Always intrigged by shaders and what they can do, I first discover them at work when helping graphists to build effects in Unity 3D. Then I forget about shaders. But…
Start playing with “blobs” (isosurfaces)
Bellow the evolution of my tries.
Then add more ‘blobs’, layers and use color map to get these:
Adding perlin noise
For more info on perlin noise, see this video.
Playing with color and shape merge
Playing with fract
Fract allow to keeping only the fractional part of a value, 1.2456 => 0.2456. This allow you to create square spaces to handle local drawings.
Playing with Voronoy
For more info on Voronoy, see this video.
Playing with polar coordinates
For more info on polar coordinates, see this video.
Changing from x,y coordinates to angle and length.
Playing with raymarching
Ray-marching or sphere-tracing is a simplified version of ray-tracing, that allow to build a 3D renderer in a single shader file. For more information see this great video.