what's nonmanifold?

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# 1 16-07-2006 , 10:19 AM

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Join Date: Apr 2006

Posts: 157

what is it and what's the use of knowing it? does it affect my modeling or texturing or whatever? if so how?

really sorry... i just dont get my book lol...

any way thx for replying

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# 2 16-07-2006 , 09:29 PM

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Join Date: Jul 2006

Location: Los Angeles

Posts: 38

Non manifold geometry is when the polygons don't form a continuous surface. - and thus can't be unfolded into a continuous piece. This is relavent when UV mapping and performing certain operations that don't work on non-manifold geometry (for example, boolean operations). Also, some real time engines and other modeling packages don't support non manifold geometry.

Usualy non-manifold means:

*three or more faces share an edge (like when you extrude an edge of a cube)

*Two or more faces share a single vertex but no edge ( like when you merge the corner vertexe's of two planes together)

*adjacent faces have opposite normals (like when you flip the normal of a side of a cube)

Attached is an image to help explain.

Hope this helps!

Attached Thumbnails