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M3topoAddVertex
Takes a topology as a parameter.
Adds a new vertex to the list of vertices for the topology referenced by the mesh.
The position coordinates are integer values. The function returns the vertex’s index.

I M3topoAddVertex (
S3d _session_
H3d _topo_
[I I I] _position_
)
Parameters

_session_
3D Session
_topo_
Topology
_position_
Position of new vertex
Return value

Index of the new vertex