[vtkusers] Shading Problems with Para.Surf.

[Elias Breunig]

Thanks that did the trick! Seems like I've to look into the
derivatives one more time....

Elias

2010/10/22 David Doria <daviddoria at gmail.com>:
> On Fri, Oct 22, 2010 at 7:52 AM, Elias Breunig
> <elias.breunig at googlemail.com> wrote:
>>
>> Dear all,
>>
>> I've written a Parametric Paraboloid class that generates paraboloid
>> surface data. It is based on vtkParametricEllipsoid and I basically
>> just exchanged the fundamental equations and definitions. Works fine
>> so far, but when I render the surface i get a somehow strange shading
>> effect on the surface, to be more prescise, a quard-foil of dark areas
>> (see attached image). Has anyone an idea where this might originate
>> from and how to get rid of it. I played around a bit with ambient and
>> diffuse parameters but couldn't achieve any effect at all.
>>
>> Thanks for advice
>>
>> Elias
>
> My guess is that your normals are incorrect. Try:
> actor->GetProperty()->SetInterpolationToFlat();
> to turn off shading which uses the normals and see if looks correct.
> David