[Bf-extensions-cvs] [bd9fa80] master: Fix T43487: Wavefront OBJ exporter should export more precise illum value in MTL file.

[Bastien Montagne]

Commit: bd9fa8054318f513500bc93316b64421b0f0d3fc
Author: Bastien Montagne
Date:   Fri Apr 24 16:06:33 2015 +0200
Branches: master
https://developer.blender.org/rBAbd9fa8054318f513500bc93316b64421b0f0d3fc

Fix T43487: Wavefront OBJ exporter should export more precise illum value in MTL file.

Was a TODO actually, now we try to match better illum values with current mesh material.
Also, using mirror color as Ka instead of ambient one, when mirror is enabled in blen mat.

===================================================================

M	io_scene_obj/__init__.py
M	io_scene_obj/export_obj.py

===================================================================

diff --git a/io_scene_obj/__init__.py b/io_scene_obj/__init__.py
index 1d778e3..17ef0f4 100644
--- a/io_scene_obj/__init__.py
+++ b/io_scene_obj/__init__.py
@@ -21,7 +21,7 @@
 bl_info = {
     "name": "Wavefront OBJ format",
     "author": "Campbell Barton, Bastien Montagne",
-    "version": (2, 1, 0),
+    "version": (2, 1, 1),
     "blender": (2, 74, 0),
     "location": "File > Import-Export",
     "description": "Import-Export OBJ, Import OBJ mesh, UV's, "
diff --git a/io_scene_obj/export_obj.py b/io_scene_obj/export_obj.py
index 2241056..e7d646b 100644
--- a/io_scene_obj/export_obj.py
+++ b/io_scene_obj/export_obj.py
@@ -73,6 +73,8 @@ def write_mtl(scene, filepath, path_mode, copy_set, mtl_dict):
         fw('\nnewmtl %s\n' % mtl_mat_name)  # Define a new material: matname_imgname
 
         if mat:
+            use_mirror = mat.raytrace_mirror.use and mat.raytrace_mirror.reflect_factor != 0.0
+
             # convert from blenders spec to 0 - 1000 range.
             if mat.specular_shader == 'WARDISO':
                 tspec = (0.4 - mat.specular_slope) / 0.0004
@@ -81,7 +83,10 @@ def write_mtl(scene, filepath, path_mode, copy_set, mtl_dict):
             fw('Ns %.6f\n' % tspec)
             del tspec
 
-            fw('Ka %.6f %.6f %.6f\n' % (mat.ambient * world_amb)[:])  # Ambient, uses mirror color,
+            if use_mirror:
+                fw('Ka %.6f %.6f %.6f\n' % (mat.raytrace_mirror.reflect_factor * mat.mirror_color)[:])
+            else:
+                fw('Ka %.6f %.6f %.6f\n' % (mat.ambient * world_amb)[:])  # Ambient, uses mirror color,
             fw('Kd %.6f %.6f %.6f\n' % (mat.diffuse_intensity * mat.diffuse_color)[:])  # Diffuse
             fw('Ks %.6f %.6f %.6f\n' % (mat.specular_intensity * mat.specular_color)[:])  # Specular
             if hasattr(mat, "raytrace_transparency") and hasattr(mat.raytrace_transparency, "ior"):
@@ -90,11 +95,24 @@ def write_mtl(scene, filepath, path_mode, copy_set, mtl_dict):
                 fw('Ni %.6f\n' % 1.0)
             fw('d %.6f\n' % mat.alpha)  # Alpha (obj uses 'd' for dissolve)
 
-            # 0 to disable lighting, 1 for ambient & diffuse only (specular color set to black), 2 for full lighting.
+            # See http://en.wikipedia.org/wiki/Wavefront_.obj_file for whole list of values...
+            # Note that mapping is rather fuzzy sometimes, trying to do our best here.
             if mat.use_shadeless:
                 fw('illum 0\n')  # ignore lighting
             elif mat.specular_intensity == 0:
                 fw('illum 1\n')  # no specular.
+            elif use_mirror:
+                if mat.use_transparency and mat.transparency_method == 'RAYTRACE':
+                    if mat.raytrace_mirror.fresnel != 0.0:
+                        fw('illum 7\n')  # Reflection, Transparency, Ray trace and Fresnel
+                    else:
+                        fw('illum 6\n')  # Reflection, Transparency, Ray trace
+                elif mat.raytrace_mirror.fresnel != 0.0:
+                    fw('illum 5\n')  # Reflection, Ray trace and Fresnel
+                else:
+                    fw('illum 3\n')  # Reflection and Ray trace
+            elif mat.use_transparency and mat.transparency_method == 'RAYTRACE':
+                fw('illum 9\n')  # 'Glass' transparency and no Ray trace reflection... fuzzy matching, but...
             else:
                 fw('illum 2\n')  # light normaly