<div dir="ltr">Also, <a href="https://www.xj3d.org/">https://www.xj3d.org/</a> seems to be a different site now, maybe a blog? Not the Xj3d browser site.<div><br></div><div>John</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Fri, Apr 10, 2026 at 10:35 AM Don Brutzman via x3d-public <<a href="mailto:x3d-public@web3d.org">x3d-public@web3d.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>If someone wants to work on improving the following examples, that will be a welcome service to the community. Lack of common X3D models for testing means that we have little understanding regarding how well implemented X3D Rigid Body Physics might be.</div><div><br></div><div>Since several of the following models have old (circa X3D v3.2) experimental dependencies on the Xj3D codebase, the examples should likely be refactored, added to, or (in some cases) retired.</div><div><br></div><div>All contributed X3D models, and all efforts to re-establish common baseline examples for browsers to adopt, will be welcome.</div><div><ul><li>X3D Example Archives: Basic, Rigid Body Physics</li><li><a href="https://www.web3d.org/x3d/content/examples/Basic/RigidBodyPhysics/" target="_blank">https://www.web3d.org/x3d/content/examples/Basic/RigidBodyPhysics/</a></li></ul></div><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px"><div><div><p style="color:rgb(0,0,0);font-family:"Times New Roman"">Rigid Body Physics modeling deals with objects as solid, unchangeable sets of mass having a velocity that can be connected together via various joint types that allow one body's motion to affect another.</p></div></div></blockquote><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px"><div><p style="color:rgb(0,0,0);font-family:"Times New Roman"">These examples support the <a href="https://www.web3d.org/documents/specifications/19775-1/V4.0/Part01/components/rigid_physics.html" target="_blank">X3D Rigid Body Physics component</a> for simple kinematics, first implemented by <a href="http://www.xj3d.org/extensions/rigid_physics_examples.html" target="_blank">Xj3D</a>.</p></div></blockquote><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px"><div><p style="color:rgb(0,0,0);font-family:"Times New Roman""><i>Warning:</i> the Rigid Body Physics component in not widely supported and these examples are insufficiently tested. Further work is welcome.</p></div></blockquote><font color="#000000" face="arial, sans-serif">Relevant specification sections:</font><div><ul><li><font color="#000000" face="arial, sans-serif">X3D Architecture, draft version 3.1, clause 37 <a href="https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4.1-CD/Part01/components/rigidBodyPhysics.html" target="_blank">Rigid body physics component</a></font></li><li><font face="arial, sans-serif"><a href="https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4.1-CD/Part01/components/rigidBodyPhysics.html" target="_blank">https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4.1-CD/Part01/components/rigidBodyPhysics.html</a></font></li></ul><div><font face="arial, sans-serif">Personal slogan: the hard part of Virtual Reality is... reality, which means physics.</font></div><div><font face="arial, sans-serif"><br></font></div><div><font face="arial, sans-serif">Thanks in advance for all efforts.</font></div></div><div><font face="arial, sans-serif"><br></font></div><div><div><div dir="ltr" class="gmail_signature"><div dir="ltr"><div style="color:rgb(34,34,34)"><font face="monospace">all the best, Don</font></div><div style="color:rgb(34,34,34)"><font face="monospace">-- </font></div><div style="color:rgb(34,34,34)"><font face="monospace">X3D Graphics, Maritime Robotics, Distributed Simulation</font></div><div style="color:rgb(34,34,34)"><font face="monospace">Relative Motion Consulting <a href="https://RelativeMotion.info" target="_blank">https://RelativeMotion.info</a></font></div></div></div></div></div></div>
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