Silhouette from Camera Perspective - Houdini Tutorial

Outlining a mesh as seen by the camera using normal device coordinates (NDC).
File: procegen.konst...

[@KonstantinMagnus]

Make sure to also watch this similar method: kzbin.info/www/bejne/rpfVlJpqns2CnK8

[@Ayred]

You could also use @P = fromNDC(cam,@P) after setting P.z to a distance value of let's say 2.0. Then the silhouette is transformed back into the camera view having a distance of 2.0 from your camera. No need for the aspect correction afterwards, though. :)

[@syntheticperson]

Very cool

[@kasali2739]

cool, something like projection on screen. This is cleanest method I ever seen. Is there a way to make cuts on a geometry using texture? I mean not subdivided geometry that we could vertex split, but single triangle for example?

[@luisfoscg]

cool! this method does run into some issues with complex meshes, triangulate 2d can fail. also have to handle edge cases for holes

[@KonstantinMagnus]

Yes, you are correct. The hole SOP can perhaps handle inside holes. If triangulating causes problems, you could look into transfering the distance to the flattened mesh to a new grid and do the cutting there.

[@adrian-kewell]

the pig line how to use on the pig head from camera

[@khomatech0]

yes absolutely