Function enableMaterialStencil

Enable per-material stencil state for Standard, PBR, and Shader materials.

A writer material uses compare: "always" + passOp: "increment-clamp" to stamp the stencil buffer where it draws; a tester material uses compare: "equal" to draw only where the stencil is still the pass's default reference of 0 (i.e. where the writer did NOT draw). No dynamic stencil reference is needed.

const mask = createStandardMaterial();
mask.stencil = { passOp: "increment-clamp" }; // writes 1 where it draws
const masked = createStandardMaterial();
masked.stencil = { compare: "equal" };        // draws only where stencil is still 0

enableMaterialStencil(); // ← opt-in, before registerScene
await registerScene(scene);
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