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M3topoSetVertex
Takes a topology as a parameter.
Defines the integer position of vertex number '_index_' from the topology.
The topology automatically switches to 'dynamic' mode (as opposed to 'static').

I M3topoSetVertex (
S3d _session_
H3d _topo_
I _index_
[I I I] _position_
)
Parameters

_session_
3D Session
_topo_
Topology
_index_
Vertex index
_position_
New position
Return value

0 if successful, otherwise nil