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[Hason]

I know,that for working hull i need set unique smoothing group(for that i press button "Process CM"),but it don`t working.
I get error: "WARNING: Model has 2-dimensional geometry (less than 0.500 inches thick on any axis)!!!
WARNING: Model has 2-dimensional geometry (less than 0.500 inches thick on any axis)!!!
WARNING: Model has 2-dimensional geometry (less than 0.500 inches thick on any axis)!!!
WARNING: Error with convex elements of mesh_0057_hull.smd, building single convex!!!!". I have video on youtube with all my steps,but i don`t know can i post links to videos on this forum.
( Sorry for my english)

[wallworm]

This generally means that you have planar elements.

The easiest way to fix something like this is along these lines:

• Weld all verts of the Hull
• In Element Sub-Object mode: Click CTR+A to select ALL
• In Element Sub-Object Mode: Alt-Click each element to keep (deselecting it) DO NOT DRAW SELECTION--just CLICK.
• When done, take note of how many polys are selected in Modify tab. Click Delete to remove these unwanted flat polys.