Real-Time Physics Simulation Forum

When I change the topology of the mesh(cutting, dissection), the new generated node should has new UV coordinate. Is there a good way to get or calculate the texture uv information from Bullet?

How to simulate large deformation in Bullet? Bullet uses shape matching algorithm to control the deformation of volumetric model. Just like this: pSoftBody->m_cfg.kMT=1; However, this can not handle the deformation of long bar. Artefacts are obvious when fix one side of the bar, and rotate the other...

In deformable object simulation, I want to set large damping for the collided vertices only. How can I do that?

How can I get the the time used for collision detection? I notice in the stepSimulation() function, there is a "startprofiling()". How can I retrieve the time used for collision detection?

When I use CCD on the kinematic object, it seems that tunneling still happen! Can kinematic object use CCD?

m_pBody->setCcdMotionThreshold(1e-7);
m_pBody->setCcdSweptSphereRadius(0.5);

The cylinder is represented as a btCylinderShape* attached to a btRigidBody with non-zero mass/inertia, right? Then you can move this cylinder in a similar way to mouse picking in the Bullet demo framework, using a picking constraint. Thanks for your advice. Now I have achieved this. I have another...

I have a haptic device. I want to use a cylinder primitive to represent haptic device. The cylinder primitive should keep pace with the haptic device and can collide with deformable object or rigid object. How can I implement this? The transformation matrix of haptic device is M. I set the motion st...

BVH and Spatial, which is more suitable for broad phase collision detection for deformable body? Considering self-collision, I think spatial hash is more suitable. Does spatial hash have any other advantages or disadvantages?

When I implement the collision detection and response proposed in "Position Based Dynamichttp://matthias-mueller-fischer.ch/publications/posBasedDyn.pdf". I found it only test vertex&triangle penetration for collision. No edge or face collision test. However, although high iteration nu...

when a triangle mesh (deformable body) collided with a static sphere, I can get the contact triangle and contact point and normal which lies inside the triangle. Then, how to bounce the triangle off the static sphere surface? The simplest solution is moving all the vertices along the contact normal....

Dirk Gregorius wrote:You simply skip over the constraint if the inequality is satisfied.

Then, if the inequality constraint is not satisfied, how to solve the constraint?

In position based dynamic, equality constraint such as distant constraint can be solved using constraint projection method. However, in paper related to PBD, how to solve inequality constraint are not mentioned a lot. How to solve the inequality constraint in the PBD framework ?

Hi, > 2. For equation (7)and (8), " To compute the moment matrix of a particle with orthonormal oritentation matrix R,........", How to calculate R ? Can someone explain it to me? This is about Generalized Shape Matching so one get R the same way as in Shape Matching by polar decompositio...

When I read this paper "Solid Simulation with Oriented Particle"(http://matthias-mueller-fischer.ch/publications/orientedParticles.pdf), I have some problems. I hope someone familiar with this paper can give me some help. 1. For equation 6, "We shift the center of mass of each Ai to t...

I think you've highlighted the main advantage of direct solving. One downside, however, is that it is not simple to directly solve certain types of constraints, in particular collision and friction with their limits. So you need an MLCP solver. If this has ever been combined with a sparse matrix so...