Use shadertoy, see Little Shader Book ( 
a bit more complicated )
from the Collection of examples from discourse.threejs.org
Try examples
Shader - Shadertoy BETA
Shader - Shadertoy BETA
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Use shadertoy, see Little Shader Book ( a bit more complicated )
from the Collection of examples from discourse.threejs.org
Try examples
Shader - Shadertoy BETA
Shader - Shadertoy BETA