[Opensim-dev] PhysicalPrimMax numbers for BulletSim

[Teravus Ovares]

Not sure if you saw, however this is some good stuff.

http://opensimulator.org/mantis/view.php?id=6409

:)

Regards

Teravus

On Wed, Nov 7, 2012 at 4:35 PM, Adams, Robert <robert.adams at intel.com>wrote:

>  There has been an ongoing discussion on physical prim maximum size. Lani
> Global did some testing and published a graph of her results at
> http://opensimulator.org/wiki/User:LaniGlobal#PhysicalPrimMax_Size_Testing. Her testing showed that, for ODE, a max size of 32m resulted in a livable
> frame rate degradation.****
>
> ** **
>
> I performed the same tests with BulletSim and discovered that a single
> sphere (native physical shape) or a single torus (mesh/hull shape) did not
> reduce simulator frame rate no matter the size of the object.****
>
> ** **
>
> So, I created a single, standalone region with lumpy terrain and dropped
> different quantities of large shapes. The resulting frame rates were:****
>
> ** **
>
>              Number                                Number****
>
> SPHERE    1   4   8  16  32            TORUS[2] 1   4   8  32  64****
>
>        +--------------------                 +--------------------****
>
>     10 | 55  55  55  55  55               10 | 55  55  55  55  55****
>
> S  20 | 55  55  55  55  55             S 20 | 55  55  55  26  13****
>
> i  32 | 55  55  55  55  55             i 32 | 55  55  40  16****
>
> z  64 | 55  55  55  49  49             z 64 | 55  50  20****
>
> e  100| 55  54  49  47  [1]            e 100| 40  15****
>
> ** **
>
>   [1] My setup wasn’t large enough to hold 32 100m spheres.****
>
>   [2] The torus height is about one third of the width because I preferred
> the doughnut shape.****
>
> ** **
>
> A few pictures of the experiments (one region with walls):****
>
> https://dl.dropbox.com/u/86260377/20121107_009.png ****
>
> https://dl.dropbox.com/u/86260377/20121107_012.png ****
>
> https://dl.dropbox.com/u/86260377/20121107_017.png ****
>
> https://dl.dropbox.com/u/86260377/20121107_019.png ****
>
> https://dl.dropbox.com/u/86260377/20121107_022.png ****
>
> https://dl.dropbox.com/u/86260377/20121107_026.png ****
>
> ** **
>
> It looks like, for BulletSim, a physical object max size of 32m is
> acceptable and 64m would probably be OK. ****
>
> The physics frame rate is a function of the number and size of large,
> physical prims.  The above numbers are for multiple of the same object. The
> next tests should be on large sized linksets (for instance, two 5m cubes
> that are 32m apart and linked and physical).****
>
> ** **
>
> -- ra****
>
> ** **
>
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