Spikey's Procedural Polybook
Going to try and learn some of this black magic of procedural shading like Simon Thommes.
The first problem I encountered was, being used to working with colors, that black is no longer always 0.
Now you're working with values, so black can be negative, meaning that multiplying black with black can result in white (or grey, or black)!
It's not really a problem, but something to be aware of...
First challenge: a screw. Far from perfect, but it's working:
Actually took me a lot longer than expected, but I am feeling more confident now;)