I fell for this when I was a kid on Byond. The idea guy thought he was J. R. R. Tolkien. My sprite artist friend joined me. He was vague about what he wanted and even though we had been making everything he asked of us he brought another coder in, a couple years younger than me, I was a teen and he was 13. When he was given my code he called me boring and started throwing together some stuff. He ended up writing... Source: about 3 years ago

Many years ago in grad school, I did matrix multiplication for a physics simulation, directly on the GPU, using JOGL. There may be more modern ways to do it, though. Source: over 1 year ago

I tried learning the classic Java version and had modest success. But as soon as I needed to pass large arrays to the shader I got lost in the complexity. I know it requires some kind of interaction with PGL on a PGraphicsOpenGL which "includes a full GLES 2.0 interface" and is documented elsewhere... But you practically need a teacher just to navigate your way through it all. Source: over 2 years ago