On 6/15/20 11:44 AM, Alain Martel wrote:
> Le 2020-06-15 à 07:07, William F Pokorny a écrit :
...
> I see, huge gradient similar to what we can expect when using the 
> gradient or radial patterns in an isosurface.
> 

Yes, suppose similar if using POV-Ray gradient, radial and seeing the 
clamp. Povr if the normal 0-1 fmod-ish clamping is on, and your 
isosurface is catching the fmod clamping so to speak(1).

Where off in povr the gradient pattern's 'gradient', for example, is 
good/linear.

Bill P.

(1) And not using a wave modifier like triangle... It depends. General, 
simple statements/rules are hard to come by with isosurfaces. With our 
current solver low gradients being key for good performance is one. 
Gradient warnings have always been iffy, though often enough helpful.

Change a set of rays approach to an isosurface and the gradients are 
often different. Tighter bounding helps for both the usual ray misses / 
hits the bounding box reasons - and that smaller dimension(s) along the 
ray help with the 'effective' gradients.

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