[vtkusers] flat shading in vtk

[David Gobbi]

Oh, that's what you meant. Set "Ambient" to 1, and set "Diffuse" and
"Specular" to 0.  That should completely eliminate all directional
lighting.

   David


On Mon, Jan 25, 2010 at 2:43 PM, Liam Kurmos
<quantum.leaf at googlemail.com> wrote:
> On Mon, Jan 25, 2010 at 9:18 PM, David Gobbi <david.gobbi at gmail.com> wrote:
>> Try property->SetInterpolationToFlat().
>
> That produced flat shading, but the shading is still dependant on the
> surface normals. (just not interpolated/smoothed like gourad).
> What i want is a constant colour. Obviously that will mean object
> won't look very 3d but that is what i want in this case (i want to
> measure how much area of an object i can see by how many pixels of its
> colour i can count in the render window)
>
> I thought property->ShadingOff()/SetShading(0) sounded promising but
> they don't seem to be having any effect (i have a coloured sphere and
> it still gourad shaded).
>
> Also, I managed to turn the lights of with
> ren1->SetAutomaticLightCreation(0);
> but then i discovered there isn't an 'emissive color' property in vtk.
>
> Liam
>
>
>
>>
>>  David
>>
>> On Mon, Jan 25, 2010 at 2:05 PM, Liam Kurmos
>> <quantum.leaf at googlemail.com> wrote:
>>> Is there an easy way to disable shading in vtk?
>>> I want all pixels drawn for a polygon to be constant colour,
>>> independent of surface normals.
>>>
>>> I'm going to try having only an emissive color and turning off a
>>> lights, but now i'm stuck turning off the default light.
>>>
>>> ren1->RemoveAllLights();
>>>
>>> doesn't seem to be having any effect.
>>>
>>> searches like
>>>
>>> "site:vtk.org/Wiki/VTK/Examples getLights"
>>>
>>> are coming up blank, so i wonder if i'm on the right track.
>>>
>>> any help much appreciated,
>>>
>>>
>>> Liam
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>