clockwerk-opensim-stable – Rev 1
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using OMV = OpenMetaverse;
namespace OpenSim.Region.Physics.BulletSPlugin
{
public class BSActorLockAxis : BSActor
{
BSConstraint LockAxisConstraint = null;
public BSActorLockAxis(BSScene physicsScene, BSPhysObject pObj, string actorName)
: base(physicsScene, pObj, actorName)
{
m_physicsScene.DetailLog("{0},BSActorLockAxis,constructor", m_controllingPrim.LocalID);
LockAxisConstraint = null;
}
// BSActor.isActive
public override bool isActive
{
get { return Enabled && m_controllingPrim.IsPhysicallyActive; }
}
// Release any connections and resources used by the actor.
// BSActor.Dispose()
public override void Dispose()
{
RemoveAxisLockConstraint();
}
// Called when physical parameters (properties set in Bullet) need to be re-applied.
// Called at taint-time.
// BSActor.Refresh()
public override void Refresh()
{
m_physicsScene.DetailLog("{0},BSActorLockAxis,refresh,lockedAxis={1},enabled={2},pActive={3}",
m_controllingPrim.LocalID, m_controllingPrim.LockedAngularAxis, Enabled, m_controllingPrim.IsPhysicallyActive);
// If all the axis are free, we don't need to exist
if (m_controllingPrim.LockedAngularAxis == m_controllingPrim.LockedAxisFree)
{
Enabled = false;
}
// If the object is physically active, add the axis locking constraint
if (isActive)
{
AddAxisLockConstraint();
}
else
{
RemoveAxisLockConstraint();
}
}
// The object's physical representation is being rebuilt so pick up any physical dependencies (constraints, ...).
// Register a prestep action to restore physical requirements before the next simulation step.
// Called at taint-time.
// BSActor.RemoveDependencies()
public override void RemoveDependencies()
{
if (LockAxisConstraint != null)
{
// If a constraint is set up, remove it from the physical scene
RemoveAxisLockConstraint();
// Schedule a call before the next simulation step to restore the constraint.
m_physicsScene.PostTaintObject("BSActorLockAxis:" + ActorName, m_controllingPrim.LocalID, delegate()
{
Refresh();
});
}
}
private 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);
// The constraint is tied to the world and oriented to the prim.
// Free to move linearly in the region
OMV.Vector3 linearLow = OMV.Vector3.Zero;
OMV.Vector3 linearHigh = m_physicsScene.TerrainManager.DefaultRegionSize;
if (m_controllingPrim.LockedLinearAxis.X != BSPhysObject.FreeAxis)
{
linearLow.X = m_controllingPrim.RawPosition.X;
linearHigh.X = m_controllingPrim.RawPosition.X;
}
if (m_controllingPrim.LockedLinearAxis.Y != BSPhysObject.FreeAxis)
{
linearLow.Y = m_controllingPrim.RawPosition.Y;
linearHigh.Y = m_controllingPrim.RawPosition.Y;
}
if (m_controllingPrim.LockedLinearAxis.Z != BSPhysObject.FreeAxis)
{
linearLow.Z = m_controllingPrim.RawPosition.Z;
linearHigh.Z = m_controllingPrim.RawPosition.Z;
}
axisConstrainer.SetLinearLimits(linearLow, linearHigh);
// Angular with some axis locked
float fPI = (float)Math.PI;
OMV.Vector3 angularLow = new OMV.Vector3(-fPI, -fPI, -fPI);
OMV.Vector3 angularHigh = new OMV.Vector3(fPI, fPI, fPI);
if (m_controllingPrim.LockedAngularAxis.X != BSPhysObject.FreeAxis)
{
angularLow.X = 0f;
angularHigh.X = 0f;
}
if (m_controllingPrim.LockedAngularAxis.Y != BSPhysObject.FreeAxis)
{
angularLow.Y = 0f;
angularHigh.Y = 0f;
}
if (m_controllingPrim.LockedAngularAxis.Z != BSPhysObject.FreeAxis)
{
angularLow.Z = 0f;
angularHigh.Z = 0f;
}
if (!axisConstrainer.SetAngularLimits(angularLow, angularHigh))
{
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, linearLow, linearHigh, angularLow, angularHigh);
// 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);
}
}
private void RemoveAxisLockConstraint()
{
if (LockAxisConstraint != null)
{
m_physicsScene.Constraints.RemoveAndDestroyConstraint(LockAxisConstraint);
LockAxisConstraint = null;
m_physicsScene.DetailLog("{0},BSActorLockAxis.RemoveAxisLockConstraint,destroyingConstraint", m_controllingPrim.LocalID);
}
}
}
}