Op 12/07/2020 om 03:55 schreef Bald Eagle:
> I stuck with it and disabused my mind of whatever was plaguing it.
> 
> Primarily, it was a problem caused by evaluating the latitude using the
> cartesian coordinates of the full volume of the isosurface contained_by shape.
> 
> That threw everything out of the valid -1 to 1 input range for the acos
> function.
> 
> Just for future reference:
> 
> #declare Length = function (X, Y, Z)  {sqrt(pow(X,2)+pow(Y,2)+pow(Z,2))}
> #declare Lat = function (X, Y, Z) {acos ( min(Y/Length(X, Y, Z), 1) )}
> #declare Long = function (X, Y, Z) {atan2 (Z, X)}
> 
> 
> The displacement-map isosurface is on the left, and the bump_map from the same
> image is on the right.
> 
> {whew}
> 

Impressive. Good work. Depending on the ultimate use, one can opt for 
the bump_map or the displacement_map. The displacement_map looks very 
good: down to what level of detail?

-- 
Thomas

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