Delete faces not visible to direction.

Forums Houdini Indie and Apprentice Delete faces not visible to direction.

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joostjordens: Member; 8 posts; Joined: Jan. 2017; Offline

Oct. 31, 2018 9:26 a.m.

Hey guys,

Still learning, and new question regarding deleting primitives that are not visible from above. Note: I don't want camera(angle) culling. I just want to delete everything not visible from above. Here's an image illustrating it. Test case would be two deformed grids. *Typo in img: RayY*

Edited by joostjordens - Oct. 31, 2018 09:31:39

Attachments:
houdini_question.jpg (157.7 KB)

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BabaJ: Member; 2129 posts; Joined: Sept. 2015; Offline

Oct. 31, 2018 2:34 p.m.

Ray SOP might do the trick for you.

Attachments:
Remove not visible.hiplc (114.6 KB)


joostjordens: Member; 8 posts; Joined: Jan. 2017; Offline

Oct. 31, 2018 3:07 p.m.

Thank you @BabaJ! That's definitely an useful tool. However I'm still curious how I can create a group selection for faces that are not visible to a certain projection. For my specific example (image) I want to preserve the normal as is in the merge node, but I want to get rid of the geometry underneath for optimization purposes. Cheers!

Edited by joostjordens - Oct. 31, 2018 15:08:42

Attachments:
example.JPG (27.0 KB)

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BabaJ: Member; 2129 posts; Joined: Sept. 2015; Offline

Oct. 31, 2018 4:03 p.m.

Ray Sop has tick option to select “Intersect Farthest Surface”,

so then after you put down a group node.

Also has “Import Attributes from Hits” option too.

Edited by BabaJ - Oct. 31, 2018 16:08:02

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