Remove overlapping primitives

Forums Houdini Indie and Apprentice Remove overlapping primitives

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stinzen: Member; 42 posts; Joined: March 2014; Offline

March 9, 2021 9:45 a.m.

Any ideas on how to remove overlapping primitives like this? Tried Clean SOP, PolyDoctor and Boolean Union without luck.

Edited by stinzen - March 9, 2021 09:45:23

Attachments:
overlap.JPG (94.9 KB)


Konstantin Magnus: Member; 721 posts; Joined: Sept. 2013; Offline

March 9, 2021 12:23 p.m.

Hole SOP

https://procegen.konstantinmagnus.de/ [procegen.konstantinmagnus.de]


stinzen: Member; 42 posts; Joined: March 2014; Offline

March 11, 2021 8:08 a.m.

Konstantin Magnus
Hole SOP

Thank you but I don't want to cut holes in the mesh I just want to remove the small ones.


Konstantin Magnus: Member; 721 posts; Joined: Sept. 2013; Offline

March 11, 2021 3:50 p.m.

I see, how about this:

triangulate2d: silhouette: *, remove outside of silhouette
divide: remove shared edges

https://procegen.konstantinmagnus.de/ [procegen.konstantinmagnus.de]


albinioni: Member; 71 posts; Joined: Sept. 2018; Offline

March 12, 2021 6:04 a.m.

Delete Small Parts from SideFX Labs?


stinzen: Member; 42 posts; Joined: March 2014; Offline

March 12, 2021 7:29 a.m.

Konstantin Magnus
I see, how about this:

triangulate2d: silhouette: *, remove outside of silhouette
divide: remove shared edges

That worked a little bit to well, I'm working with building shapes and with that method they were all merged together.

Edited by stinzen - March 12, 2021 07:31:56

Attachments:
before.JPG (64.6 KB)
after.JPG (47.4 KB)


stinzen: Member; 42 posts; Joined: March 2014; Offline

March 12, 2021 7:33 a.m.

albinioni
Delete Small Parts from SideFX Labs?

Problem is that I have other parts that are even smaller.

Edited by stinzen - March 12, 2021 07:33:41

Attachments:
small.JPG (92.7 KB)


albinioni: Member; 71 posts; Joined: Sept. 2018; Offline

March 12, 2021 9:22 a.m.

If you don't mind hard coding the deletion, you can create a blast node and blast away the primitives that are causing you the problem.

Attachments:
remove primitive.hiplc (68.9 KB)


stinzen: Member; 42 posts; Joined: March 2014; Offline

March 12, 2021 9:29 a.m.

It has to be procedural because I'm loading in different maps, I'm gonna try using rays, detect hitPrims and remove the smaller one.


Aizatulin: Member; 504 posts; Joined: July 2005; Offline

March 12, 2021 5:03 p.m.

Hi,

here are two heuristic (similar) methods using the hole sop.

Attachments:
remove_overlap_prim.hipnc (118.4 KB)


Konstantin Magnus: Member; 721 posts; Joined: Sept. 2013; Offline

March 12, 2021 5:33 p.m.

Filtering by distance is probably faster. And sharing your actual geometry is, too.

Attachments:
remove_inside.hipnc (127.7 KB)

https://procegen.konstantinmagnus.de/ [procegen.konstantinmagnus.de]


Aizatulin: Member; 504 posts; Joined: July 2005; Offline

March 13, 2021 3:04 a.m.

I thought that too, but xyzdist() by group is incredible slow compared to the non grouped version (don't ask me why). Looks like it is very expensive to filter the geometry every time.

Edited by Aizatulin - March 13, 2021 03:09:29

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