Hi Kim, Thank you for your help. I had played with getSurfaceHeight() before and did not see any affect on the reflection. What did help though was modifying _reflectionMatrix inside OceanScene. I removed the const and just did a makeTranslate() inside the contructor where I transformed the OceanSurface. That *appears* to have corrected the reflection. Integrating all these changes into an easily modified variable shouldn't be too bad, but I am not sure if I have all the proper matrixes being modified yet. I only am concerned with the ocean surface, and not so much underwater effects.
Regards, Matt On Wed, Aug 12, 2009 at 2:33 PM, Kim Bale<[email protected]> wrote: > Hi Matthew, > > Yes that is, unfortunately, expected behaviour. > > The clipnode that is used for the reflections is set in OceanScene.cpp > > osg::ClipPlane* reflClipPlane = new osg::ClipPlane(0); > reflClipPlane->setClipPlane( 0.0, 0.0, 1.0, _oceanSurface->getSurfaceHeight() > ); > _reflectionClipNode = new osg::ClipNode; > _reflectionClipNode->addClipPlane( reflClipPlane ); > > The problem as you can see is the _oceanSurface->getSurfaceHeight(). > In FFTOceanSurface this value is computed when the mipmap geometry is > initially computed so that it takes the average height of all the > tiles. Unfortunately I forgot to add a setter for this function to > override the computed value. getSurfaceHeight() is also used for a > variety of other effects like silt and switching on the underwater > effects. > > I'm afraid I don't have time to fix this at the moment. But it should > be quite easy to add a setSurfaceHeight( float height ) function to > FFTOceanSurface which overrides the _averageHeight variable within it. > However it will need to be set in the following order: > > FFTOceanSurface* ocean = new FFTOceanSruface( ... ); > ocean->build() <- height is set to average wave height. > ocean->setSurfaceHeight(1.f) <- override computed value. > >>Though I believe the problem with the reflection is because the bottom >>of my landscape scene is transparent. > > Yes I believe you're seeing the underside of your terrain in the water > there, a result of the clip plane being set too low. > > Sorry I can't be of more help. > > Kim. > > 2009/8/12 Matthew Lehner <[email protected]>: >> I was attempting to transform the ocean surface along the z-axis as >> described Kim using a MatrixTransform in the constructor of OceanScene >> where OceanSurface is added to the Scene as a child node. The surface >> is indeed transformed properly, but the reflection it completely >> wrong. First off it gives the illusion the surface is still at the >> original z-axis position, but it also seems to be reflecting the top >> of my landscape onto the water which doesn't seem correct to me. >> Though I believe the problem with the reflection is because the bottom >> of my landscape scene is transparent. I am more interested in fixing >> the z-offset reflection problem. I have attached a screen shot of the >> reflection I am seeing. >> >> This is the code I am using to transform the ocean surface along the z-axis. >> >>> osg::MatrixTransform* mt = new osg::MatrixTransform( >>> osg::Matrixd::transform(osg::Vec3d(0.0, 0.0, 1.0)) ); >>> mt->addChild(_oceanSurface.get()); >>> addChild(mt); >> >> Screenshots of the reflection can be seen here: >> http://www.xavia.org/osgocean/ >> >> Regards, >> >> Matt Lehner >> _______________________________________________ >> osg-users mailing list >> [email protected] >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
