Sooo... I have been able to apply the sobel filter to our output.Thanks to the reflections assignment :).I tweaked a readily available sobel filter shader for getting the output as desired by us.I have also tested it with alpha blended output.This means that we can now render our hair output directly to the display and sobel output to a quad and then align the two to get the desired looking result.Also attaching the output of sobel with alpha blending.The image has turned out to be poor in quality but you can see the outline of the sphere below the green sphere.It looks proper on a computer display.
-Chitranjan
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