Generate VRML2 materials instead of color indices in "Material color" mode
if possible, i.e. if the object has only one material slot. For multi-material objects, the old
behaviour is used as fallback.
The following material properties are supported:
- Diffuse color
- Specular color
- Emissive color
- Ambient intensity
- Transparency / Alpha
- Specular hardness / Shininess