[MATERIAL] Question about Material creation

Hi there,

I have strange segfault when I change Materials name, in particularly, if I change InstantBaseShadowed name to any, it don't work.

So, for texture Light, the material name must be ImagePagingLight or InstantBaseShadowed, beceause I think, in source code, there are tests about material name, and active in consequence, adapted functionality of material.
Where can I find a description of the process? Or anyone can explain?

Thanks