closing a model!

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Old 03 March 2009   #1
closing a model!

Hi guys..

is there a quick way to find out where a model is open.. when i say open i mean not closed in the sense that there might me a polygon missing or a vertex that isn't merged or weilded... is there a quick way to find out this?
 
Old 03 March 2009   #2
but in what way?
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Old 03 March 2009   #3
In the viewport under the eye tab make sure polymesh boundries and hard edges are set to visible - that will show any edges/holes in the mesh in blue - I assume this is what you're after?
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Old 03 March 2009   #4
Select the object, set the selection filter to Boundary Edges and then Ctrl+A. If any edges are selected, then the mesh is non-manifold.
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Old 03 March 2009   #5
for future reference: a model with no boundary edges is called "watertight"
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Old 03 March 2009   #6
Haha... hadn't heard it referred to as that. A manifold mesh is the term I have seen referred to most frequently... but that may simply from my Wings3D modelling roots.
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Old 03 March 2009   #7
Originally Posted by JDex: Haha... hadn't heard it referred to as that. A manifold mesh is the term I have seen referred to most frequently... but that may simply from my Wings3D modelling roots.

Manifold and watertight are not synonimous.
Watertight is what the name suggests, it means that if the hull was to hypothetically be submerged its contents wouldn't change.
Manifold relates to neighborhood and continuity, and can be of different types.

For a meshed geometry to be manifold not all points need to be connected (hence you can have a hole), for something to be watertight not all points need to have an euclidan homeomorphic neighborhood.
A mesh can be non watertight and still be manifold, or be watertight and still be non manifold.
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Last edited by ThE_JacO : 03 March 2009 at 02:50 AM.
 
Old 03 March 2009   #8
in others word a watertight mesh will not sink in the bucket filled with water
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Old 03 March 2009   #9
Originally Posted by Saturn: in others word a watertight mesh will not sink in the bucket filled with water

An empty egg with the hole side up put in water isn't watertight, but won't sink
Content uneffected remains the definition I'm afraid... unless you have a clip map applied to the hull, that alwasy makes it messy.
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Last edited by ThE_JacO : 03 March 2009 at 11:35 AM.
 
Old 03 March 2009   #10
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