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Thanks for all the suggestions especially Egon, that put me ahead of my learning curve. I put most of the art pipeline I'm developing here: https://github.com/thrisp/art includes the Cosmic filter/shader I opened with here. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.