On 22-10-2018 23:33, clipka wrote:
> It doesn't matter whether you use `#declare` or not; what really matters
> is whether there are actually rays shot at the isosurface during the render.
> 
> So a `#declare`d isosurface that is never actually inserted into the
> scene will never get a warning.
> 

@ clipka and Bill:

I am probably totally misunderstanding something, but I attach here a 
simple scene of the Kluchikov Ring with a on/off switch between a 
'declared' and a 'non-declared' isosurface. The 'non-declared' one shows 
a max_gradient warning at the end of the render; the 'declared' one does 
not.

-- 
Thomas

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