原文
An interactive geometry primer
A ray tracer renders images by casting rays from a camera through every pixel and finding where each ray hits a surface. This tool explores the core mathematical question: how do you compute that intersection?
Choose a geometry — sphere, cylinder, or torus — and explore it across three lenses:
📐
Theory
Derive the intersection polynomial step by step
🎮
Intuition
Aim a ray interactively and watch the roots move
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Code
Edit live GLSL — see the shader render in real time