname]
            tabWrite("rainbow {\n")

            tabWrite("angle %.4f\n"%angle)
            tabWrite("width %.4f\n"%width)
            tabWrite("distance %.4f\n"%distance)
            tabWrite("arc_angle %.4f\n"%ob.pov.arc_angle)
            tabWrite("falloff_angle %.4f\n"%ob.pov.falloff_angle)
            tabWrite("direction <%.4f,%.4f,%.4f>\n"%rmatrix.translation[:])
            tabWrite("up <%.4f,%.4f,%.4f>\n"%(up[0],up[1],up[2]))
            tabWrite("color_map {\n")
            tabWrite("[0.000  color rgbt<1.0, 0.5, 1.0, 1.0>]\n")
            tabWrite("[0.130  color rgbt<0.5, 0.5, 1.0, 0.9>]\n")
            tabWrite("[0.298  color rgbt<0.2, 0.2, 1.0, 0.7>]\n")
            tabWrite("[0.412  color rgbt<0.2, 1.0, 1.0, 0.4>]\n")
            tabWrite("[0.526  color rgbt<0.2, 1.0, 0.2, 0.4>]\n")
            tabWrite("[0.640  color rgbt<1.0, 1.0, 0.2, 0.4>]\n")
            tabWrite("[0.754  color rgbt<1.0, 0.5, 0.2, 0.6>]\n")
            tabWrite("[0.900  color rgbt<1.0, 0.2, 0.2, 0.7>]\n")
            tabWrite("[1.000  color rgbt<1.0, 0.2, 0.2, 1.0>]\n")
            tabWrite("}\n")
            
            
            povMatName = "Default_texture"
            #tabWrite("texture {%s}\n"%povMatName)
            write_object_modifiers(scene,ob,file)
            #tabWrite("rotate x*90\n")
            #matrix = global_matrix * ob.matrix_world
            #writeMatrix(matrix)
            tabWrite("}\n")
            #continue #Don't render proxy mesh, skip to next object
            
################################XXX LOFT, ETC.
    def exportCurves(scene, ob):
        name_orig = "OB" + ob.name
        dataname_orig = "DATA" + ob.data.name

        name = string_strip_hyphen(bpy.path.clean_name(name_orig))
        dataname = string_strip_hyphen(bpy.path.clean_name(dataname_orig))

        global_matrix = mathutils.Matrix.Rotation(-pi / 2.0, 4, 'X')
        matrix=global_matrix*ob.matrix_world
        bezier_sweep = False
        if ob.pov.curveshape == 'sphere_sweep':
            for spl in ob.data.splines:
                if spl.type == "BEZIER":
                    bezier_sweep = True
        if ob.pov.curveshape in {'loft','birail'}:
            n=0
            for spline in ob.data.splines:
                n+=1
                tabWrite('#declare %s%s=spline {\n'%(dataname,n))
                tabWrite('cubic_spline\n')
                lp = len(spline.points)
                delta = 1/(lp)
                d=-delta
                point = spline.points[lp-1]
                x,y,z,w  = point.co[:]
                tabWrite('%.6f, <%.6f,%.6f,%.6f>\n'%(d,x,y,z))
                d+=delta
                for point in spline.points:
                    x,y,z,w  = point.co[:]
                    tabWrite('%.6f, <%.6f,%.6f,%.6f>\n'%(d,x,y,z))
                    d+=delta
                for i in range(2):
                    point = spline.points[i]
                    x,y,z,w  = point.co[:]
                    tabWrite('%.6f, <%.6f,%.6f,%.6f>\n'%(d,x,y,z))
                    d+=delta
                tabWrite('}\n')
            if ob.pov.curveshape in {'loft'}:
                n = len(ob.data.splines)
                tabWrite('#declare %s = array[%s]{\n'%(dataname,(n+3)))
                tabWrite('spline{%s%s},\n'%(dataname,n))
                for i in range(n):
                    tabWrite('spline{%s%s},\n'%(dataname,(i+1)))
                tabWrite('spline{%s1},\n'%(dataname))
                tabWrite('spline{%s2}\n'%(dataname))
                tabWrite('}\n')
            # Use some of the Meshmaker.inc macro, here inlined
            file.write('#macro CheckFileName(FileName)\n')
            file.write('   #local Len=strlen(FileName);\n')
            file.write('   #if(Len>0)\n')
            file.write('      #if(file_exists(FileName))\n')
            file.write('         #if(Len>=4)\n')
            file.write('            #local Ext=strlwr(substr(FileName,Len-3,4))\n')
            file.write('            #if (strcmp(Ext,".obj")=0 | strcmp(Ext,".pcm")=0 | strcmp(Ext,".arr")=0)\n')
            file.write('               #local Return=99;\n')
            file.write('            #else\n')
            file.write('               #local Return=0;\n')
            file.write('            #end\n')
            file.write('         #else\n')
            file.write('            #local Return=0;\n')
            file.write('         #end\n')
            file.write('      #else\n')
            file.write('         #if(Len>=4)\n')
            file.write('            #local Ext=strlwr(substr(FileName,Len-3,4))\n')
            file.write('            #if (strcmp(Ext,".obj")=0 | strcmp(Ext,".pcm")=0 | strcmp(Ext,".arr")=0)\n')
            file.write('               #if (strcmp(Ext,".obj")=0)\n')
            file.write('                  #local Return=2;\n')
            file.write('               #end\n')
            file.write('               #if (strcmp(Ext,".pcm")=0)\n')
            file.write('                  #local Return=3;\n')
            file.write('               #end\n')
            file.write('               #if (strcmp(Ext,".arr")=0)\n')
            file.write('                  #local Return=4;\n')
            file.write('               #end\n')
            file.write('            #else\n')
            file.write('               #local Return=1;\n')
            file.write('            #end\n')
            file.write('         #else\n')
            file.write('            #local Return=1;\n')
            file.write('         #end\n')
            file.write('      #end\n')
            file.write('   #else\n')
            file.write('      #local Return=1;\n')
            file.write('   #end\n')
            file.write('   (Return)\n')
            file.write('#end\n')

            file.write('#macro BuildSpline(Arr, SplType)\n')
            file.write('   #local Ds=dimension_size(Arr,1);\n')
            file.write('   #local Asc=asc(strupr(SplType));\n')
            file.write('   #if(Asc!=67 & Asc!=76 & Asc!=81) \n')
            file.write('      #local Asc=76;\n')
            file.write('      #debug "\nWrong spline type defined (C/c/L/l/N/n/Q/q), using default linear_spline\\n"\n')
            file.write('   #end\n')
            file.write('   spline {\n')
            file.write('      #switch (Asc)\n')
            file.write('         #case (67) //C  cubic_spline\n')
            file.write('            cubic_spline\n')
            file.write('         #break\n')
            file.write('         #case (76) //L  linear_spline\n')
            file.write('            linear_spline\n')
            file.write('         #break\n')
            file.write('         #case (78) //N  linear_spline\n')
            file.write('            natural_spline\n')
            file.write('         #break\n')
            file.write('         #case (81) //Q  Quadratic_spline\n')
            file.write('            quadratic_spline\n')
            file.write('         #break\n')
            file.write('      #end\n')
            file.write('      #local Add=1/((Ds-2)-1);\n')
            file.write('      #local J=0-Add;\n')
            file.write('      #local I=0;\n')
            file.write('      #while (I<Ds)\n')
            file.write('         J\n')
            file.write('         Arr[I]\n')
            file.write('         #local I=I+1;\n')
            file.write('         #local J=J+Add;\n')
            file.write('      #end\n')
            file.write('   }\n')
            file.write('#end\n')


            file.write('#macro BuildWriteMesh2(VecArr, NormArr, UVArr, U, V, FileName)\n')
            #suppressed some file checking from original macro because no more separate files
            file.write(' #local Write=0;\n')
            file.write(' #debug concat("\\n\\n Building mesh2: \\n   - vertex_vectors\\n")\n')
            file.write('  #local NumVertices=dimension_size(VecArr,1);\n')
            file.write('  #switch (Write)\n')
            file.write('     #case(1)\n')
            file.write('        #write(\n')
            file.write('           MeshFile,\n')
            file.write('           "  vertex_vectors {\\n",\n')
            file.write('           "    ", str(NumVertices,0,0),"\\n    "\n')
            file.write('        )\n')
            file.write('     #break\n')
            file.write('     #case(2)\n')
            file.write('        #write(\n')
            file.write('           MeshFile,\n')
            file.write('           "# Vertices: ",str(NumVertices,0,0),"\\n"\n')
            file.write('        )\n')
            file.write('     #break\n')
            file.write('     #case(3)\n')
            file.write('        #write(\n')
            file.write('           MeshFile,\n')
            file.write('           str(2*NumVertices,0,0),",\\n"\n')
            file.write('        )\n')
            file.write('     #break\n')
            file.write('     #case(4)\n')
            file.write('        #write(\n')
            file.write('           MeshFile,\n')
            file.write('           "#declare VertexVectors= array[",str(NumVertices,0,0),"] {\\n  "\n')
            file.write('        )\n')
            file.write('     #break\n')
            file.write('  #end\n')
            file.write('  mesh2 {\n')
            file.write('     vertex_vectors {\n')
            file.write('        NumVertices\n')
            file.write('        #local I=0;\n')
            file.write('        #while (I<NumVertices)\n')
            file.write('           VecArr[I]\n')
            file.write('           #switch(Write)\n')
            file.write('              #case(1)\n')
            file.write('                 #write(MeshFile, VecArr[I])\n')
            file.write('              #break\n')
            file.write('              #case(2)\n')
            file.write('                 #write(\n')
            file.write('                    MeshFile,\n')
            file.write('                    "v ", VecArr[I].x," ", VecArr[I].y," ", VecArr[I].z,"\\n"\n')
            file.write('                 )\n')
            file.write('              #break\n')
            file.write('              #case(3)\n')
            file.write('                 #write(\n')
            file.write('                    MeshFile,\n')
            file.write('                    VecArr[I].x,",", VecArr[I].y,",", VecArr[I].z,",\\n"\n')
            file.write('                 )\n')
            file.write('              #break\n')
            file.write('              #case(4)\n')
            file.write('                 #write(MeshFile, VecArr[I])\n')
            file.write('              #break\n')
            file.write('           #end\n')
            file.write('           #local I=I+1;\n')
            file.write('           #if(Write=1 | Write=4)\n')
            file.write('              #if(mod(I,3)=0)\n')
            file.write('                 #write(MeshFile,"\\n    ")\n')
            file.write('              #end\n')
            file.write('           #end \n')
            file.write('        #end\n')
            file.write('        #switch(Write)\n')
            file.write('           #case(1)\n')
            file.write('              #write(MeshFile,"\\n  }\\n")\n')
            file.write('           #break\n')
            file.write('           #case(2)\n')
            file.write('              #write(MeshFile,"\\n")\n')
            file.write('           #break\n')
            file.write('           #case(3)\n')
            file.write('              // do nothing\n')
            file.write('           #break\n')
            file.write('           #case(4) \n')
            file.write('              #write(MeshFile,"\\n}\\n")\n')
            file.write('           #break\n')
            file.write('        #end\n')
            file.write('     }\n')

            file.write('     #debug concat("   - normal_vectors\\n")    \n')
            file.write('     #local NumVertices=dimension_size(NormArr,1);\n')
            file.write('     #switch(Write)\n')
            file.write('        #case(1)\n')
            file.write('           #write(\n')
            file.write('              MeshFile,\n')
            file.write('              "  normal_vectors {\\n",\n')
            file.write('              "    ", str(NumVertices,0,0),"\\n    "\n')
            file.write('           )\n')
            file.write('        #break\n')
            file.write('        #case(2)\n')
            file.write('           #write(\n')
            file.write('              MeshFile,\n')
            file.write('              "# Normals: ",str(NumVertices,0,0),"\\n"\n')
            file.write('           )\n')
            file.write('        #break\n')
            file.write('        #case(3)\n')
            file.write('           // do nothing\n')
            file.write('        #break\n')
            file.write('        #case(4)\n')
            file.write('           #write(\n')
            file.write('              MeshFile,\n')
            file.write('              "#declare NormalVectors= array[",str(NumVertices,0,0),"] {\\n  "\n')
            file.write('           )\n')
            file.write('        #break\n')
            file.write('     #end\n')
            file.write('     normal_vectors {\n')
            file.write('        NumVertices\n')
            file.write('        #local I=0;\n')
            file.write('        #while (I<NumVertices)\n')
            file.write('           NormArr[I]\n')
            file.write('           #switch(Write)\n')
            file.write('              #case(1)\n')
            file.write('                 #write(MeshFile NormArr[I])\n')
            file.write('              #break\n')
            file.write('              #case(2)\n')
            file.write('                 #write(\n')
            file.write('                    MeshFile,\n')
            file.write('                    "vn ", NormArr[I].x," ", NormArr[I].y," ", NormArr[I].z,"\\n"\n')
            file.write('                 )\n')
            file.write('              #break\n')
            file.write('              #case(3)\n')
            file.write('                 #write(\n')
            file.write('                    MeshFile,\n')
            file.write('                    NormArr[I].x,",", NormArr[I].y,",", NormArr[I].z,",\\n"\n')
            file.write('                 )\n')
            file.write('              #break\n')
            file.write('              #case(4)\n')
            file.write('                 #write(MeshFile NormArr[I])\n')
            file.write('              #break\n')
            file.write('           #end\n')
            file.write('           #local I=I+1;\n')
            file.write('           #if(Write=1 | Write=4) \n')
            file.write('              #if(mod(I,3)=0)\n')
            file.write('                 #write(MeshFile,"\\n    ")\n')
            file.write('              #end\n')
            file.write('           #end\n')
            file.write('        #end\n')
            file.write('        #switch(Write)\n')
            file.write('           #case(1)\n')
            file.write('              #write(MeshFile,"\\n  }\\n")\n')
            file.write('           #break\n')
            file.write('           #case(2)\n')
            file.write('              #write(MeshFile,"\\n")\n')
            file.write('           #break\n')
            file.write('           #case(3)\n')
            file.write('              //do nothing\n')
            file.write('           #break\n')
            file.write('           #case(4)\n')
            file.write('              #write(MeshFile,"\\n}\\n")\n')
            file.write('           #break\n')
            file.write('        #end\n')
            file.write('     }\n')
     
            file.write('     #debug concat("   - uv_vectors\\n")   \n')
            file.write('     #local NumVertices=dimension_size(UVArr,1);\n')
            file.write('     #switch(Write)\n')
            file.write('        #case(1)\n')
            file.write('           #write(\n')
            file.write('              MeshFile, \n')
            file.write('              "  uv_vectors {\\n",\n')
            file.write('              "    ", str(NumVertices,0,0),"\\n    "\n')
            file.write('           )\n')
            file.write('         #break\n')
            file.write('         #case(2)\n')
            file.write('           #write(\n')
            file.write('              MeshFile,\n')
            file.write('              "# UV-vectors: ",str(NumVertices,0,0),"\\n"\n')
            file.write('           )\n')
            file.write('         #break\n')
            file.write('         #case(3)\n')
            file.write('           // do nothing, *.pcm does not support uv-vectors\n')
            file.write('         #break\n')
            file.write('         #case(4)\n')
            file.write('            #write(\n')
            file.write('               MeshFile,\n')
            file.write('               "#declare UVVectors= array[",str(NumVertices,0,0),"] {\\n  "\n')
            file.write('            )\n')
            file.write('         #break\n')
            file.write('     #end\n')
            file.write('     uv_vectors {\n')
            file.write('        NumVertices\n')
            file.write('        #local I=0;\n')
            file.write('        #while (I<NumVertices)\n')
            file.write('           UVArr[I]\n')
            file.write('           #switch(Write)\n')
            file.write('              #case(1)\n')
            file.write('                 #write(MeshFile UVArr[I])\n')
            file.write('              #break\n')
            file.write('              #case(2)\n')
            file.write('                 #write(\n')
            file.write('                    MeshFile,\n')
            file.write('                    "vt ", UVArr[I].u," ", UVArr[I].v,"\\n"\n')
            file.write('                 )\n')
            file.write('              #break\n')