Real-Time Physics Simulation Forum

marios

Yep, You can do that easily just add this line while creating your body. Then it will not collide but it will be still generating contact points, that you want to use to check which body is inside water. body->setCollisionFlags(body->getCollisionFlags()| btCollisionObject::CF_NO_CONTACT_RESPONSE));

marios

Ok i managed to do that. Constraint limit in world coordinates is : constraint->getLinearLowerLimit(lowLimit); lowLimit=lowLimit - constraint->getFrameOffsetB().getOrigin() + constraint->getFrameOffsetA().getOrigin(); //low limit is now in world coordinates note tat there is no rotations, with rotat...

marios

I am playing with btGeneric6DofSpringConstraint and during simulation I like to know linear constraint limits in world coordinates (first body is fixed). I was trying to achieve that by doing calculations with frameA, frameB, calculatedTransformA and calculatedTransformA but without good result. I n...

marios

My prototype game uses Bullet Physics. It has no name jet, it is still in development stage. My last created video that shows physics based sound: http://vimeo.com/28902192 implemented interesting bullet connected, physics things: real-time destruction physical sound forcefields networking physics (...

marios

Before you remove/delete rigidbody from world,you should remove all constraints connected with this body, for example like this: int num=body->getNumConstraintRefs(); //body of course is body you want to delete for(int j=0;j<num;++j) dynamicsWorld->removeConstraint(body->getConstraintRef(0)); dynami...

marios

hmm, so maybe operate directly on body->getWorldTransform() instead motionstate

marios

I'm doing this like that:

Code: Select all

void dynamics_box::rotate(const float3 Angles)
{
btTransform Transformation;
motion_state->getWorldTransform(Transformation);

Transformation.getBasis().setEulerYPR(Angles.y,Angles.x, Angles.z);

motion_state->setWorldTransform(Transformation);
}

marios

how do you move your player? impulses or kinematic object? If impulses/forces I suggest you to add some force upward. Another way to workaround this is to change player collision object to sphere or capsule

marios

Glad it worked. m_splitImpulse when enabled removes effect of instant separation of overlapping objects, instead that, we get smooth, slow and not excessive separation

marios

Try, if this helps:

Code: Select all

dynamicsWorld->getSolverInfo().m_splitImpulse = true;

marios

look at this thread http://www.bulletphysics.org/Bullet/php ... f=9&t=6832

marios

just store somewhere pointer to that constraint you want to delete, and than between brackets: dynamicsWorld->removeConstraint(constraint_ptr); or better, you can use FirstRigidBody->getConstraintRef(index) but you must know constraint index (if you have only one constraint connected to FirstRigidBo...

marios

Quaternions are weird:) have you tried using matrices instead of quaternions? I think it's simpler. Code like this:

Code: Select all

float y,p,r;
transform.getBasis().getEulerYPR(y,p,r);
transform.getBasis().setEulerYPR(y+0.002f,p,r); //add some angle to axis you want

marios

first idea that comes into my mind, is to set each frame limit(for example low limit) using setLimit(...) method with actual angle of constraint that you can get by getHingeAngle() . You can try doing that, but i don't guarantee that works corectly. edit: instead of setting new limit each frame, you...

marios

what are you exactly displaying by cout<<... ? It looks like integer value and bullet is working in floats, are you casting it?

Real-Time Physics Simulation Forum

Search found 52 matches

Re: Mesh as collision detector but not physical object

Re: linear limits in world coordinates

linear limits in world coordinates

platform game

Re: crash at exit

Re: Changing an object's rotation

Re: Changing an object's rotation

Re: Object stuck in the floor.

Re: Body shouldn't bounce

Re: Body shouldn't bounce

Re: Requirement on joints

Re: remove a constraint for certain condition

Re: btKinematicCharacterController and strafing

Re: constraining rotation in one direction

Re: stepSimulation seems to be slacking