Hi, does anyone know of a shader, where
you can adjust the elumination of a model
by directly changing the brightness of a vertex (eg edge of a polygon).

So that you could for example say Vertex 10,24 and 54 of
a model should be darker. by this changing the elumination smoothing/interpolating over the triangle. Like in Gouraud Shading,
but that I can alter the elumination myself.




for example to put a darkened or colored area onta a model,
at specific vertex positions.