Two dimensional reaction diffusion patterns were created in realtime since the analog era of camcorders and tube tv-s. Later with the first generative image softwares you could render them realtime. Nowadays powerful gpu-s made it possible to have one extra dimension. The three dimensional realtime reaction diffusion model displayed is generated in a cubic domain. You can interract with the simulation with the help of depth cameras that track you. RGB normally refers to red,green and blue in the context of a digital image, but since the gpu-s calculate the simulation, they use the r,g,b values to encode positions in the 3 dimensional space(x,y,z).