If you run the following it will make a grid and a torus that sort of
"pushes" the grid around.
//begin
CreatePrim("Grid", "MeshSurface", null, null);
SetValue("grid.polymsh.geom.subdivu", 21, null);
SetValue("grid.polymsh.geom.subdivv", 24, null);
CreatePrim("Torus", "MeshSurface", null, null);
ActivateObjectSelTool(null);
SelectObj("grid", null, true);
ActivateObjectSelTool(null);
ApplyOp("ShrinkWrap", "grid;torus;", 3, siPersistentOperation, null, 0);
SetValue("grid.polymsh.shrinkwrap.proj", 3, null);
//end
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