The Art of Code | Shader Coding: Ray Marching Tips & Tricks @TheArtofCodeIsCool | Uploaded October 2019 | Updated October 2024, 3 hours ago.
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Shader starting point:
shadertoy.com/view/wdGGz3

Shadertoy for absolute beginners (if you've never shader coded before):
youtu.be/u5HAYVHsasc

Ray Marching for dummies (building a ray marcher from scratch):
youtu.be/PGtv-dBi2wE

Simple shapes explained (sphere, cube, cylinder, torus):
youtu.be/Ff0jJyyiVyw

Basic operators (translate, rotate, scale):
youtu.be/AfKGMUDWfuE