To experiment with the basic shaders, we've created an example where you can play around with most of the shaders and see the effects directly in the scene. You can find this example at 07-shaderpass-simple.html. The following screenshots show some of the effects.
The THREE.BrigthnessContrastShader effect is as follows:
The THREE.FreiChenShader effect is as follows:
The THREE.KaleidoShader effect is as follows:
The THREE.MirrorShader ...