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i-obj: import wavefront object triangle meshes

this module reads an .obj file and provides it as triangle mesh ssbo to be passed on to further geometry node processing or a bvh module.

the texids.txt text file referred to by the texids parameter holds a list of object names as in the o objname lines in the .obj file, and their associated texture ids. the format is

objname_base:2
objname_emit:3
objname_norm:4
..

note that texture id zero is reserved for the codebook texture. normals are expected to live in tangent space with dpdu and dpdv rotated according to the texture coordinates.

connectors

• output an ssbo containing the triangle mesh. connect to geometry nodes or a bvh builder module.

parameters

• filename the input obj filename
• startid the id to use for the first frame in case the filenames are animated
• texids the filename of a text file associating obj object names and texture ids