Fix the problem of loading obj file with vertex color #300
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Some .obj files may contain vertex colors in "v" field, in this case, each "v" line contain `x y z` and `r g b`. The old way will load the colors as coordinates which is wrong.
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Some .obj files may contain vertex colors in "v" field.
https://en.wikipedia.org/wiki/Wavefront_.obj_file#Geometric_vertex
In this case, each "v" line contains
x y zandr g b. The old way will load the colors as coordinates which is wrong.