I am quite new at shader development, and more generally to the 3D world so I might be missing something really stupid.

I am trying to modify an existing shader (pHairTK from Puppet). Originally, this shader provides multiple outputs with framebuffers. I need to change that so the differents outputs are handled separately in XSI. So I changed the SPDL to take into account the different results. And now nothing renders.

The code is very long, so it is hard to provide it here. But maybe someone here ran into a similar problem ?