HI Gerwin, I've done a little bit of point cloud vis, using small scale laser scanner data rather large scale terrain.
One technique I never tried, but did think about, was rendering the pointer cloud to a texture to generate a height texture, which is then used as a source for a vertex program that deforms a regular mesh to the alloted positions. The rendering to the height texture you'd need to splat the point with a an weight decreasing weight as you go out form the center of the point. Robert. On Sun, Jan 18, 2009 at 10:33 AM, Gerwin de Haan <[email protected]> wrote: > Hi Gordon, > > We have many different point-cloud datasets from both terrestial and > aerial LiDAR scans, most of them in the range of ~20M points (some > with intensity values and/or with rgb values), but some sets total > over 2B points divided in tiles. I now build either a quad- or oct > tree datastructure with LODs that take a subset from each tile. The > results are promising and really have a different feel than 2.5D > terrains. I was surprised even a lot of people in the remote-sensing > field have never explored full 3D point clouds interactively (thanks > OSG!). > > We're still in a prototyping stage though (python and osgswig help > :-), and I am now experimenting with balancing point rendering size, > LOD levels and subsampling from pointsets in order to get "just > enough" points on-screen for a solid visual impression with a high > frame rate. Real framerates are difficult to give at this point, as > they are now really card and view dependent. > > Currently, a scan of the whole of the Netherlands is in progress with > a minimum sampling of 10 xyz points per square meter (a 5 year > project). I am using a small subset of this now for experiments, but > hope to be able to provide smooth interactive exploration for the > whole of this scan. > > If you like we can discuss more detailed aspects off the list. What is > your application / data for? > > Gerwin > > > On Sat, Jan 17, 2009 at 4:33 PM, Tomlinson, Gordon > <[email protected]> wrote: >> HI Gerwin >> >> Interesting screen shot >> >> Being noisy now ;-) what sort of numbers in points are you using/getting >> with you point clouds >> >> We are doing similar work it seems >> >> >> Gordon > _______________________________________________ > 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
