Real-Time Physics Simulation Forum

Should be something like "centerOfMassTransform * point " for each point i. point is the location of the vertex relative to the center of mass of the object, and centerOfMassTransform is a quaternion representing the translation and rotation of the object at some point in time. Multiplyin...

Hi,

Does anyone know how to get coordinates of every vertices of a convexHull object?

I have a convex hull object in my scene, and I want to get the coordinates of its all vertices (x,y,z) in every time step.

Thanks
Ehsan

I did not find any parameter regarding the internal force within softbody.cpp file. What is very strange to me is that why the amount of mass of soft body affect the behaviour of it and makes it stiffer?! In all of the formulations of the spring-mass systems (particle based systems for deformable ob...

Hi, For a project I had to import a softbody from stl, I used the "loadFromMeshSTL.h" (in ../examples/Importers/ImportSTLDemo/), however I found that it only works for rigid bodies. Actually it gets each face and transfers the 3 vertexes individually to the vertices array. As a result, if ...

still wondering ...

I think two parameters may affect this behaviour:

1) reducing the time increment
2) increasing the number of iterations of the solver (by default it is set to 20)

Let me know if this work or not.

Or where the principles and formulas of the softbody can be found?

For instance, how the bending constrains work, etc.

Dear All, Does anyone know how to get the forces between to adjacent nodes in a softbody? I know that there is a linear stiffness in the softbody that acts as a spring stiffness, but multiplication of "change length" to that stiffness wont result in the internal forces. It seems that parti...

I found it:
once you have set the settings as noted in "SoftDemo"
just add before adding the softbody to the world.

There is no need to register new collision algorithm.

Ehsan

I found a good reference for learning the physics of the softbodies.

In the chapter 8 (Particle systems) of the book "Physics-based animations" written by: Erleben/Sporring/Henriksen and Dohlmann, you cand find very useful info.

Hallo, Does anybody know how to set the collisionConfigurations in order to have all three: SoftBody + SoftBody collisions and RigidBody + RigidBody collisions and RigidBody + RigidBody collisions simultaneously? I took a look at the SoftDemo example code, Now I can set SoftBody + RigidBody collisio...

I'm still trying to figure out this, if somebody knows, I will be glad to hear hints. One thing is that when I run ./App_AllBu... and run "nvidia-smi" on another terminal, the usage of gpu is clear. But in my specific code (which takes long time to run, but I dont have any visualisation in...

Although there is a slight difference in our methods, in your simulation, the system is highly dynamic and you get errors in positions, but in my case, the position is correct, however, the system is not that much dynamic (the rigid bodies are moving calmly), but the error in my simulation emerges i...

Any help??

Yes, I also posted here : http://www.bulletphysics.org/Bullet/php ... =9&t=10694

about the problem. when the time step decreases, the accuracy becomes better, but lower amounts beyond 0.001s, makes worse accuracy.
I am not sure if it is an issue or not.