Hi Eric,<br><br>Try removing all points and modifying the same color transfer function, instead of creating a new one... It seems to work for us.<br><br>Shash<br><br><div class="gmail_quote">On Tue, Dec 21, 2010 at 6:33 AM, Eric Foo <span dir="ltr"><<a href="mailto:foo@iastate.edu">foo@iastate.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Hi all,<br>
<br>
Does anyone know how I can update the color transfer function for a vtkOpenGLGPUVolumeRayCastMapper type volume?<br>
<br>
The volume is constructed like so:<br>
<br>
_volumeProperty = vtkVolumeProperty::New();<br>
_volumeProperty->SetColor(_color);<br>
_volumeProperty->SetScalarOpacity(_opacity);<br>
_volumeProperty->SetInterpolationTypeToLinear();<br>
_volumeProperty->ShadeOff();<br>
<br>
_gpuVolumeMapper = vtkOpenGLGPUVolumeRayCastMapper::New();<br>
_gpuVolumeMapper->SetImageSampleDistance(_imageSampleDistance);<br>
_gpuVolumeMapper->SetSampleDistance(_sampleDistance);<br>
_gpuVolumeMapper->AutoAdjustSampleDistancesOff();<br>
_gpuVolumeMapper->SetInput(_voxels);<br>
<br>
_volume = vtkVolume::New();<br>
_volume->SetProperty(_volumeProperty);<br>
_volume->SetMapper(_gpuVolumeMapper);<br>
<br>
To swap between different predefined color transfer functions, I call:<br>
<br>
_volumeProperty->SetColor(someNewColor);<br>
<br>
This is where the problem starts. The only way the volume will update to the new color is if I delete the current volume mapper and then recreate it with the new color transfer function, which is bad for performance. I've tried calling _volume->Update() and _gpuVolumeMapper->Update(), which doesn't seem to work.<br>
<br>
Any help or ideas would be appreciated. Thanks in advance!<br>
<br>
eric<br>
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</blockquote></div><br>