Experiment: Add noise to sdf output

[caseyreed]

Hi guys!

Thank you very much for your great work! I really appreciate it and I am fascinated by the fast and high quality results.

At the moment I'm trying out some things to see how the results change. For that I would like to add (Gaussian) noise to the output of the sdf to see how this affects the output. Unfortunately, I have not found the place in the code where I could do this. Since I don't have that much experience with CUDA yet, I would highly appreciate if you could help me. Where in the code could I add the noise?

Thanks a lot in advance for the support!