SOFA Benjamin

Benjamin replied to the topic Question about CollisionElementIterator in the forum Programming with SOFA 4 months, 1 week ago

Hi Alex,

Thanks a lot for your explanation. It is a bit confusing about the code. I was looking for the part that iterates the element inside the final bounding box. This is what I found. I actually tried to stop at this statement in the debug mode.
intersector->intersect(it1, it2, outputs); Then it will go to this statement
return…[Read more]
Benjamin started the topic Question about CollisionElementIterator in the forum Programming with SOFA 4 months, 2 weeks ago

Hi everyone,

I am trying to iterate the collision elements in the finalCollisionPairs in BVHNarrowPhase. The original code for iteration is:
for (auto it1 = begin1; it1 != end1; ++it1) { for (auto it2 = begin2; it2 != end2; ++it2) { // Final collision pair if (!selfCollision ||…[Read more]
Benjamin replied to the topic Question about calling header of SofaMeshCollision from SofaBaseCollision in the forum Programming with SOFA 6 months ago

Hi Alex,

Thank you so much for your response.

It seems the structure has been changed in version 20 compared to version 19. The calling used to work in the old version. That’s why it confused me.

I might test my algorithm by creating a component in SofaMeshCollision. Then create a new plugin if it works.

Best,
Sam
Benjamin started the topic Question about calling header of SofaMeshCollision from SofaBaseCollision in the forum Programming with SOFA 6 months ago

Hi there,

I am currently trying to modify the broadphase detection. In BruteBroadPhase.h file, I included TriangleModel.h from SofaMeshCollision. However, when I compiled it, the system said there was no such file or path. But surely, the header file is over there in SofaMeshCollision

I am using the version 20 on Linux system with ninja…[Read more]
Benjamin replied to the topic Question about variable meaning in collision component in the forum Programming with SOFA 11 months, 3 weeks ago

Hi Hugo,

Very appreciate your help. It solves my problem.

Regards,
Ben
Benjamin replied to the topic Question about variable meaning in collision component in the forum Programming with SOFA 1 year ago

Hi hugo,

Sorry for the late update. I have tried your method, but it seems if I need to use the old position in the collision detection, calling the position from solver is hard to make for me. From what I found, the solver updated every time before the collision detection is triggered.

So I am trying to add additional function in…[Read more]
Benjamin started the topic Adding Constraint in Python Controller in the forum Programming with SOFA 1 year, 1 month ago

Hi Hugo,

Can I ask if I can achieve the performance of PartialFixedConstraint in Python Controller? I understand this is based on projectve constraint and set the velocity to zero. So for example, I tried to keep velocity on x, y to zero and only allow motion on z direction in both onBeginAnimationStep and onEndAnimationStep. But it seems these…[Read more]
Benjamin replied to the topic Question about variable meaning in collision component in the forum Programming with SOFA 1 year, 2 months ago

Hi Hugo,

Sorry for late reply and thanks for the explanation.

I have sort of figuring out the usage of CollisionElemenIterator. But there is another problem appears. My collision algorithm requires to compare the node positions in previous frame and current frame. Does SOFA store all nodes’ old positions? From what I have seen in Intersection…[Read more]
Benjamin replied to the topic Mapping issue between 2 meshes in the forum Using SOFA 1 year, 2 months ago

Hi @twxu,

I also have the same problem as you. Can I ask if it is possible to tell me how to align the mesh from two different object?

Regards,
Ben
Benjamin started the topic Question about variable meaning in collision component in the forum Programming with SOFA 1 year, 3 months ago

Hi everyone,

Can anyone help me with the meaning of variable CollisionElement and CollisionModel? From what I am understanding, the CollisionElement refers to the unit like point, edge, triangle and CollisionModel refers to bounding volume? The explanation either in the documentation or code comments is vague. Can anyone give me more details…[Read more]
Benjamin replied to the topic Continuous collision detection in the forum Programming with SOFA 1 year, 3 months ago

Hi Francois,

Thanks for your reply.

What I am thinking is to replace the detection algorithm in SOFA with my algorithm. The part of code in SOFA I’d like to replace is the addCollisionPair in BruteForceDection.cpp. So the same outputs as the old code (contact time, contact point, etc.) will be given by the new algorithms and the SOFA will use…[Read more]
Benjamin replied to the topic Continuous collision detection in the forum Programming with SOFA 1 year, 3 months ago

Hi Hugo,

I am also currently working on Continuous Collision Detection. Do you know if anyone is familiar with this part? Do you have suggestions how to build the unit test to test the collision part in SOFA?

Regards,
Ben
Benjamin started the topic Question about pre-deformed bellow actuator in the forum Using SOFA 1 year, 6 months ago
Hi everyone,

I have a question about loading pre-deformed geometry, similar to the an old post
. I want the initial state of a hollow bellow actuator in a compression condition and then running other simulation based on this initial state. One end of actuator will…[Read more]
Benjamin became a registered member 1 year, 6 months ago

Benjamin

@wzdy4444

View Profile

Benjamin

@wzdy4444