epatrickUA Posted March 14, 2020 Share Posted March 14, 2020 Is there a way to use this technique and only keep the faces that the rays hit first, and to delete the faces that are occluded by shadow (or what would be in shadow)? Not sure if this makes sense, but I basically have a messy geo, with a bunch of inner faces. Normals facing in and out everywhere and I'd like to just be able to keep the outer most geometry. And I was thinking that using a set of lights might be a way to just select those outer faces. Any help is greatly appreciated. Quote Link to comment Share on other sites More sharing options...
djiki Posted March 20, 2020 Share Posted March 20, 2020 Houdini allows you to sort primitives on many different criteria and there are a lot of tools for filtering different types of data and isolate specific group of primitives. However, methods and technique you will use, much depends on your geometry. If you found "illuminating" method as one that will solve your problem, well, yes, you can do that. Forget about light. You have RAY sop node. Connect let's say XY grid in first input and torus in second. Make sure normals (or your custom attribute) from grid point to direction of torus and make sure grid has enough divisions. That grid will be your "light". DeleteByIllumination.hipnc Quote Link to comment Share on other sites More sharing options...
konstantin magnus Posted March 20, 2020 Share Posted March 20, 2020 Find out which primitives are visible: https://forums.odforce.net/topic/44518-solid-flat-colors-and-no-aa/?tab=comments#comment-209549 Quote Link to comment Share on other sites More sharing options...
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