I have come across a particular question from a new user and i, at first, wasn't sure what they were asking (hence my nonspecific answer). After giving it a few more reads it seems like they literally just want someone to implement some functionality in code and give it to them.
While questions regarding graphics programming are on topic, this seems like a low quality question that can't be properly answered in a single way.
The link to that question is this: How can I implement this BSDF?
I have provided an answer that touches on some of the theoretical basis and provides external resources to solve the problem knowing that it wasn't an actual answer to the question being asked in the hopes that it would still be of use to the asker. I refrained from commenting about the nature of the question on it since i wasnt sure if it was actually off-topic.
What do you think?