I have RayTracedTechnique putting graphics on the screen, but things aren't
rendering correctly. The culprit is the 'osg::Texture3D::LINEAR' choice that is
used by default as the min/mag filter for the Texture3D object created by
RayTracedTechnique. I'd like to change to NEAREST as I'm working with
segmented/ labeled volume. The problem I'm seeing is that when I use the
setMinFilter and setMaxFilter methods on the associated ImageLayer, things
aren't getting updated for some reason. I know that's what's going on because
if I actually edit the code in RayTracedTechnique.cpp to use NEAREST for the
min/max filter on the Texture3D, I get the texture I want on the screen.
Here is some code for context:
osg::ref_ptr<osgVolume::Volume> volume = new osgVolume::Volume;
osg::ref_ptr<osgVolume::VolumeTile> tile = new
osgVolume::VolumeTile;
volume->addChild(tile.get());
osg::ref_ptr<osg::Image> image_3d =
createTexture3D(data,xfer_table);
osg::ref_ptr<osgVolume::ImageLayer> layer = new
osgVolume::ImageLayer(image_3d.get());
tile->setLayer(layer.get());
layer->addProperty(new osgVolume::AlphaFuncProperty(0.02f));
osg::ref_ptr<osgVolume:: RayTracedTechnique > technique = new
osgVolume:: RayTracedTechnique ();
technique->setNumSlices(200);
tile->setVolumeTechnique(technique);
layer->setMagFilter(osg::Texture3D:: NEAREST);
layer->setMinFilter(osg::Texture3D:: NEAREST);
Here is how the output looks when I edit RayTracedTechnique.cpp to use NEAREST
minFilter/magFilter. This is how I expect it to look
[cid:[email protected]]
Default RayTracedTechnique.cpp (which uses LINEAR minFilter/magFilter): (Not
expected)
[cid:[email protected]]
How can I force the Texture3D object created by RayTracedTechnique to use
NEAREST for minFilter/magFiltering?
I'm using OSG 3.0. I know I need to upgrade, but I didn't see any way to do
this even in OSG 3.6
Thanks,
-Sailesh
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