[vtk-developers] Proposed changes to 3D texture mappers

[Randall Hand]

Shouldn't this be set with something like glGetIntegerv(GL_MAX_TEXTURE_SIZE
?

There are hardware limitations that restrict the maximum texture size..

On 12/19/06, Glen Lehmann <glehmann at atamai.com> wrote:
>
> Hi All,
>
> Occasionally, on the vtkusers list there are requests to remove the
> hard-coded limitations in VTK's 3D texture mappers.  We have removed
> these limitations within Atamai and we find it very useful on newer
> hardware.
>
> If there are no objections, I would like to address this issue without
> changing the default behaviour of the mapper:
>
> vtkVolumeTextureMapper3D:
>
> - new method SetMaximumTextureSize(int id, vtkIdType size)
>   - vtkIdType MaximumTextureSize[2];
>   - id = 0 will be used for 1-3 components (default = 128*256*256)
>   - id = 1 will be used for 4 components (default = 128*128*128)
>   - method will check for power-of-two
>
> - new method SetMaximumSamplingDistance
>   - default to -1.0 (unset)
>
> - modify method UpdateColorLookup such that this->ActualSampleDistance
> is less than or equal to this->MaximumSampleDistance
>
> vtkOpenGLVolumeTextureMapper3D:
>
> - modify IsTexureSizeSupported to use the values in MaximumTextureSize.
>
> On a new Mac Pro with the ATI X1900 graphics card, setting
> MaximumTexureSize[1] = 256*256*256, SampleDistance = 0.75, and
> MaximumSampleDistance = 0.75 looks great and provides fast interactive
> rendering.
>
> Objections, comments, or concerns?
>
> Glen
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>



-- 
----------------------------------------
Randall Hand
Visualization Scientist
ERDC MSRC-ITL
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