Sorry for the delay, I missed a few message these days.
Daniel Rossberg : "Potrace doesn't interact with a ray-tracer. What would be necessary is to group points and areas by object and depth information from the ray-trace and use these as inputs to a potrace algorithm."
Yes, normally, potrace only need a bipmap. My idea was to execute potrace on an "improved" bipmap, wich will contain more information as the depth and the pixel/object links.
Daniel Rossberg :"On the other hand one could use the output of rtedge as input for potrace to get an SVG or PDF vector file."
I think it will be the first part (working on "improved" bipmap whithout considering all the arguments). It was my idea...
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