Hi, Yes you can do it with a osg::BlendFunc, just like that :
osg::BlendFunc *blendFunc = new osg::BlendFunc(); osg::BlendColor *blendColor= new osg::BlendColor(osg::Vec4(1, 1, 1, 0.0 )); blendFunc->setSource(osg::BlendFunc::CONSTANT_ALPHA); blendFunc->setDestination(osg::BlendFunc::ONE_MINUS_CONSTANT_ALPHA); node->getOrCreateStateSet()->setAttributeAndModes(blendFunc, osg::StateAttribute::ON); node->getOrCreateStateSet()->setAttributeAndModes(blendColor, osg::StateAttribute::ON); Then just update the blendColor's constant color (with blendColor->setConstantColor()) by changing its alpha value. I've done it by making a node callback which updates this value using a simple timer. On Feb 7, 2008 12:56 PM, Johan Johnsson <[EMAIL PROTECTED]> wrote: > Hey all! > > I need a simple fade effect, is it possible to use osg::BlendFunc for > this? > > osg::ref_ptr<osg::BlendFunc> wakeBlend = new osg::BlendFunc(); > wakeBlend->setFunction(osg::BlendFunc::DST_COLOR, osg::BlendFunc::ZERO); > > I whould like to increase the alpha value each frame, is there any way to > define the alpha or transparacy using this osg::BlendFunc?, its actually > only a model i load, which i want to fade (its a common bitmap) in and out > over 2 seconds. > > -- > Mr. Johan Johnsson > AutoSim AS, Strandveien 106, 9006 Tromsø > Visit us at http://www.autosim.no > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > -- Serge Lages http://www.tharsis-software.com
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