@pmndrs/bvh
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    Interface BvhThreeMaterialInfo

    What BvhSceneFromObject3DOptions.material is told about the instance it names a material for.

    interface BvhThreeMaterialInfo {
        group: number;
        instanceId: number;
        materialIndex: number;
        threeMaterial: Material<MaterialEventMap> | null;
    }
    Index
    group: number

    The geometry group, or -1 when the mesh has one material (draw range only).

    instanceId: number

    The instance of an InstancedMesh or BatchedMesh, or -1 for a plain mesh.

    materialIndex: number

    The group's materialIndex into the mesh's array of materials, or -1.

    threeMaterial: Material<MaterialEventMap> | null

    The three material that draws these triangles (the group's, or the mesh's).