<div>Not sure if you saw, however this is some good stuff.</div><div> </div><div><a href="http://opensimulator.org/mantis/view.php?id=6409">http://opensimulator.org/mantis/view.php?id=6409</a> </div><div> </div><div>:)</div>
<div> </div><div>Regards</div><div> </div><div>Teravus<br><br></div><div class="gmail_quote">On Wed, Nov 7, 2012 at 4:35 PM, Adams, Robert <span dir="ltr"><<a href="mailto:robert.adams@intel.com" target="_blank">robert.adams@intel.com</a>></span> wrote:<br>
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<p class="MsoNormal">There has been an ongoing discussion on physical prim maximum size. Lani Global did some testing and published a graph of her results at
<a href="http://opensimulator.org/wiki/User:LaniGlobal#PhysicalPrimMax_Size_Testing" target="_blank">
http://opensimulator.org/wiki/User:LaniGlobal#PhysicalPrimMax_Size_Testing</a> . Her testing showed that, for ODE, a max size of 32m resulted in a livable frame rate degradation.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">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.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">So, I created a single, standalone region with lumpy terrain and dropped different quantities of large shapes. The resulting frame rates were:<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Number Number<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">SPHERE 1 4 8 16 32 TORUS[2] 1 4 8 32 64<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> +-------------------- +--------------------<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> 10 | 55 55 55 55 55 10 | 55 55 55 55 55<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">S 20 | 55 55 55 55 55 S 20 | 55 55 55 26 13<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">i 32 | 55 55 55 55 55 i 32 | 55 55 40 16<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">z 64 | 55 55 55 49 49 z 64 | 55 50 20<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">e 100| 55 54 49 47 [1] e 100| 40 15<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><u></u> <u></u></span></p>
<p class="MsoNormal"> [1] My setup wasn’t large enough to hold 32 100m spheres.<u></u><u></u></p>
<p class="MsoNormal"> [2] The torus height is about one third of the width because I preferred the doughnut shape.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">A few pictures of the experiments (one region with walls):<u></u><u></u></p>
<p class="MsoNormal"><a href="https://dl.dropbox.com/u/86260377/20121107_009.png" target="_blank">https://dl.dropbox.com/u/86260377/20121107_009.png</a>
<u></u><u></u></p>
<p class="MsoNormal"><a href="https://dl.dropbox.com/u/86260377/20121107_012.png" target="_blank">https://dl.dropbox.com/u/86260377/20121107_012.png</a>
<u></u><u></u></p>
<p class="MsoNormal"><a href="https://dl.dropbox.com/u/86260377/20121107_017.png" target="_blank">https://dl.dropbox.com/u/86260377/20121107_017.png</a>
<u></u><u></u></p>
<p class="MsoNormal"><a href="https://dl.dropbox.com/u/86260377/20121107_019.png" target="_blank">https://dl.dropbox.com/u/86260377/20121107_019.png</a>
<u></u><u></u></p>
<p class="MsoNormal"><a href="https://dl.dropbox.com/u/86260377/20121107_022.png" target="_blank">https://dl.dropbox.com/u/86260377/20121107_022.png</a>
<u></u><u></u></p>
<p class="MsoNormal"><a href="https://dl.dropbox.com/u/86260377/20121107_026.png" target="_blank">https://dl.dropbox.com/u/86260377/20121107_026.png</a>
<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">It looks like, for BulletSim, a physical object max size of 32m is acceptable and 64m would probably be OK.
<u></u><u></u></p>
<p class="MsoNormal">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).<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">-- ra<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
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