The original image
3000 iterations, 120 seconds
2000 iterations
After 500 iterations(32 seconds), pixels with height values between 0.1 to 0.000001 are shown in red. It means the narrow areas around the hair have a lot almost-zero heights.
500 iterations
100 iterations
That red visualization is fantastic. What does it look like with different thresholds? It seems like it is close to a useful result by itself!
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