Skip to main content
Game Development

Return to Answer

edited body
Source Link
Vikram Saran
Vikram Saran
  • 126
  • 4

You're mistaking restitution. Or more specifically, it depends upon Bullet's chosen restitution implementation.

Ideally you would be able to define [ball, plane].restitution as 0.9 and [box, plane].restitution as 0.1, for example.

The total coefficient of restitution, in real life, is almost always >0.0 and <1.0.

Thus, when generating your restitution from two separate object materials, depending on the method*, ensure that your coefficients are between 0.0 and 0.5.

*The example above assumes that the two materials' restitutions are added together. I am not sure about whether Bullet adds them together, multiplies them or performs some form of min/max.

Further investigation:

  1. Looking at bullet's constraint solver you can see that it gets the contact manifold
  2. Once it has the manifold it gets a specific contact point
  3. Once it has the contact point it requests its "m_combinedRestitution"

However, I do not have the time right now to download the source and investigate where the m_combinedRestitution is set. If you were to investigate, I'd look into the NarrowPhaseCollision section of bulletNarrowPhaseCollision section of Bullet.

You're mistaking restitution. Or more specifically, it depends upon Bullet's chosen restitution implementation.

Ideally you would be able to define [ball, plane].restitution as 0.9 and [box, plane].restitution as 0.1, for example.

The total coefficient of restitution, in real life, is almost always >0.0 and <1.0.

Thus, when generating your restitution from two separate object materials, depending on the method*, ensure that your coefficients are between 0.0 and 0.5.

*The example above assumes that the two materials' restitutions are added together. I am not sure about whether Bullet adds them together, multiplies them or performs some form of min/max.

Further investigation:

  1. Looking at bullet's constraint solver you can see that it gets the contact manifold
  2. Once it has the manifold it gets a specific contact point
  3. Once it has the contact point it requests its "m_combinedRestitution"

However, I do not have the time right now to download the source and investigate where the m_combinedRestitution is set. If you were to investigate, I'd look into the NarrowPhaseCollision section of bullet.

You're mistaking restitution. Or more specifically, it depends upon Bullet's chosen restitution implementation.

Ideally you would be able to define [ball, plane].restitution as 0.9 and [box, plane].restitution as 0.1, for example.

The total coefficient of restitution, in real life, is almost always >0.0 and <1.0.

Thus, when generating your restitution from two separate object materials, depending on the method*, ensure that your coefficients are between 0.0 and 0.5.

*The example above assumes that the two materials' restitutions are added together. I am not sure about whether Bullet adds them together, multiplies them or performs some form of min/max.

Further investigation:

  1. Looking at bullet's constraint solver you can see that it gets the contact manifold
  2. Once it has the manifold it gets a specific contact point
  3. Once it has the contact point it requests its "m_combinedRestitution"

However, I do not have the time right now to download the source and investigate where the m_combinedRestitution is set. If you were to investigate, I'd look into the NarrowPhaseCollision section of Bullet.

Source Link
Vikram Saran
Vikram Saran
  • 126
  • 4

You're mistaking restitution. Or more specifically, it depends upon Bullet's chosen restitution implementation.

Ideally you would be able to define [ball, plane].restitution as 0.9 and [box, plane].restitution as 0.1, for example.

The total coefficient of restitution, in real life, is almost always >0.0 and <1.0.

Thus, when generating your restitution from two separate object materials, depending on the method*, ensure that your coefficients are between 0.0 and 0.5.

*The example above assumes that the two materials' restitutions are added together. I am not sure about whether Bullet adds them together, multiplies them or performs some form of min/max.

Further investigation:

  1. Looking at bullet's constraint solver you can see that it gets the contact manifold
  2. Once it has the manifold it gets a specific contact point
  3. Once it has the contact point it requests its "m_combinedRestitution"

However, I do not have the time right now to download the source and investigate where the m_combinedRestitution is set. If you were to investigate, I'd look into the NarrowPhaseCollision section of bullet.