Function liveMaterialCount

How many materials have been constructed and not yet disposed (§83).

Every family member (UnlitMaterial, LitMaterial, SpriteMaterial, StandardMaterial, NodeMaterial, and any subclass of Material) counts as one: they all go through the base constructor and Material.dispose.

const before = liveMaterialCount();
const material = new UnlitMaterial();
liveMaterialCount() - before; // 1
material.dispose();
liveMaterialCount(); // === before
Copy

Reading it allocates nothing and costs one property read. A material that is collected without dispose() is never subtracted — that is the leak signal, not an oversight.