ReadonlyboundsObject-space box [min x3, max x3]: the union of the cluster root's child boxes as the nodes store them (a leaf's own box).
ReadonlydepthLevels of nodes in the cluster's tree (a leaf cluster's one-node tree counts 1).
ReadonlyfirstThe cluster's lowest triangle slot, relative to the mesh's triangles.
ReadonlynodeThe cluster's root node, relative to the mesh's root (0: the whole
tree), or -1 for a leaf cluster, which is child side of node parent.
ReadonlyparentReadonlysideReadonlytriangleTriangles under the cluster.
One cluster of a mesh's tree (from meshClusters).