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Add support for negative vertex indices in OBJ loader for 2.x - #8512
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Switched OBJ face parsing to use
.at()for array access instead of bracket notation. Negative indices (like -1 for last vertex) now work per OBJ spec, positive indices still get converted from 1-based to 0-based.Resolves #8493
Changes
src/webgl/loading.js.at()forloadedVerts.v,loadedVerts.vt,loadedVerts.vnlookups to handle both negative and positive indexingtest/unit/assets/cube-negative-indices.obj,, test file with negative face indicesPR Checklist