How can I get the impact velocity?-CodePudding

OnCollisionEnter I am calculating the magnitude to determine whether or not to play a sound clip. Which works fine for most of the collisions, but it is triggering with my ball that is rolling on a plane. Since the ball is moving at a relatively fast speed and the magnitude doesn't take direction into account, every time it rolls it plays the clip. Sometimes 15 times a second. I only want the clip to play when the ball is dropped on the plane. Does anybody have some suggestions or solutions to calculate the impact velocity?

CodePudding user response：

Consider trying to check if the object's velocity is in your threshold, you could narrow down the collisions checked via using object tags.

More info about rigidbody velocity.

*edit: spelling

CodePudding user response：

You can calculate the impact angle between the surface normal and the relative impact velocity and take it into account.

void OnCollisionEnter(Collision collision)
{
  Vector3 velocity = collision.relativeVelocity;
  Vector3 normal = collision.GetContac(0).normal;
  if (velocity.magnitude > 2)//impact faster than 2
  {
    if (Vector3.Angle(normal, velocity) > 60)//impact angle greater than 60
    {
      audioSource.Play();
    }
  }
}