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How to turn a finely tesselated flat area into a couple of faces [message #59832] Tue, 08 January 2013 14:22 UTC Go to previous message
avatar bib993  is currently offline bib993
Messages: 37
Registered: November 2012
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Hi Shapers!

This is a screenshot of a simplified fractal model I'm working on.

http://fc01.deviantart.net/fs71/f/2013/008/a/8/capture_by_bib993-d5qu5s0.jpg

For information, I get this mesh by applying marching cubes on a set of voxel slices (in a program called Fiji). As you notice, due to the marching cubes process, it generates a detailed grid and this consumes a lot of faces, so I'm hitting the 1 million limit (actually I have more than 5 millions faces in my mesh).

I am confident that this can be reduced a lot by simplyfing all these large flat beams into a couple of faces, because the small faces are well aligned (or at least they look so).

I have tried various options in Meshlab. So far I got the best results using the Quadric Edge Collapse Decimation, but due to the strong decimation factor, I get some inconsistencies and a mesh full of problems that Netfabb cannot fix automatically, and also it affects edges and detailed areas that I'd like to keep intact.

http://fc06.deviantart.net/fs70/f/2013/008/1/8/capture2_by_bib993-d5qu6hf.jpg

I also thought that the tri-to-quad filters could help to merge 2 adjacent triangles into a square, thus reducing by about 50% de number of faces, but it seems that doesn't work this way.

And I also can't prepare the mesh with some smoothing before decimation because that would soften the right angles all over the place.

Any advice on the best decimation strategy in this case? Testing all the options combinations in the Quadric Edge Collapse Decimation dialog takes a lot of time and trial and error, so I wonder if anyone has gone through this already? In particular, I am not sure if I should use the "Planar simplication" option or not.

Thanks!

Regards

bib

[Updated on: Tue, 08 January 2013 14:48 UTC]


Jérémie

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