On 12/6/2016 11:55 PM, clipka wrote:
>     #declare fClip = function(X,A) {select(X-A,A,X)}
>     #declare fD = function(C) {abs(fClip(C,-0.1)-0.5)-0.5}

That helped, thanks. I still had to raise max_gradient to get rid o 
every artifact though.

Mike

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