Hi Gert, I presume these data is a geocentric databases, i..e it has the curvature of the earth built into it. For geocentric databases osgdem use the osg::ClusterCullingCallback to cull backfacing tiles. In this instance it looks like the set up of the ClusterCullingCallback is not correct.
One way to double check to see if ClusterCullingCallback is at fault is to disable CLUSTER_CULLING via osg::CullSettings. If it is cluster culling at fault then have a look at the set up of the variable. Note, the topmost point won't necessarily be the problem one that needs to be use to determine the control points, as a lower but nearer to the edge point might be seen first as you go round the curvature of the earth. Robert. On 4/16/07, Gert van Maren <[EMAIL PROTECTED]> wrote:
Hi guys, Question about culling/LOD in paged terrains. When a mountain (for example a volcano) is on the horizon, it gets culled when it should still be visible -> viewpoint close to the terrain. as you navigate up vertically, the tile pops back in. It seems visibility/invisibility of the tile is determined from the middle point but it should be from the highest point of course. Have a look at the screendumps. Same location but different elevation. Volcano is visible at higher elevation but not from the lower one. http://www.k2vi.com/osg/osgdem_lod1.jpg http://www.k2vi.com/osg/osgdem_lod2.jpg Only about 30m in elevation difference. Any settings that I can change? Regards Gert -- Gert van Maren Head of Research & Development K2Vi Virtual Reality Software Data Interface Technologies Ltd Phone: +64 21 2855581 Email: [EMAIL PROTECTED] Web: http://www.k2vi.com _______________________________________________ osg-users mailing list [email protected] http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/
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