Photorealistic Renders: How to Convince People Something Digital Is Real
lab.onebonsai.com
lab.onebonsai.com
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One of the more useful developments in photorealistic rendering in recent years is the "Principled BSDF" shader.[1] This brings together most of the shader features you need for photorealism into one convenient package. Disney/Pixar came up with this to get their workflow organized, and now it's a semi-standard. Blender and Unreal Engine now support it.
If you want to read up on photorealistic rendering techniques, read stuff from the last 3 years. It's getting easier.
[1] https://docs.blender.org/manual/en/latest/render/cycles/node...