Hi Rob, I don't see any reason why one would implement an osgFX::Effect using RTT. The idea of osgFX is that you decorate the subgraph that you want the effect on, this could be the whole scene, or just a single object.
Robert. On Dec 19, 2007 9:25 PM, Robert Hansford <[EMAIL PROTECTED]> wrote: > Hi all, > For one of the projects I'm working on I need to have several render passes > which operate on the rendered scene as a texture. I was wondering if I > could base the implementations on the osgFX::Effect class. I know the > existing effects are all based around simply using different statesets, but > would it be an inappropriate use of the Effect class to write Techniques > which contain a render-to-texture camera and then operate on that texture? > > A few examples of the sort of thing I'm doing are as follows: > 1) blurring the image using a Gaussian kernel. > 2) computing the min and max pixel value in the image in order to > "downgrade" HDR imagery to get the expected effects when an unusually bright > object appears in the field of view. > 3) adding noise to the image to simulate a poor quality camera. > > I am a little concerned that this may not be a proper use for the Effect > class as this sort of process probably has to be done at the root of the > scene graph, where as the existing effects can be applied to any subgraph. > However, I do like the idea of implementing these processes as nodes in the > graph that can be saved out to .osg files etc, but I can probably achieve > this by writing my own class rather than extending Effect (though that would > take me more time). > > I would greatly appreciate hearing people's thoughts on this matter. > > Thanks in advance, > > Rob. > > _______________________________________________ > 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
