In article <Xns### [at] 204213191226>,
 "Rafal 'Raf256' Maj" <raf### [at] raf256com> wrote:

> Shouldn't real max_gradient be same for all bounding boxes ?

No. You obviously don't know what a gradient is...it is the slope, or 
"rate of change" of the function. The gradient of your function 
increases in the x and y directions, so bigger bounding boxes require 
higher max_gradient values. If you don't increase that value, the solver 
fails to find a surface.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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