[ODE] Proposal: Change Heightfield Origin

[Justin Couch]

Martijn Buijs wrote:

> Actually I've worked with USGS datasets before, and have never come across double precision data, I 
> assume they exist but are probably rare. But I agree we should a 'double' path, if only for the sake 
> of completeness.

Both DEM and DTED run in double precision. At a higher level, the VRML 
and X3D file formats only specify terrain in double precision. On the 
graphics side of things we end up doing a lot of local reprojections to 
try to keep rendering down to single precision that is implemented by 
the graphics card, but that's expensive calculations - particularly if 
you're doing it every frame as we would in a dynamic LOD'ed terrain 
environment.

-- 
Justin Couch                         http://www.vlc.com.au/~justin/
Java Architect & Bit Twiddler              http://www.yumetech.com/
3D Java Graphics Information                    http://www.j3d.org/
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