[x3d-public] improvement efforts needed for X3D Example Archives: Basic, Rigid Body Physics

[John Carlson]

Also, https://www.xj3d.org/ seems to be a different site now, maybe a
blog?  Not the Xj3d browser site.

John

On Fri, Apr 10, 2026 at 10:35 AM Don Brutzman via x3d-public <
x3d-public at web3d.org> wrote:

> 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.
>
> 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.
>
> All contributed X3D models, and all efforts to re-establish common
> baseline examples for browsers to adopt, will be welcome.
>
>    - X3D Example Archives: Basic, Rigid Body Physics
>    - https://www.web3d.org/x3d/content/examples/Basic/RigidBodyPhysics/
>
> 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.
>
> These examples support the X3D Rigid Body Physics component
> <https://www.web3d.org/documents/specifications/19775-1/V4.0/Part01/components/rigid_physics.html> for
> simple kinematics, first implemented by Xj3D
> <http://www.xj3d.org/extensions/rigid_physics_examples.html>.
>
> *Warning:* the Rigid Body Physics component in not widely supported and
> these examples are insufficiently tested. Further work is welcome.
>
> Relevant specification sections:
>
>    - X3D Architecture, draft version 3.1, clause 37 Rigid body physics
>    component
>    <https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4.1-CD/Part01/components/rigidBodyPhysics.html>
>    -
>    https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4.1-CD/Part01/components/rigidBodyPhysics.html
>
> Personal slogan:  the hard part of Virtual Reality is... reality, which
> means physics.
>
> Thanks in advance for all efforts.
>
> all the best, Don
> --
> X3D Graphics, Maritime Robotics, Distributed Simulation
> Relative Motion Consulting  https://RelativeMotion.info
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