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different color on backside of surface


I want to animate a 3D plot. Therefore I generate tachyon rendered implicit plots which I then send to ffmpeg. This works quite well. The only disadvantege, is that it's during the video hard to distinguish which side of the surface one sees. Therefore I want to change the color of the backside or at least increase the shadow.

I already tried some stuff with the tachyon raytracer building a scene. But this does not work for implicit plots. The solution given here seems not to be very usefull in this context.

Is there perhaps a simply trick, which does the job?