Hi, Robert Osfield wrote: > The view dependent overlay codes are similar in concept to view > dependent shadow map algorithms like perspective shadow maps, the > papers of this topic will give you an overview but won't be enough to > guide you through the details. One the OSG side it has to contend > with large model support (i.e. whole earth models) that academic > papers don't ever discuss so there are deviations, there is also the > aspect of getting it to work with a general purpose scene graph - real > implementations often are far more complex than demo ones with > constraints on the database.
Thanks for the info, will look at some papers. Yes, related to the whole earth DB, I wanted to add some functionality to cap the maximum distance from the eye that is used in the calculations. E.g. when close to the ground, I do not care about the overlay detail far away from the current position. I will first have to understand the code though :) > > As to what the bugs are.. my guess associated with compute the tight > bound on the overlay geometry, the intersection of this volume with > the view frustum and the intersection in turn of the projection of the > intersected volume with the decorated scene. The shaders are probably > OK, save for some GLSL implementation not being up to scratch. I will try to create a test case at some stage, or at least a video to show the problem. Could the frustum calc errors you fixed a few days ago have an influence on this? I have not tried the latest SVN. regards jp -- This message is subject to the CSIR's copyright terms and conditions, e-mail legal notice, and implemented Open Document Format (ODF) standard. The full disclaimer details can be found at http://www.csir.co.za/disclaimer.html. This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. MailScanner thanks Transtec Computers for their support. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
