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warp.mesh_get_index#

warp.mesh_get_index(id: uint64, index: int32) → int#

  • Kernel

Look up the vertex index stored at a face-vertex position in the warp.Mesh’s index buffer.

index is a face-vertex index in [0, 3 * number_of_faces); returns the vertex index it stores (indices[index]), which in turn indexes the mesh’s points array.

Parameters:

  • id – The mesh identifier

  • index – A face-vertex index, in [0, 3 * number_of_faces)

Returns:

The vertex index stored at that position, or -1 if the mesh has no index buffer.

Example

@wp.kernel
def face0_verts(mesh_id: wp.uint64, out: wp.array[wp.int32]):
    out[0] = wp.mesh_get_index(mesh_id, 0)
    out[1] = wp.mesh_get_index(mesh_id, 1)
    out[2] = wp.mesh_get_index(mesh_id, 2)

points = wp.array([[0,0,0],[1,0,0],[1,1,0],[0,1,0],[0,0,1],[1,0,1],[1,1,1],[0,1,1]], dtype=wp.vec3)
indices = wp.array([0,3,2, 0,2,1,  4,5,6, 4,6,7,  0,1,5, 0,5,4,
                    2,3,7, 2,7,6,  0,4,7, 0,7,3,  1,2,6, 1,6,5], dtype=wp.int32)
mesh = wp.Mesh(points=points, indices=indices)

out = wp.zeros(3, dtype=wp.int32)
wp.launch(face0_verts, dim=1, inputs=[mesh.id], outputs=[out])
print(out.numpy())

[0 3 2]