I want to use an alpha texture to cut a geometry. Basically want a trace node but can work with an input geometry with any shape.
My idea is to have uved geometry. Then I map a black and white texture to that geometry according to the uv. At the edges of the black and white geometry, a bunch of points are generated to draw a line to cut the geometry.
However, I do not know how to get the position of the black and white texture in world space of the geometry. Any help is very much appreciated!
I tried scattering many points on the geometry and transfer the texture color to point color, then removing the black colored point to cut the geometry. But I think this method is not efficient and elegant enough. The contour of generated geometry is usually too rough and not precise enough.
