<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div style="font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; ">Dear OpenSim Devs,</div><div style="font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; "><br></div><div style="font-family: 'times new roman', 'new york', times, serif; font-size: 16px; color: rgb(0, 0, 0); background-color: transparent; font-style: normal; ">Date: 15 October 2012</div><div style="font-family: 'times new roman', 'new york', times, serif; font-size: 16px; color: rgb(0, 0, 0); background-color: transparent; font-style: normal; "><br></div><div style="font-family: 'times new roman', 'new york', times, serif; font-size: 16px; color: rgb(0, 0, 0); background-color: transparent; font-style: normal; ">PROPOSAL TO CHANGE <span style="background-color: transparent; ">PhysicalPrimMax=32</span><span
style="background-color: transparent; ">m</span></div><div style="font-family: 'times new roman', 'new york', times, serif; font-size: 16px; color: rgb(0, 0, 0); background-color: transparent; font-style: normal; ">This proposes a change to Regions.in file default parameter: <span style="background-color: transparent; ">PhysicalPrimMax=32</span><span style="background-color: transparent; ">m</span></div><div style="font-family: 'times new roman', 'new york', times, serif; font-size: 16px; color: rgb(0, 0, 0); background-color: transparent; font-style: normal; "><span style="background-color: transparent; ">Old parameter was: PhysicalPrimMax=10m<br></span></div><div style="font-family: 'times new roman', 'new york', times, serif; font-size: 16px; color: rgb(0, 0, 0); background-color: transparent; font-style: normal; "><span><font face="times new roman, new york, times, serif">This parameter defines the maximum prim size limit</font> (in any
dimension x,y or z) <span style="background-color: transparent; ">at which the prim may be recognized by the region as a physical object. If any dimension of the prim is larger than this limit, the prim fails to become physical.</span><br></span></div><div style="font-family: 'times new roman', 'new york', times, serif; font-size: 16px; color: rgb(0, 0, 0); background-color: transparent; font-style: normal; "><br></div><div style="font-family: 'times new roman', 'new york', times, serif; font-size: 16px; color: rgb(0, 0, 0); background-color: transparent; font-style: normal; ">DISCUSSION AT OPENSIM MEETING</div><div style="font-family: 'times new roman', 'new york', times, serif; font-size: 16px; color: rgb(0, 0, 0); background-color: transparent; font-style: normal; ">At the OpenSim Meeting last week in Wright Plaza OSGrid, I proposed changing the <span style="background-color: transparent; ">parameter default to </span><span
style="background-color: transparent; ">PhysicalPrimMax=</span><span style="background-color: transparent; ">64m.</span></div><div style="font-family: 'times new roman', 'new york', times, serif; font-size: 16px; color: rgb(0, 0, 0); background-color: transparent; font-style: normal; "><span style="background-color: transparent; ">However, </span><span style="background-color: transparent; ">after taking some data and doing some research testing various sizes and shapes of physical prims, </span><span style="background-color: transparent; ">I now propose </span>PhysicalPrimMax=<span style="background-color: transparent; ">32m instead. </span></div><div style="font-family: 'times new roman', 'new york', times, serif; font-size: 16px; color: rgb(0, 0, 0); background-color: transparent; font-style: normal; "><br></div><div style="background-color: transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new
york', times, serif; font-style: normal; "><font face="times new roman, new york, times, serif">BACKGROUND:</font></div><div style="background-color: transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; ">The maximum prim build size using v1 viewers in SL was 10m, but this became obsolete recently with v2 and v3 viewers going to 64m. There has been *no limit* on the size of a physical prim in SL using their Havok physics engine. A mega-prim in SL can be physical (I have successfully tested 1024x1024x1024 physical prims in SL). However, in OpenSim there is good reason to limit physical prim size, mainly due to the simulator physics load causing simulator FPS to slow down. </div><div style="background-color: transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; "><br></div><div style="background-color:
transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; ">WHY CHANGE?</div><div style="background-color: transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; "><span style="background-color: transparent; ">Q: Why would we want to change this default value? </span></div><div style="background-color: transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; "><span style="background-color: transparent; ">A: The primary motivation for changing this is the growing popularity of PHYSICAL VEHICLES in OpenSim. </span>Content creators for the OpenSim community must design their products for the most common default value limits.<br></div><div style="background-color: transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times
new roman', 'new york', times, serif; font-style: normal; "><br></div><div style="background-color: transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; ">WHAT TYPES OF VEHICLES REQUIRE 32m PRIM SIZE?</div><div style="background-color: transparent; "><font face="times new roman, new york, times, serif">Built to-scale vehicles require prim sizes larger than 10metres: boats, ships, trains, buses, airplanes, aircraft, spacecraft, automobiles, and amphibious craft. Especially multi-passenger vehicles and vehicles using tortured prims or mesh or sculpties. Tortured prims (path cut, dimpled, tapered) are often used to achieve the curve shapes of vehicles, and this leads to larger prim x,y, or z dimensions (even when the overall vehicle size is less than 10metres). Mesh vehicles tend to require larger prim size; an entire vehicle can be made with 1 mesh model.</font></div><div
style="background-color: transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; "><font face="times new roman, new york, times, serif"><br></font></div><div style="background-color: transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; "><font face="times new roman, new york, times, serif">BEST PARAMETER VALUE?</font></div><div style="background-color: transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; "><font face="times new roman, new york, times, serif">32 metres is the proposed best parameter value. It is a compromise based on performance vs the value of having creative content. Certainly 10m prims are safe performance, however, 10m severely limits the existence of vehicle content. </font></div><div
style="background-color: transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; "><span style="background-color: transparent; "><br></span></div><div style="background-color: transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; "><span style="background-color: transparent; ">TEST RESULTS</span></div><div style="background-color: transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; "><span style="background-color: transparent; ">In recent testing of free prims dropped to ground, it was found that there appears to be a "breaking point" in the physics FPS performance with physical prim size larger than 45 metres. When 64 metre torus shaped prims were tested, this brought the physics FPS down to a low level. But, when 32metre prim size
torus prims were tested, acceptably good performance was achieved. Of course, physics performance varies considerably among simulators. </span></div><div style="background-color: transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; "><span style="background-color: transparent; "><br></span></div><div style="background-color: transparent; "><div style="color: rgb(0, 0, 0); font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color: transparent; ">DATA:</div><div style="color: rgb(0, 0, 0); font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color: transparent; ">Please see collected data on size vs. shape on Physics FPS:</div><div style="color: rgb(0, 0, 0); font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color:
transparent; "><span style="background-color: transparent; "><a href="http://opensimulator.org/wiki/User:LaniGlobal#Proposed_Change_Regions_ini_Default_PhysicalPrimMax_10m_to_64m">http://opensimulator.org/wiki/User:LaniGlobal#Proposed_Change_Regions_ini_Default_PhysicalPrimMax_10m_to_64m</a></span></div><div style="color: rgb(0, 0, 0); font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color: transparent; "><br></div><div style="color: rgb(0, 0, 0); font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color: transparent; ">CONCLUSION:</div><div style="color: rgb(0, 0, 0); font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color: transparent; ">A proposal has been presented for a default change. The change would be from an obsolete, but "absolutely safe" default value, to a new value that is
closer to the center of compromise in simulator performance, only when larger size physical prims are rezzed by users. <span style="background-color: transparent; ">The result of this change would yield a huge increase in physical vehicle content in the OpenSim Community.</span><span style="background-color: transparent; "> </span></div><div style="color: rgb(0, 0, 0); font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color: transparent; "><span style="background-color: transparent; "><br></span></div><div style="color: rgb(0, 0, 0); font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color: transparent; "><span style="background-color: transparent; ">Respectfully submitted, </span></div><div style="color: rgb(0, 0, 0); font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color:
transparent; "><span style="background-color: transparent; ">Lani Global</span></div><div style="color: rgb(0, 0, 0); font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color: transparent; "><span style="background-color: transparent; ">(Amy Smith)</span></div><div style="color: rgb(0, 0, 0); font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color: transparent; "><span style="background-color: transparent; "><br></span></div><div style="color: rgb(0, 0, 0); font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color: transparent; "><span style="background-color: transparent; "><span style="background-color: transparent; ">Founder/</span>Content Creator, </span><span style="background-color: transparent; ">LANI GLOBAL SYSTEMS (tm)</span></div><div style="background-color: transparent;
"><span style="color: rgb(0, 0, 0); font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color: transparent; ">Owner of Lani region of OSGrid, </span><span style="background-color: transparent; font-family: 'times new roman', 'new york', times, serif; font-size: 16px; ">an OpenSim/HG 3-D Virtual Sci Fi World</span></div><div style="background-color: transparent; "><span style="background-color: transparent; "><font face="times new roman, new york, times, serif">http://twitter.com/LaniGlobal</font><br></span></div><div style="background-color: transparent; "><span style="background-color: transparent; "><font face="times new roman, new york, times, serif">hg.osgrid.org:80:lani<br></font></span></div><div style="background-color: transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; "><span style="color: rgb(0, 0, 0);
font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color: transparent; "><br></span></div><div style="background-color: transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; "><span style="color: rgb(0, 0, 0); font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color: transparent; "><br></span></div><div style="color: rgb(0, 0, 0); font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color: transparent; "><span style="background-color: transparent; "><br></span></div><div style="color: rgb(0, 0, 0); font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color: transparent; "><span style="background-color: transparent; "><br></span></div><div style="color: rgb(0, 0, 0);
font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color: transparent; "><span style="background-color: transparent; ">.</span></div><div style="color: rgb(0, 0, 0); font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color: transparent; "><br></div><div style="color: rgb(0, 0, 0); font-family: 'times new roman', 'new york', times, serif; font-size: 16px; font-style: normal; background-color: transparent; "><br></div></div><div style="background-color: transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; "><font face="times new roman, new york, times, serif"><br></font></div><div style="background-color: transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; "><font face="times new roman, new york,
times, serif"><br></font></div><div style="background-color: transparent; color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; "><font face="times new roman, new york, times, serif"><br></font></div></div></body></html>