raytk
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Raymarching shader toolkit for TouchDesigner
Either onto faces or possibly also onto vertices. This can currently be done with combinations of mirrorQuadrant and rotation but it should be easy to set up.
It seems to work after toggling cooking a few times.
https://www.shadertoy.com/view/DdXyzr
Possibly as an option within boxFrameSdf to have it only open along one axis. Also a 2D SDF, possibly as a part of rectangleSdf.