3D volume mesh

 
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lopkiol



Joined: 26 Jan 2007
Posts: 20
Location: United Kingdom

PostPosted: Tue Feb 06, 2007 2:48 pm    Post subject: 3D volume mesh Reply with quote

Hello everybody! Very Happy

What do you think about a new feature that calculates a 3D volume mesh for your surfaces?

ciao
Ruggero
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nextstep
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Joined: 06 Jan 2007
Posts: 538

PostPosted: Wed Feb 07, 2007 1:03 am    Post subject: Reply with quote

lopkiol wrote:

What do you think about a new feature that calculates a 3D volume mesh for your surfaces?

The big problem with volumetric objects is that they aren't easy to visualise: Unlike surfaces, the visualisation process should take care of huge amount of data and there is not a single way to do it...
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Abderrahman
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lopkiol



Joined: 26 Jan 2007
Posts: 20
Location: United Kingdom

PostPosted: Wed Feb 07, 2007 10:53 am    Post subject: Reply with quote

I know. But what about an export feature, with no visualization of the 3D volume mesh, but only the calculation, for use with an external finite element analysis solver?
Yes, it is not that easy, obviously. I was thinking of a tetrahedral mesh. The idea of generating offset surfaces inside the part is brilliant.
Did you think it is better work with the points and triangles of the mesh of the surface or with the analytical function? To get the offset surface, I mean.
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nextstep
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PostPosted: Thu Feb 08, 2007 5:07 am    Post subject: Reply with quote

lopkiol wrote:
I was thinking of a tetrahedral mesh. The idea of generating offset surfaces inside the part is brilliant.

I don't think I've understand what you mean with "generating offset surfaces inside the part". Is there a document that describe this technic?
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Abderrahman
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lopkiol



Joined: 26 Jan 2007
Posts: 20
Location: United Kingdom

PostPosted: Fri Feb 09, 2007 12:09 pm    Post subject: Reply with quote

There probably is. But I don't care, I like to do on my own. Very Happy
An offset surface is a surface the points of which dist a constant value from his parent-surface. It can be done inward or outward.
We have the surface in the analytical form F(x,y,z)=0, don't we? Then we can get the points and triangulate them (and you've already done it). Then we can get extra points inside the surface, at a fixed distance, say the characteristic length. This length will be similar to the distance between to adjacent points on the surface. All these point will then be joined with a triangulation. Then with the outer shell. An inner shell will be built in the same manner.
The other approach was to find an analytical offset function and the get the points on it. The rest will be the same of the first approach.

A totally different approach is to randomly (but not completely randomly) spread points inside the volume enclosed by the surface. Then have a Delaunay triangulation http://en.wikipedia.org/wiki/Delaunay_triangulation.

ciao
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