how to determine if a mesh is closed

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  01 January 2009
how to determine if a mesh is closed

Simple question hopefully with a simple answer. How can I determine if a mesh is closed or not?
  01 January 2009
you could loop through the edges and see if any edge is only contained in one face... that face would be open

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  01 January 2009
Why not just use an STL modifier to check it?
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  01 January 2009
that could work but has the potential to be extremely slow, especially looping over multiple objects. I was hoping there was a built in function.

After writing the above and before posting I had a quick look at the edit_poly mod and came up with this function:
fn isClosedMesh o =
	addModifier o (edit_poly())
	m = o.modifiers[1]
	faces = #{1..(m.GetNumFaces())}
	m.SetSelection #Face faces
	isMeshClosed = (m.convertSelectionToBorder #Face #Edge) == 0
	deleteModifier o 1

It only seems to work with the modify panel open though which is a pain

Anyone know of a better way to do this?
  01 January 2009
-- For Editable Meshes and Polys:
(meshOp.getOpenEdges $).isEmpty
(polyOp.getOpenEdges $).isEmpty

-- true: the surface is closed
-- false: the surface is open


- Enrico
IllusionCatalyst Instrument set for 3ds Max │ AliquaForma Personal portfolio in fieri
  01 January 2009
Thanks Dave I'd completely forgotton about the STL modifier.

SyncViewS, your solution is nice and tidy. I don't think I've ever used getOpenEdges before. Thanks heaps
  01 January 2009
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