Hi Frédéric,I've been having the same problem with a large scene created and exported with 3ds Max.
If I tried to change the material of an specific node osg::StateSet* stateset = geode->getOrCreateStateSet();osg::Material *material = new osg::Material;
material->setAmbient(osg::Material::FRONT,osg::Vec4(color)); material->setDiffuse(osg::Material::FRONT,osg::Vec4(color)); material->setAlpha(osg::Material::Face::FRONT_AND_BACK,color[3]); material->setColorMode(osg::Material::AMBIENT_AND_DIFFUSE); stateset->setAttributeAndModes(material, osg::StateAttribute::OVERRIDE); stateset->setMode(GL_BLEND,osg::StateAttribute::ON); stateset->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);the only result I've been obtained is an opaque geode. The only way this code works ok is disabling the depth test. I've been working with this code in version 1.2 and it was ok, but with the 1.9 dev revision, I have the same problem as you.
Hope someone help us with this because the solution I found was implementing a shader to change the color of the geode.
Regards Marta Frédéric SPEISSER escribió:
Hi all,My aim : To have the possibility to modulate the level of opacity of a node in my scene.While doing that I encountered two problems. Firstly :I'm using color indexed surface to define my objects. But if I want to keep the color information I cannot assign a material to my object, so I cannot modulate the alpha value of my object... Since I cannot do that, I'm using a BlendColor and a BlendFunc set to GL_CONSTANT_ALPHA, GL_ONE, and I change the alpha value in my BlendColor to have different level of opacity for my object. Is that the right solution ? Can I do better ?Secondly :Blending does not give good results when I'm not disabling GL depth test... Strange ?! So I must do as following :node->getStateSet()->setMode(GL_BLEND,StateAttribute::ON);node->getStateSet()->setRenderingHint(StateSet::TRANSPARENT_BIN); node->getStateSet()->setMode(GL_DEPTH_TEST,StateAttribute::OFF);Without saying that it causes incoherency when several objects are in the scene. I attached a image resulting of blending without depth test and another with depth testing.Someone already encountered this problem ? Have someone a clue ? I thank you for advance, Frédéric. ------------------------------------------------------------------------ ------------------------------------------------------------------------ ------------------------------------------------------------------------ _______________________________________________ osg-users mailing list [email protected] http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/
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