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I recommend The Ray Tracer Challenge: https://pragprog.com/titles/jbtracer/the-ray-tracer-challeng...

Guides you through a language-agnostic test-driven development of a primitive ray tracer. Could be done in a weekend or so of persistent work. And at the end you can bask in the glory of your fans running at 100% during rendering!

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+1 This book is excellent. Going through it w/ my daughter as a learning project now. I've worked on renderers in the games and vfx industries, and this is a very satisfying and relatively easy introduction.

Once finished, you can jump in to PBRT https://pbrt.org/ which has a new update coming out for rendering on gpu.

At what age have you started working with your kid to get her into coding, and what would you suggest as the first step?

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