[vtkusers] Why is the image red?

[Bill Lorensen]

vtkTexture.h
  // Description:
  // Turn on/off the mapping of color scalars through the lookup table.
  // The default is Off. If Off, unsigned char scalars will be used
  // directly as texture. If On, scalars will be mapped through the
  // lookup table to generate 4-component unsigned char scalars.
  // This ivar does not affect other scalars like unsigned short, float,
  // etc. These scalars are always mapped through lookup tables.

On Mon, Dec 14, 2009 at 4:09 PM, David Doria <daviddoria+vtk at gmail.com> wrote:
> On Mon, Dec 14, 2009 at 3:58 PM, David Gobbi <david.gobbi at gmail.com> wrote:
>> The class vtkImageMapToColors can apply a lookup table to a whole
>> image.  As for vtkTexture, it has a set of rules that control when it
>> applies a lookup table, just like vtkMapper does.  Really, vtkTexture
>> is, itself, very much like a mapper.  The rules for how vtkTexture
>> maps the input data into something that can be used by the hardware
>> are described in the class documentation.
>>
>>   David
>
> David G,
>
> I was looking here:
> http://www.vtk.org/doc/nightly/html/classvtkTexture.html#_details and
> I still don't see anything about the rules it uses?
>
> I checked this:
>
> vtkstd::cout << "Map through LUT? " <<
> myTexture->GetMapColorScalarsThroughLookupTable () << vtkstd::endl;
>
> and it is 0, so that should mean that the image should be displayed
> based on its actual RGB values, right? I must still be
> misunderstanding.
>
> Thanks,
>
> David D.
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