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Wavefront OBJ, with colours and diffuse textures from its MTL library.
A material’s map_Kd picture is looked up next to its MTL file, then
next to the model (never outside the model’s folder); its -o and -s
options are baked into the texture coordinates (-clamp is ignored,
textures always repeat). The picture replaces the Kd colour where it is drawn, as in
Eagle’s viewer.
map_bump (or bump) is read the same way into the surface’s bump map;
its -bm strength is ignored, as Eagle’s viewer ignores it. The
coordinates take their -o and -s from map_Kd, else from the bump
map. A material whose d or Tr is not 1 draws see-through. map_Ke,
Ke, norm and map_d are not read, as in Eagle’s viewer. Statement
names are compared without regard to case.