Keep name of material even if using default material

[mberglundmx]

When the .mtl file is missing, the loader Warns and uses a default material. That is all good - however, it would be nice if the default material got the name that is specified in the usemtl line in the obj-file.

In my application I load obj files, and assign them materials based on a completely different physical representation, meaning the .mtl file does not make much sense. But I would still want to be able to read the material names, and map them to my specialized materials.

Currently I achieve this by creating dummy .mtl files, but it would be nice to not have to do that.

If there is an easier way already, please point me in the right direction, thanks!

[syoyo]

But I would still want to be able to read the material names, and map them to my specialized materials.

Current usemtl implementation try to map material name to material id, and name -> id mapping should be known in advance(through mtllib).

You may use callback API to assign custom material id based on material name in .obj

tinyobjloader/tiny_obj_loader.h

Line 2811 in e39c173

if (callback.usemtl_cb) {