An other Interesting paper http://www.informatik.uni-rostock.de/~hc009/publications.html
On Thu, May 14, 2009 at 11:53 AM, David Spilling <david.spill...@gmail.com>wrote: > Kim, > > > it does sound difficult to implement as a general case. > > > Actually, I think that the only way to meet all current techniques with as > common a scenegraph structure as possible is to render the heightfield to > texture (generated somehow, e.g. FFT on CPU, sum of sines, FFT on GPU), then > use vertex texture fetch to draw the vertices (e.g. projective, tiled, > etc.). > > The main drawback (IMHO) is current performance : vertex texture fetch is > slow on many cards; even fewer seem to support GL_LINEAR in hardware (which > you need). Undoubtedly this will get better, but when I looked at this a > little while ago, it was sluggish in comparison to techniques not involving > VTF. > > To be honest I've don't think I've seen a real time >> ocean simulation with geometric wake formations, they usually just use >> texture overlays. > > > I agree; vertex deformation by wakes is... uncommon (we've done it in the > past, but for very very application specific reasons that probably wouldn't > be appropriate). However applying a deformation to your _normal_ field works > easily, and works especially well at high altitudes in calm seas when you > can't / shouldn't be able to see the vertices anyway. It's equivalent in > construction to the way the surface wake foam textures work. > > One other point : for semi-infinite tiling oceans, have a look at the new > instancing stuff that I recently saw contributed into OSG. I haven't played > with yet it myself, but just repeating the base (high res) tile as an > instance is probably higher performance than having to bother with LOD, > skirts, and all the rest. > > Best regards, > > David > > > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > -- Yann Le Paih Keraudrono 56150 BAUD Portable: +33(0)610524356 lepaih.y...@gmail.com
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