What meshlet_triangles refers to ?

[GiuseppeCassisi96]

Hey,
what does the meshlet_triangles array set by meshopt_buildMeshlets() refer to? Does it correspond to specific triangles or to indices in the meshlet_vertices array?

Many thanks

[zeux]

See

meshoptimizer/src/meshoptimizer.h

Lines 473 to 479 in 6280fd6

	/**
	* Meshlet is a small mesh cluster (subset) that consists of:
	* - triangles, an 8-bit micro triangle (index) buffer, that for each triangle specifies three local vertices to use;
	* - vertices, a 32-bit vertex indirection buffer, that for each local vertex specifies which mesh vertex to fetch vertex attributes from.
	*
	* For efficiency, meshlet triangles and vertices are packed into two large arrays; this structure contains offsets and counts to access the data.
	*/

[GiuseppeCassisi96]

So, the triangles array contains indices that refers to vertices locally while the vertices contain indices that refers to vertices globally. Is it right?