Forums Houdini Indie and Apprentice how to fix non-manifold edges?

how to fix non-manifold edges?

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olivierth
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Hi!

I'm making a rock generator that does many booleans in a for-each loop. I'm using a Clean sop with the “manifold only topology” option in the loop right before the boolean yet I always get an error about “non-manifold edges” at around the 8th iteration. The next iterations after the error causes huge holes in the mesh.

What would be the right way to fix non-manifold edges?

-Olivier

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non_manifold_edges.JPG (161.7 KB)

-Olivier
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Andr
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very hard to tell without inspecting the geo.
maybe you could upload A and B geo before boolean.

Anyway what kind of operation is doing the right input boolean with both inputs from the same copy node?
Have you tried to append a clean or a fuse node after that boolean?
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olivierth
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The whole problem seems to come from a hole the mesh. I do an “extrude” from that 2D shape and it creates non-manifold edges. Any way to solve these things? I tried clean and polydoctor. Nothing works.

-Olivier

Attachments:
non_manifold_edges_b.JPG (38.2 KB)

-Olivier
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olivierth
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I was able to fix that problem by using a polyfill and blasting any primitive with more than 4 points after that.

Now I'm getting another problem. A non-manifold edge happens at an infinitely thin section of the mesh. Every single time I get a different problem. I'm about to go nuts.

-Olivier

Attachments:
non_manifold_edges_c.JPG (30.4 KB)

-Olivier
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olivierth
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…alright, so I did not find a way to fix non-manifold edges but I changed some things that avoids getting those bad edges.

At each loop, I checked to make sure I only had one geo (connectivity) and no floating pieces. I've also removed the fuse and clean sop since they caused more problems then solved them.

Now, it looks good (for now).

-Olivier
-Olivier
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artsomniadotart
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on my side “clean” node works due to non-manifold edges.
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