CoppeliaSim forums

Hi, I will try to clarify the situation. For the friction model: The friction model allows setting the friction boundaries (FB). You can either specify FB yourself (box model) or you can use scaled box so that the FB=Fn*friction coefficient where Fn is the normal force. To make long story short, thi...

Hi Thomas, Solving a physics problem ends up solving mathematical equations. You can decide to be fast or accurate. In some situation, a lack of accuracy means less reliable results and may lead to instability. Vortex puts more emphasis to accuracy and hence is usually more stable and reliable. Martin

Hi, It is probably a good idea to answer this in the forum as this question gets asked a lot. The newest version of V-Rep is being shipped with the Vortex simulation engine and a trial license allowing 20 seconds of simulation with Vortex. This 20 seconds lets you verify the Vortex engine accuracy a...

Hi Qiushi, The constraints are like springs maintaining rigid bodies together. Those springs have stiffness that are not infinite. The default maximum stiffnesses for the constraint are provided in the Physics engine properties. The error you see is along Y, this is the gravity pushing on the object...

Hi Qiushi,

Sounds good.

ps: yes this is the same Martin you know! I told you I'd be around!

Good week-end

Martin

Hi Quishi, Simulating an tight fitting axle in a hollow cylinder using collision is a very difficult problem And I don't recommend trying to do this. The contact material is really hard and the error in position extremely critical. Simulating this would require a very small time step. Such simualtio...

Hi JK, Doing grasping using mesh collision is always difficult because estimation of penetration and contact generation can be very complex. Use of convex meshes usually leads to better results. For the comparison, ODE is certainly less stable than Bullet for my experience with convex meshes. The ne...