Realtime editing of a trimesh from an object3D

[Martin Dillon <martin dot dillon at optusnet dot com dot au>]

I'm trying to move individual vertices within a trimesh that has been 
extracted from an object3D using the new RB2005r3 features. I can 
extract the trimesh ok, and change the position of individual vertices, 
but I can't re-assign my changes back to the object3D to show the new 
shape in RB3Dspace.
 dim tm as trimesh
 dim Object1 as Object3D

 // load and display a pre-existing model
 Object1 = New Object3D
 f = GetFolderItem("TwoBoxes.3DMF")
 Object1.AddShapeFromFile(f)
 Object1.scale = 0.2
 Object1.RenderBackFaces = True
 RB3Dspace1.objects.Append Object1

 //get the first trimesh in the model
 tm = new trimesh
 tm = Object1.Trimesh(0)

  //get the xyz coordinates of the first vertex in the trimesh
  x1 = tm.VertexPositions.X(0)
  y1 = tm.VertexPositions.Y(0)
  z1 = tm.VertexPositions.Z(0)

  //change the xyz position of the first vertex to warp the model
  tm.VertexPositions.SetXYZ(0, x1 + 10 , y1+10, z1 +10)

   // Re-assign the trimesh back to the Object3D so that it's new shape 
is displayed
   Object1.Trimesh(0) = tm  // <-- This assignment is illegal and won't 
compile.
  
Everything works until the last line. What is the correct way to achieve 
this?
Thanks,
Martin
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