Real-Time Physics Simulation Forum

Re: How to get the velocity of rigid body

2020-07-28T14:56:01+00:00

speed = deltaDistance / deltaTime = meters /second

acceleration = deltaSpeed / deltaTime = meters / second^2

There is no RigidBody::getLinearAcceleration() method in the API.

There is a RigidBody::getGravity() method which would provide the free-fall acceleration sans collisions.

To measure the true effective acceleration of the object you must do it manually, which would require you to remember the lastTime and lastVelocity from the previous measurement. In pseudo code it might look something like:

Code:

thisTime = getTimeNow()thisVelocity = getLinearVelocity()deltaVelocity = thisVelocity - lastVelocitydeltaTime = thisTime - lastTimeacceleration = deltaVelocity / deltaTimelastTime = thisTimelastVelocity = thisVelocity

Statistics: Posted by drleviathan — Tue Jul 28, 2020 2:56 pm

Re: How to get the velocity of rigid body

2020-07-28T03:38:08+00:00

This seems to be the speed of each frame. What should I do if I want to get the speed per second? Thank you for your time

Statistics: Posted by water — Tue Jul 28, 2020 3:38 am

Re: How to get the velocity of rigid body

2020-07-13T14:25:53+00:00

Speed is the magnitude of velocity --> compute the length of the btVector3.

Statistics: Posted by drleviathan — Mon Jul 13, 2020 2:25 pm

Re: How to get the velocity of rigid body

2020-07-13T06:43:29+00:00

Thank you very much, but the return value I get is btVector3, how can I convert it to speed?

Statistics: Posted by water — Mon Jul 13, 2020 6:43 am

Re: How to get the velocity of rigid body

2020-07-09T03:15:04+00:00

btRigidBody::getLinearVelocity()

Statistics: Posted by drleviathan — Thu Jul 09, 2020 3:15 am

How to get the velocity of rigid body

2020-07-09T01:43:40+00:00

I want to get the velocity of a rigid body in motion. How can I get it? Thank you very much.

Statistics: Posted by water — Thu Jul 09, 2020 1:43 am