MapPropIds (in MeshPainter.Backend.cs) referenced the *Id fields from the
MeshPainter.cs partial in its field initializer. Static field-initializer
order across partial-class files is unspecified in C#; after the script
reorg the composite array initialized before the *Id fields and captured 0
for every property id. HasProperty(0) is always false, so AssignMapTexture
bound no maps at all -> the shader fell back to its white default textures,
making every fresh avatar fully glossy (smoothness 1) and emissive.
Build MapPropIds lazily on first access (runtime, after all static
initializers) so the file order no longer matters. The per-stroke allocation
savings are preserved; only a single null-check per call is added.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
adminandClaude Opus 4.8
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