Search found 72 matches
- Fri Jan 08, 2016 12:48 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: Getting world coordinates of vertices of a convex hull body
- Replies: 3
- Views: 6227
Re: Getting world coordinates of vertices of a convex hull b
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...
- Thu Jan 07, 2016 2:44 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: Getting world coordinates of vertices of a convex hull body
- Replies: 3
- Views: 6227
Getting world coordinates of vertices of a convex hull body
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
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
- Fri Nov 13, 2015 1:45 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: Internal force in a softbody
- Replies: 4
- Views: 4575
Re: Internal force in a softbody
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...
- Fri Oct 23, 2015 1:01 pm
- Forum: Research and development discussion about Collision Detection and Physics Simulation
- Topic: STL importer for softbodies
- Replies: 0
- Views: 5562
STL importer for softbodies
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 ...
- Mon Oct 05, 2015 1:16 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: Internal force in a softbody
- Replies: 4
- Views: 4575
Re: Internal force in a softbody
still wondering ...
- Wed Sep 30, 2015 8:29 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Manual recovery from penetration problem
- Replies: 5
- Views: 6113
Re: Manual recovery from penetration problem
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.
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.
- Wed Sep 30, 2015 8:25 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Internal force in a softbody
- Replies: 4
- Views: 4575
Re: Internal force in a softbody
Or where the principles and formulas of the softbody can be found?
For instance, how the bending constrains work, etc.
For instance, how the bending constrains work, etc.
- Mon Sep 28, 2015 9:56 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Internal force in a softbody
- Replies: 4
- Views: 4575
Internal force in a softbody
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...
- Thu Sep 24, 2015 2:06 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: [SoftBody+SoftBody] Collisions [HELP!]
- Replies: 1
- Views: 2703
Re: [SoftBody+SoftBody] Collisions [HELP!]
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
once you have set the settings as noted in "SoftDemo"
just add
Code: Select all
softBody->m_cfg.collisions |= btSoftBody::fCollision::VF_SS;
There is no need to register new collision algorithm.
Ehsan
- Thu Sep 24, 2015 9:02 am
- Forum: General Bullet Physics Support and Feedback
- Topic: member variable of some classes
- Replies: 5
- Views: 6853
Re: member variable of some classes
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.
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.
- Mon Sep 21, 2015 12:39 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: [SoftBody+SoftBody] Collisions [HELP!]
- Replies: 1
- Views: 2703
[SoftBody+SoftBody] Collisions [HELP!]
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...
- Mon Jul 27, 2015 10:20 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Why my bullet simulation is not going on GPU?
- Replies: 3
- Views: 3894
Re: Why my bullet simulation is not going on GPU?
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...
- Thu Jul 09, 2015 1:47 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: How can I increase the physical realism of my simulation?
- Replies: 11
- Views: 10909
Re: How can I increase the physical realism of my simulation
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...
- Thu Jul 09, 2015 10:06 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Why my bullet simulation is not going on GPU?
- Replies: 3
- Views: 3894
- Thu Jul 09, 2015 8:35 am
- Forum: General Bullet Physics Support and Feedback
- Topic: How can I increase the physical realism of my simulation?
- Replies: 11
- Views: 10909
Re: How can I increase the physical realism of my simulation
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.
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.