On 2022-01-26 09:39 (-4), Cousin Ricky wrote:
> 
> I just looked back at my images, and though f_ridged_mf() showed no
> signs of inversion, f_ridge() most certainly did.  However, I have not
> checked to see whether the inversion was due to bump_size.

The f_ridge() inversion is unrelated to bump_size.

For reference, these are the functions used for the normals:
  f_ridged_mf (x, y, z, 0.1, 3, 7, 0.7, 0.7, 2)
  f_ridge (x, y, z, 0.1, 1, 7, 0.7, 0.7, 0)

Note: The scene file was written for POV-Ray 3.6; the last argument to
f_ridge() should be changed to 2 for 3.7+ compatibility.

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