On 10/06/2016 08:24 AM, Orchid Win7 v1 wrote:

> Still trying to work out how you "average over several frames".
> ShaderToy is great fun, but so *utterly* undocumented... it's quite hard
> to figure out how to do anything.

OK, I think I've cracked it:

If you click the "new tab" button, it gives you another shader, that 
renders to Buffer A. If you then set iChannel0 to be Buffer A, you can 
do a texture2D(iChannel0, coords) to read the previous frame's pixel value.

Now you just need to set the main image shader to be a texture2D() 
lookup on Buffer A, and you're golden.

Not what you'd call "obvious"...

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