<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>To accompany the other attempts at porting the Bullet physics engine into OpenSimulator, BulletSim has been merged into the master OpenSimulator branch.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>It is nowhere near ready to replace ODE but it has basic physical object functionality, good performance and no crashes. Some of the current features:<o:p></o:p></p><p class=MsoNormal> The latest version of Bullet (2.78)<o:p></o:p></p><p class=MsoNormal> Use of Bullet native shapes for cubes and spheres (with any scaling)<o:p></o:p></p><p class=MsoNormal> Triangle meshes for static objects and automatically generated convex hulls for physical objects<o:p></o:p></p><p class=MsoNormal style='text-indent:.5in'>Collision events for objects and terrain<o:p></o:p></p><p class=MsoNormal> Initial code for linksets (but debugging is needed)<o:p></o:p></p><p class=MsoNormal> Initial code for vehicles (but vehicles don’t work yet)<o:p></o:p></p><p class=MsoNormal> Gettable and settable parameters (‘physics’ console command)<o:p></o:p></p><p class=MsoNormal style='text-indent:.5in'>Efficient interface between the C# and C++ code<o:p></o:p></p><p class=MsoNormal style='text-indent:.5in'><o:p> </o:p></p><p class=MsoNormal>BulletSim is enabled by setting “physics = BulletSim” in OpenSim.ini. There are dll’s for 32 and 64 bit Windows and so’s for 32 and 64 bit Linux. (For 64 bit Windows, you need to copy “BulletSim-x86_64.dll” onto “BulletSim.dll”).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>BulletSim consists of two parts: the C# module (which interfaces between OpenSimulator and the C++ code) and C++ code (which makes the calls to a statically linked Bullet physics engine). The C++ code is in the ‘opensim-libs’ repository (“http://opensimulator.org/svn/opensim-libs/trunk/unmanaged/BulletSim/”) and the C# code is now in the OpenSimulator git ‘master’ branch (OpenSim/Region/Physics/BulletSPlugin/).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>There is a lot of tuning and adaptation that needs to happen yet and anyone who wants to help feel free to jump in. I (radams1) am often on the IRC channels so let’s talk.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>-- ra<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>