GSOC 26: multi-material .mtl loading test coverage

[Nixxx19]

what

rounds out the test coverage for multi-material .mtl loading (phase 6), on top of the parser/data layer from #8879 and the renderer from #8955. covers the happy path, the error modes, and the edges the proposal called out.

unit tests

parser (parseMtl.js):

• a Kd-only material parses without error
• a malformed mtl (unknown token, missing value, blank line) does not throw

loader (loadModel.js):

• a single-material obj stays one part (no split, zero regression)
• a 12-material obj splits into 12 parts, every face accounted for
• parts get computed normals when the obj has no vn lines
• each part carries its own localised uvs
• a failed texture load warns instead of failing silently, and the model still loads

visual regression tests (webgl.js)

• a multi-material obj renders each material part (textured.obj)
• a slice with a missing texture falls back to its colour instead of crashing (missing_texture.obj)
• a 12-material obj renders every material (multi_material_12.obj)
• a single-material obj renders through the part path (single_material.obj)

each visual test commits a stable reference screenshot.

fixtures added

missing_texture (404 map_Kd), multi_material_12 (12 materials), single_material (one material).

testing

• loadModel + parseMtl unit suites green
• all four visual tests generate stable references and match on re-run

part of the gsoc multi-material .mtl work, follows #8879 and #8955.

[p5-bot]

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