For vectors, You can use the model view matrix, but omit the translation component. I believe the call is Matrix::transform3x3. On Aug 11, 2014 12:40 PM, "Bram Vaessen" <bram.vaes...@gmail.com> wrote:
> Hi, > > In my shader I would like to have the direction of the light (sunlight) in > eye-space, and since it doesn't vary per vertex I would like to > pre-calculate it in OSG. > > I'm not sure how to do this, I thought it would make sense to multiply the > view matrix with the direction of the light like this, but I feel like I'm > not sure what I'm doing. Anyone can help me out with this? > > > Code: > > //to set up > osg::Vec3f lightDir(1.f,2.f,-2.f); > lightDir.normalize(); > > //and then each step... > osg::Vec4 lightDirEye = worldCamera->getViewMatrix() * > osg::Vec4(lightDir,1); > lightDirUniform->set(osg::Vec3(lightDirEye.x(), lightDirEye.y(), > lightDirEye.z())); > > > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=60630#60630 > > > > > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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