Where to learn to write shaders for Blender

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1

Is there anywhere on the internet where one can learn to write Blender shaders from scratch?

2

Exactly what do you mean by “write Blender shaders”?

Do you just mean creating procedural textures, or you want something heavier like creating new closures?

3

Creating new closures. I’m asking out of curiosity.

4

I would start by readind “Physically Based Rendering: From Theory To Implementation”, from Matt Pharr, Wenzel Jakob, and Greg Humphreys.

5

The only way to write shaders “from scratch” in blender is AFAIK the OpenShadingLanguage Docs-Blender Manual: Render → Shader Nodes (OSL) …
Everthing else is “just” using the provided shaders and do some “mixing” with them in the Shader (nodes) Editor.

And to learn a shading language…

6

Thought is not possible to write closures with OSL… just procedural textures and combinations of the existent closures.

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7

Good point…