5DNick Posted July 12, 2022 Share Posted July 12, 2022 Dear Forumers, I have a FLIP mesh and long story short I need to cut the silhouette of it out of a big cuboid. Currently (tell me if I'm doing it wrong from the start, I tried about 3 completely different workflows but I think this one is best) I am using a transform matrix in an attribute VOP to flatten all the points into one plane (the silhouette) so what I need at some point is to Boolean this out of the cuboid. How can I trace an edge around the outside of this 2D "blob" of points? Then I will extrude and hey presto can do some Boolean action. Cheers in advance for any help 5D Quote Link to comment Share on other sites More sharing options...
ryew Posted July 12, 2022 Share Posted July 12, 2022 (edited) A screenshot/diagram or especially an example scene would help visualize what you are trying to do that's not working. There is a Trace SOP you can use on an image if you render a frame of the FLIP sim from your desired projection angle and use to cut out a dense grid, but if you've got a FLIP mesh, converting it to polygons would give you the fairly precise geo to boolean with? Edited July 12, 2022 by ryew Quote Link to comment Share on other sites More sharing options...
5DNick Posted July 12, 2022 Author Share Posted July 12, 2022 My scene file has so much huge caching it wouldn't be practical? I thought I gave quite a precise description of what I wanted to achieve? I think your idea with the Trace SOP might work. I'll try and do that. Quote Link to comment Share on other sites More sharing options...
PixelNinja Posted July 13, 2022 Share Posted July 13, 2022 (edited) Posted a couple of approaches below Edited July 13, 2022 by PixelNinja Quote Link to comment Share on other sites More sharing options...
PixelNinja Posted July 13, 2022 Share Posted July 13, 2022 Here's a couple of approaches. Neither are perfect but should get the job done. Method 1: Triangulate 2d, then delete long edges to hopefully cull the exterior polys from the silhouette. Method 2: Attibute transfer from the flattened points onto a subdivided plane in order to cut out the silhouette. Higher subdivs give a more accurate result. Squab_bool.hipnc Quote Link to comment Share on other sites More sharing options...
5DNick Posted July 13, 2022 Author Share Posted July 13, 2022 Brilliant. Will try these too. Thanks. Quote Link to comment Share on other sites More sharing options...
Neronie Posted July 31, 2022 Share Posted July 31, 2022 You could also try the Geometry COP, which does a sort of projection along a specified axis and extracts alpha. Then pass that into a Trace SOP to polygonize the result. 1 Quote Link to comment Share on other sites More sharing options...
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