I’m attempting to re-create the Principled BSDF node using other Blender nodes, specifically for Cycles.
I started by looking at the Principled BSDF OSL file (linked below). I read the code and started constructing a node tree based on that using math nodes and shaders, making small corrections where needed.
Link to the Principled BSDF OSL: node_principled_bsdf.osl · rB
However, I’ve encountered an issue. When adding the specular component to the Prinicpled BSDF, the OSL file uses this:
BSDF = BSDF + specular_weight * microfacet_ggx_aniso_fresnel(...) //This is simplified to make it smaller
I can not figure out how to recreate this part in nodes.
specular_weight is easy to calculate. It’s here:
But I can’t seem to figure out how to recreate
microfacet_ggx_aniso_fresnel(). And so I’ve come here to ask for help.
Is anyone able to help by showing me a node setup that can recreate this shader?