[osg-users] Glowing Sphere Effect

[Sebastian Messerschmidt]

Hi Erik,

Do you mean glowing like non-lit but selfillumination? Then you're maybe 
after the setEmission property.
If you want a glow like bloom-effect, then you'll need some image 
postprocessing or texture tricks.
Maybe you can send some picture which resembles what you are trying to 
achieve.
BTW: your geometry doesn't have any normals, so lighting will be wrong 
in any case.


Cheers
Sebastian
> Hello everyone!
>
> I'm generating a sphere geode and I'd like to add a glowing effect in any variable color. I've only found one other similar topic on these forums but there was no answer. I imagine this must be possible, I just don't know how to do it. I've posted my code that creates the geode.
>
> Any and all help is very much appreciated!
>
>
> Code:
>
> // The center of my sphere
> osg::Vec3 tSphereCenter(0.0f, 0.0f, 0.0f);
>
> // Create the geode
> osg::ref_ptr < osg::Geode > pGeode = new osg::Geode;
>
> // Create the geometry
> osg::ref_ptr < osg::Geometry > pGeometry = new osg::Geometry;
>
> // The vertex array that defines the shape of the sphere
> osg::ref_ptr < osg::Vec3Array > pVertexArray = new osg::Vec3Array;
>
> //
> // Add vertices to pVertexArray using an icosahedron approach...
> // How this is done is not relevant to this question...
> //
>
> // Set this as the geometry's vertex array
> pGeometry->setVertexArray(pVertexArray);
>
> // Set the primitive set
> osg::ref_ptr < osg::DrawArrays > pDrawArrays = new osg::DrawArrays(osg::PrimitiveSet::TRIANGLES, 0, static_cast < GLsizei >(pVertexArray->size()));
> pGeometry->addPrimitiveSet(pDrawArrays);
>
> // Get the state set
> osg::ref_ptr < osg::StateSet > pStateSet = pGeometry->getOrCreateStateSet();
>
> // Create the material
> osg::ref_ptr < osg::Material > pMaterial = new osg::Material;
>
> // Set the sphere color to red
> pMaterial->setDiffuse(osg::Material::FRONT_AND_BACK, osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f));
>
> // Make the sphere shiny
> pMaterial->setShininess(osg::Material::FRONT_AND_BACK, 128.0f);
>
> // Set the material on the geometry's state set
> pStateSet->setAttribute(pMaterial);
>
> // Finish up with the geometry
> pStateSet->setMode(GL_NORMALIZE, osg::StateAttribute::ON);
> pGeometry->setStateSet(pStateSet);
>
> // Add this geometry to the geode
> pGeode->addDrawable(pGeometry);
>
> // Ensure the geode is visible
> pGeode->setNodeMask(0xffffffff);
>
> // Smooth out the material
> osgUtil::SmoothingVisitor sv;
> pGeode->accept(sv);
>
> // Add the geode to the scene
> pSceneGroup->addChild(pGeode);
>
>
>
>
> Thank you very much!
>
> Cheers,
> Erik[/code]
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=65690#65690
>
>
>
>
>
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