[osg-users] Update Optimization

Joachim E. Vollrath vollrath at vis.uni-stuttgart.de
Mon Jul 7 02:27:42 PDT 2008

Hello to all in this thread,

I have absolutely no terrain expertize and I don't know how OSG 
implements this, but just out of curiosity:

Suppose you have terrain elevation stored in an image (in CPU memory) as 
well as normals.

Given the 2d coordinate of an entity in elevation image space - wouldn't 
calculating the height and normal (resp. orientation) merely reduce to a 
bilinearly interpolated lookup in that image?

I may be wrong, but shouldn't it be possible to get interactive update 
rates that way?


John Burgess wrote:
> Hi all,
> My viewer needs to support at least 400 entities running at 30 Hz.. My entities are all moving tanks and I need to clamp them to the terrain using an update call back in every frame, the frame rate will drop to 3 Hz when I load 300 tanks with the update cycle taking up a huge amount of time. How can I achieve 30 Hz for 400 entities and yet be able to clamp them to the terrain?
> Thanks,
> John
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Dipl. Inf. Joachim E. Vollrath
Visualisierungsinstitut der Universitaet Stuttgart (VISUS)
web:   http://www.vis.uni-stuttgart.de/~vollrajm/
mail:  vollrath at vis.uni-stuttgart.de
phone: 49.711.7816.403
fax:   49.711.7816.213

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