RaycastingIQ’s intersectors and also this shadertoy playlistWriting a Basic Ray Tracerhttps://github.com/Vertexwahn/FlatlandRT - has useful articlesRendering Simple Shapes (Sphere, Cube, Disk, Plane, etc.)# OpenGL stuff and graphics in generalLearning Modern 3D Graphics ProgrammingOpenGL Step by Step - OpenGL Developmentlearnopengl.com# ExamplesTheCherno/RayTracing: YouTube ray tracing seriesssloy/tinyraytracer