[ODE] Huge world vs precision problems

[Bram Stolk]

Anders Olofsson wrote:
> Hello all!.
> 
> I have a huge world, around 2500*2500 km, and have obviously encounter 
> precision problems. I think I've solved the triangle collision problems I 
> described before but I stumbled on yet another, geomtransforms! (Or I guess 
> positioning in general).
> 
> I have an object made of several geoms and if I place it at origin (0,0,0) 
> of my world it works great but at the outer edges of the world the same 
> object geoms positions starts to wobble/jitter. I'm working with floats 
> haven't tried doubles yet, I'm not particulary familiar with the 
> floatingpoints types precision limits.
> 
> What are my options?, I thought of partitioning up my world in smaller 
> chunks that floats can handle. But in practice I haven't figured out how to 
> do that, is it possible somehow? How small/large would those chunks be?. 
> (Or at around what huge number start floats to loose their precision? :) )
> 
> Some other more "quick fix"?

quickest fix:

./configure --with-double-precision

  Bram

> 
> Thanks!
> 
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-- 
Bram Stolk, VR Engineer SARA, Amsterdam.   tel +31 20 592 3000

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