Search found 72 matches
- Wed Jan 06, 2021 1:52 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: point to point spring constraint possible?
- Replies: 6
- Views: 11003
Re: point to point spring constraint possible?
Hi, does btGeneric6DofSpringConstraint support point to point spring constraint when two dynamic objects are moving with respect to each other? I see that for btGeneric6DofSpringConstraint, spring and damping coefficients can be defined only in 3 directions, which means, if the location of two conne...
- Wed Jan 06, 2021 1:47 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: Spring between two dynamic objects
- Replies: 2
- Views: 4879
Re: Spring between two dynamic objects
Hi there, I am exactly looking for the same thing. I did not find a point to point spring feature, however, a workaround might be to dynamically adjust the stiffness and damping of the point to point object at each time step when the orientation of the two dynamic bodies are altered. BTW if you foun...
- Wed Feb 15, 2017 7:09 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: Serialization of Softbodies
- Replies: 1
- Views: 9870
Serialization of Softbodies
Hi,
In the code it is mentioned that for the serialization of softbodies, refer to the derialzation demo, however, I cannot find such demo anymore,
Can some body give some hints for serialization of softbofies and how to import it into the world and how to access to the nodes and links?
Thanks
Ehsan
In the code it is mentioned that for the serialization of softbodies, refer to the derialzation demo, however, I cannot find such demo anymore,
Can some body give some hints for serialization of softbofies and how to import it into the world and how to access to the nodes and links?
Thanks
Ehsan
- Wed Jan 18, 2017 1:15 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: define local coordinates for btGeneric6DofSpring2Constraint
- Replies: 1
- Views: 4655
define local coordinates for btGeneric6DofSpring2Constraint
Hi, I want to define a spring between two rigid bodies (one static and one dynamic). However, I want the axis of the spring to be rotated along the line connecting both rigid bodies. In this way, the spring stiffness will remain valid regardless of the rotation of the dynamic rigid body. Does anyone...
- Tue Nov 15, 2016 1:57 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: deformation diffusion in softbody
- Replies: 1
- Views: 3979
Re: deformation diffusion in softbody
Take a look at this for more clarification:
https://youtu.be/79WKvHVGRMw
https://youtu.be/79WKvHVGRMw
- Tue Nov 15, 2016 1:48 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: deformation diffusion in softbody
- Replies: 1
- Views: 3979
deformation diffusion in softbody
Hi, If you model a cloth or a rope, and clip one end, and apply a force at the end of that, in order to stretch it (for simplicity under zero gravity), you will notice that the elongation of the nodes around the clipped nodes are higher than the elongation of the nodes around the area on which the f...
- Wed Sep 21, 2016 1:43 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: SoftBody behaviour with time increment and iteration number
- Replies: 3
- Views: 8531
Re: SoftBody behaviour with time increment and iteration num
See here: https://www.youtube.com/watch?v=rm26NF9f4aA
and this paper which solves the problem: http://mmacklin.com/xpbd.pdf
and this paper which solves the problem: http://mmacklin.com/xpbd.pdf
- Thu Aug 18, 2016 9:41 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: SoftBody behaviour with time increment and iteration number
- Replies: 3
- Views: 8531
Re: SoftBody behaviour with time increment and iteration num
With such annoying things of softbodies, perhaps it is best to use FEM for modelling of deformable bodies for engineering usages.
However, it is not yet implemented in Bullet...
However, it is not yet implemented in Bullet...
- Wed Aug 17, 2016 8:38 am
- Forum: General Bullet Physics Support and Feedback
- Topic: SoftBody behaviour with time increment and iteration number
- Replies: 3
- Views: 8531
SoftBody behaviour with time increment and iteration number
Hi all, I'm simulating a rope (softbody) as an spring in an engineering project. However, I found out that soft body (not even ropes, but patches) behave strangely with time step and iteration! Ok, I understand that the behaviour should change when iteration number is changed, but it must converge t...
- Wed Mar 16, 2016 11:33 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Get vertex of btGImpactMeshShape
- Replies: 2
- Views: 9479
Re: Get vertex of btGImpactMeshShape
Is it something related to locking or unlocking the mesh?
Any hints?
Any hints?
- Wed Mar 09, 2016 3:22 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: Get vertex of btGImpactMeshShape
- Replies: 2
- Views: 9479
Get vertex of btGImpactMeshShape
Hi,
How can I get vertices of a gimpact shape?
I do:
btVector3 localPos;
collisionShape->getMeshPart(0)->getVertex(j,localPos);
it compiles well, but when it executes, it gives a segmentation fault!
Am I missing something?
Regards,
Ehsan
How can I get vertices of a gimpact shape?
I do:
btVector3 localPos;
collisionShape->getMeshPart(0)->getVertex(j,localPos);
it compiles well, but when it executes, it gives a segmentation fault!
Am I missing something?
Regards,
Ehsan
- Mon Feb 29, 2016 8:51 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Linking order of soft body and bullet world importer
- Replies: 2
- Views: 5796
Re: Linking order of soft body and bullet world importer
Sorry
It was my mistake!
there is no "lib" folder in bullet 3 any more.
It was my mistake!
there is no "lib" folder in bullet 3 any more.
- Mon Feb 15, 2016 11:26 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Linking order of soft body and bullet world importer
- Replies: 2
- Views: 5796
Re: Linking order of soft body and bullet world importer
Now i figure out that for exporting and importing of softRigidDynamicsWorld s I get always the above error!
It is strange. In the bullet serialization wiki page, it is noted that serialization supports softbodies, but it seems doesn't.
Any hint?
It is strange. In the bullet serialization wiki page, it is noted that serialization supports softbodies, but it seems doesn't.
Any hint?
- Mon Feb 15, 2016 10:43 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Linking order of soft body and bullet world importer
- Replies: 2
- Views: 5796
Linking order of soft body and bullet world importer
Hi, I have a discrete dynamics world and I exported that in a "saveWorld.bullet" file. It includes hundreds of rigid bodies. Then I want to import this world and add some soft bodies to the world to interact with the rigid bodies in the imported rigid bodies. However, I cannot figure out h...
- Fri Jan 08, 2016 1:59 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: Questions about Constraints and Compounds
- Replies: 1
- Views: 3698
Re: Questions about Constraints and Compounds
Hi, 1) The jittering behaviour might be due to one of the following reasons: a) the size of the shards are extremely large or extremely small. With extremely small shards, you get an explosive behaviour and with extremely large ones, you may observe jittering. b) the time step you've chosen is relat...