Hi Daniel, I faced the same problem
http://forum.openscenegraph.org/viewtopic.php?t=14354 How I fixed and hints from Robert. Hope it helps Nick On Fri, Dec 12, 2014 at 4:08 PM, Daniel Schmid < daniel.sch...@swiss-simtec.ch> wrote: > > Hi all > > Trust me, I searched the forum for a hint but couldn't find stuff that > could point me into a solution... > To understand the situation, please have a look at the screenshot. > I have tracks from a vehicle that are prerendered into a texture, and then > blended with underground during the main shader. Everything works fine and > I'm happy with the visual result. > > But there is one problem... > As soon as I move (rotate) my main camera, the track texture starts to lag > with the underground, it looks like if the modelview matrix are nomore in > sync. > > Technical details: > > The model view and projection matrices for the prerender camera are > calculated and passed into a uniform : > > > Code: > > ... > osg::Matrix MVP = m_Camera->getViewMatrix() * > m_Camera->getProjectionMatrix(); > > osg::Matrix MVPT = l_MainCamera->getInverseViewMatrix() * MVP * > osg::Matrix::translate(1.0,1.0,1.0) * osg::Matrix::scale(0.5,0.5,0.5); > > m_TextureMatrix = MVPT; > > m_Camera->accept(*a_cv); > ... > > > > > The uniform with the textureMatrix is added to the root scene nodes > stateset. In the shader, I calculate the TextureMatrix: > > > Code: > > vec4 ecPos = gl_ModelViewMatrix * gl_Vertex; > TexCoordTracksmap = tracksmapTextureMatrix * ecPos; > > > > > What is the reason for the lagging? What do I have to consider? By the way > I use ViewDependentShadowMap, and it also uses prerender camera and they > don't produce lagging shadow, so there has to be a solution. > > Can anybody help?[/code] > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=62044#62044 > > > > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > -- trajce nikolov nick
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