what parameter that caused the lightness diff of same obj files as shown in screenshots

```
What steps will reproduce the problem?
1. they are obj+mtl exported from different 3d tool of different versions
2. one is exported obj+mtl by 3dmax 2014
3. another is exported obj+mtl by 3dmax 2011

What is the expected output? What do you see instead?
the render effect has huge difference.
(can be see the great contrast of lightness in attachment files)

Please provide any additional information below.

1.wish giving some advice on what parameters and in which file (obj or mtl)
that caused such lightness difference on one same 3d obj.

2. obj compatibility issue is discovered that obj+mtl exported by the 3dmax2014
seems can not load:
a.color material parameters such as (changing Kd value in mtl color didn't change)
b.texture files such as ( while map_Kd is disabled or enalbed, doesn't show diff )

( is there any methods to detect whether obj exported is corrupted for jsc3d to
load properly? it is caused by the corruption of which parameters in export
setting of 3dmax)

thank you so much

```

Original issue reported on code.google.com by `haibo...@solstice.sg` on 16 Aug 2014 at 1:11

Attachments:
- [3dmax2011.png](https://storage.googleapis.com/google-code-attachments/jsc3d/issue-102/comment-0/3dmax2011.png)
- [3dmax2014.png](https://storage.googleapis.com/google-code-attachments/jsc3d/issue-102/comment-0/3dmax2014.png)

Compare the attached 3dmax2011.png and 3dmax2014.png screenshots with the corresponding OBJ and MTL exports. Start by examining how JSC3D loads OBJ materials, colors, and map_Kd textures; done means identifying the export parameter or compatibility difference responsible for the rendering and load behavior.

Written by the indexing model from the issue text.