pub fn parse_obj(
content: &str,
) -> Result<(Vec<[f32; 3]>, Vec<[f32; 3]>, Vec<u32>), String>Expand description
Parse a Wavefront OBJ string.
Returns (positions, normals, indices). Only v, vn, and f records
are processed. Face records must use the v//vn or v/vt/vn format;
bare v faces use vertex index as normal index.