volumepostoindex expression function

Converts world space coordinates to volume voxel coordinates.

See also: volumeindextopos, volumesample

This function will return the voxel closest to the given worldspace coordinated. The axis selects which coordinate is returned.

surface_node is the full path of the surface node. The prim_id is the primitive number of the volume primitive within the surface node.

Returns 0 if out of bound values are specified, or the given primitive is not a volume.

axis controls which component of the world space position is returned:

• axis = 0: X-axis

• axis = 1: Y-axis

• axis = 2: Z-axis

volumepostoindex("/obj/geo1/isooffset1", 0, 3, 4, 5, 0)