public bool AddConstraint(BSConstraint cons)
{
lock (m_constraints)
{
// There is only one constraint between any bodies. Remove any old just to make sure.
RemoveAndDestroyConstraint(cons.Body1, cons.Body2);
m_constraints.Add(cons);
}
return true;
}
// Get the constraint between two bodies. There can be only one.
// Return 'true' if a constraint was found.
public bool TryGetConstraint(BulletBody body1, BulletBody body2, out BSConstraint returnConstraint)
{
bool found = false;
BSConstraint foundConstraint = null;
uint lookingID1 = body1.ID;
uint lookingID2 = body2.ID;
lock (m_constraints)
{
foreach (BSConstraint constrain in m_constraints)
{
if ((constrain.Body1.ID == lookingID1 && constrain.Body2.ID == lookingID2)
|| (constrain.Body1.ID == lookingID2 && constrain.Body2.ID == lookingID1))
{
foundConstraint = constrain;
found = true;
break;
}
}
}
returnConstraint = foundConstraint;
return found;
}
// The constraint MUST exist in the collection
// Could be called if the constraint was previously removed.
// Return 'true' if the constraint was actually removed and disposed.
public bool RemoveAndDestroyConstraint(BSConstraint constrain)
{
bool removed = false;
lock (m_constraints)
{
// remove the constraint from our collection
removed = m_constraints.Remove(constrain);
}
// Dispose() is safe to call multiple times
constrain.Dispose();
return removed;
}
public virtual void SetLinkParameters(BSConstraint constrain) { }
public BSActorLockAxis (BSScene physicsScene, BSPhysObject pObj, string actorName)
: base (physicsScene, pObj, actorName)
{
m_physicsScene.DetailLog ("{0},BSActorLockAxis,constructor", m_controllingPrim.LocalID);
LockAxisConstraint = null;
}
void RemoveAxisLockConstraint ()
{
UnRegisterForBeforeStepCallback ();
if (LockAxisConstraint != null)
{
m_physicsScene.Constraints.RemoveAndDestroyConstraint (LockAxisConstraint);
LockAxisConstraint = null;
m_physicsScene.DetailLog ("{0},BSActorLockAxis.RemoveAxisLockConstraint,destroyingConstraint",
m_controllingPrim.LocalID);
}
}
// Note that this relies on being called at TaintTime
void AddAxisLockConstraint ()
{
if (LockAxisConstraint == null)
{
// Lock that axis by creating a 6DOF constraint that has one end in the world and
// the other in the object.
// http://www.bulletphysics.org/Bullet/phpBB3/viewtopic.php?p=20817
// http://www.bulletphysics.org/Bullet/phpBB3/viewtopic.php?p=26380
// Remove any existing axis constraint (just to be sure)
RemoveAxisLockConstraint ();
BSConstraint6Dof axisConstrainer = new BSConstraint6Dof (m_physicsScene.World, m_controllingPrim.PhysBody,
OMV.Vector3.Zero, OMV.Quaternion.Identity,
false /* useLinearReferenceFrameB */, true /* disableCollisionsBetweenLinkedBodies */);
LockAxisConstraint = axisConstrainer;
m_physicsScene.Constraints.AddConstraint (LockAxisConstraint);
// Remember the clocking being inforce so we can notice if they have changed
LockAxisLinearFlags = m_controllingPrim.LockedLinearAxis;
LockAxisAngularFlags = m_controllingPrim.LockedAngularAxis;
// The constraint is tied to the world and oriented to the prim.
if (
!axisConstrainer.SetLinearLimits (m_controllingPrim.LockedLinearAxisLow,
m_controllingPrim.LockedLinearAxisHigh))
{
m_physicsScene.DetailLog ("{0},BSActorLockAxis.AddAxisLockConstraint,failedSetLinearLimits",
m_controllingPrim.LocalID);
}
if (
!axisConstrainer.SetAngularLimits (m_controllingPrim.LockedAngularAxisLow,
m_controllingPrim.LockedAngularAxisHigh))
{
m_physicsScene.DetailLog ("{0},BSActorLockAxis.AddAxisLockConstraint,failedSetAngularLimits", m_controllingPrim.LocalID);
}
m_physicsScene.DetailLog (
"{0},BSActorLockAxis.AddAxisLockConstraint,create,linLow={1},linHi={2},angLow={3},angHi={4}",
m_controllingPrim.LocalID, m_controllingPrim.LockedLinearAxisLow,
m_controllingPrim.LockedLinearAxisHigh, m_controllingPrim.LockedAngularAxisLow,
m_controllingPrim.LockedAngularAxisHigh);
// Constants from one of the posts mentioned above and used in Bullet's ConstraintDemo.
axisConstrainer.TranslationalLimitMotor (true /* enable */, 5.0f, 0.1f);
axisConstrainer.RecomputeConstraintVariables (m_controllingPrim.RawMass);
RegisterForBeforeStepCallback ();
}
}
public BSLinkInfoConstraint(BSPrimLinkable pMember) : base(pMember)
{
constraint = null;
ResetLink();
member.PhysicsScene.DetailLog("{0},BSLinkInfoConstraint.creation", member.LocalID);
}
