Hello,
I am new to MadMapper and, since I started working with custom shaders, very interested in it's capability in that part. So far I worked with GLSL shaders only, but after looking through the ISF Docs, I managed to port a few shaders to MadMapper. I am still having a few problems, though. Are there any docs specifically for the ISF syntax in MadMapper? For example, if I use the ISF generated RENDERSIZE, this is not the material-size in MadMapper, but the size of the whole render window. If I use texCoord to call the main function (like materialColorForPixel suggests), only a small fraction of the shader gets rendered. If I use gl_FragCoord, the shader gets rendered properly, but it seems to get rendered "behind" the screen and the Quads act as a kind of mask.
Here you can see me comparing the behaviour of the MadMapper Clouds Material (works as expected) with two shaders I ported from shadertoy (weird mask-behaviour):
https://imgur.com/a/rsVSYtr