That's not too far from how I first learned about ray tracing. When I was a kid, I discovered DKBTrace on a BBS somewhere. Then DKBTrace evolved into POV-Ray

That's not too far from how I first learned about ray tracing. When I was a kid, I discovered DKBTrace on a BBS somewhere. Then DKBTrace evolved into POV-Ray and I got into that too. I remember things like being annoyed to discover that no matter how strong I made the sun-like light outside my building, it still wouldn't light up the interior which was in shadow; I knew nothing about global illumination methods or path tracing back then. But Perlin noise clouds in the sky were pretty cool, even if they made my 286 crawl pixel by pixel. Fast forward to today, and I've had the great fun of contributing a chapter (#31) to this book. And speaking of GLSL, I've already done that for my portion of this book. I chose to write my code samples in GLSL so that I could demo them verbatim in a web browser with https://www.shadertoy.com/view/tlcBzN https://www.shadertoy.com/view/tlcBzN. (Note that speed-wise, the FPS counter in Shadertoy is a bit misleading. Each frame is actually accumulating 32 samples per pixel.)