Added material merger pseudo loader.
Merge pull request #1 from zqsd/master

Material merger
OBJ export triangles and quads.

Rather than triangle_fan for both cases.
Wireframe triangle_fan each triangle.
Merge pull request #2 from zqsd/master

Wireframe fixes for Sketchfab
Minecraft to osg exporter.

Convert an obj minecraft map :
- Puts a directional light as sun
- Set textures in NEAREST filtering mode
Double side for some minecraft materials.
Ambient texture export.
Merge pull request #3 from zqsd/master

Minecraft export
Add rotation to the light
UserData and normal regen.
Normal regenerated using osgUtil::SmoothingVisitor
Removed minecraft sun light.
Removed unnecessary includes and declarations.
merge
Merge branch 'master' into develop
Add vertex color support to obj