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<p class="MsoNormal">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.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here is some code for context: <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:Consolas"> osg::ref_ptr<osgVolume::Volume> volume = new osgVolume::Volume;
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"> osg::ref_ptr<osgVolume::VolumeTile> tile = new osgVolume::VolumeTile;
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"> volume->addChild(tile.get());
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"> osg::ref_ptr<osg::Image> image_3d = createTexture3D(data,xfer_table);
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"> osg::ref_ptr<osgVolume::ImageLayer> layer = new osgVolume::ImageLayer(image_3d.get());
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"> tile->setLayer(layer.get());
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"> layer->addProperty(new osgVolume::AlphaFuncProperty(0.02f));
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"> osg::ref_ptr<osgVolume:: RayTracedTechnique > technique = new osgVolume:: RayTracedTechnique ();
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"> technique->setNumSlices(200);
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"> tile->setVolumeTechnique(technique);
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"> layer->setMagFilter(osg::Texture3D:: NEAREST);
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"> layer->setMinFilter(osg::Texture3D:: NEAREST);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal">Here is how the output looks when I edit RayTracedTechnique.cpp to use NEAREST minFilter/magFilter. This is how I expect it to look<o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><img width="369" height="246" style="width:3.8437in;height:2.5625in" id="Picture_x0020_1" src="cid:image001.png@01D4F464.82427F50"></span><span style="font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal">Default RayTracedTechnique.cpp (which uses LINEAR minFilter/magFilter): (Not expected)<o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:Consolas"><img width="369" height="261" style="width:3.8437in;height:2.7187in" id="Picture_x0020_2" src="cid:image003.png@01D4F466.84604450"></span><span style="font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">How can I force the Texture3D object created by RayTracedTechnique to use NEAREST for minFilter/magFiltering?
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks, <o:p></o:p></p>
<p class="MsoNormal">-Sailesh<o:p></o:p></p>
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