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Author Topic: Mesh Decimation Degenerate Faces  (Read 180 times)

SamT

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Mesh Decimation Degenerate Faces
« on: September 25, 2019, 05:57:07 AM »
Hey There!

I've noticed that whenever I use the mesh decimation feature I end up with crossing edges / degenerate faces in the resultant mesh.
They are not picked up by the fix topology tool.
Happens with both height field and arbitrary meshes.
Would be great to have this fixed in a future release.

Mak11

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Re: Mesh Decimation Degenerate Faces
« Reply #1 on: September 25, 2019, 12:08:06 PM »
This can't really be easily "fixed" unfortunately. Decimation is never perfect and there isn't a single solution out on the market (Zbrush Zremesher/Decimation master, 3DCoat, Instant mesh, InstaLOD etc..) that produces great result without the original mesh being manually cleaned up before hand.

Mak

SamT

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Re: Mesh Decimation Degenerate Faces
« Reply #2 on: September 26, 2019, 12:35:19 AM »
I'm using Maptek PointStudio "Fix Surface" tool at the moment which does an excellent job of removing the crossing triangles.

Alexey Pasumansky

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Re: Mesh Decimation Degenerate Faces
« Reply #3 on: September 26, 2019, 03:40:20 PM »
Hello SamT,

Can you share the source model (or a part of the model) and the decimation result with support@agisoft.com, so that we could check, whether the decimation in Metashape can be improved?
Best regards,
Alexey Pasumansky,
AgiSoft LLC

SamT

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Re: Mesh Decimation Degenerate Faces
« Reply #4 on: September 27, 2019, 01:22:41 AM »
Original mesh, decimated mesh, repaired decimated mesh and a dxf of intersections sent.

Let me know if you need any more.

Thanks Alexey!
« Last Edit: September 27, 2019, 01:25:07 AM by SamT »