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/*
* Copyright (c) Contributors, http://opensimulator.org/
* See CONTRIBUTORS.TXT for a full list of copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyrightD
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the OpenSimulator Project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using OMV = OpenMetaverse;
namespace OpenSim.Region.Physics.BulletSPlugin
{
public class BSActorLockAxis : BSActor
{
bool TryExperimentalLockAxisCode = false;
BSConstraint LockAxisConstraint = null;
public BSActorLockAxis(BSScene physicsScene, BSPhysObject pObj, string actorName)
: base(physicsScene, pObj,actorName)
{
PhysicsScene.DetailLog("{0},BSActorLockAxis,constructor", Prim.LocalID);
LockAxisConstraint = null;
}
// BSActor.isActive
public override bool isActive
{
get { return Enabled && Prim.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()
{
PhysicsScene.DetailLog("{0},BSActorLockAxis,refresh,lockedAxis={1},enabled={2},pActive={3}",
Prim.LocalID, Prim.LockedAxis, Enabled, Prim.IsPhysicallyActive);
// If all the axis are free, we don't need to exist
if (Prim.LockedAxis == Prim.LockedAxisFree)
{
Prim.PhysicalActors.RemoveAndRelease(ActorName);
return;
}
// If the object is physically active, add the axis locking constraint
if (Enabled
&& Prim.IsPhysicallyActive
&& TryExperimentalLockAxisCode
&& Prim.LockedAxis != Prim.LockedAxisFree)
{
if (LockAxisConstraint != null)
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.RemoveBodyDependencies()
public override void RemoveBodyDependencies()
{
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.
PhysicsScene.PostTaintObject(Prim.LockedAxisActorName, Prim.LocalID, delegate()
{
Refresh();
});
}
}
private void AddAxisLockConstraint()
{
// 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(PhysicsScene.World, Prim.PhysBody,
OMV.Vector3.Zero, OMV.Quaternion.Inverse(Prim.RawOrientation),
true /* useLinearReferenceFrameB */, true /* disableCollisionsBetweenLinkedBodies */);
LockAxisConstraint = axisConstrainer;
PhysicsScene.Constraints.AddConstraint(LockAxisConstraint);
// The constraint is tied to the world and oriented to the prim.
// Free to move linearly
OMV.Vector3 linearLow = OMV.Vector3.Zero;
OMV.Vector3 linearHigh = PhysicsScene.TerrainManager.DefaultRegionSize;
axisConstrainer.SetLinearLimits(linearLow, linearHigh);
// Angular with some axis locked
float f2PI = (float)Math.PI * 2f;
OMV.Vector3 angularLow = new OMV.Vector3(-f2PI, -f2PI, -f2PI);
OMV.Vector3 angularHigh = new OMV.Vector3(f2PI, f2PI, f2PI);
if (Prim.LockedAxis.X != 1f)
{
angularLow.X = 0f;
angularHigh.X = 0f;
}
if (Prim.LockedAxis.Y != 1f)
{
angularLow.Y = 0f;
angularHigh.Y = 0f;
}
if (Prim.LockedAxis.Z != 1f)
{
angularLow.Z = 0f;
angularHigh.Z = 0f;
}
axisConstrainer.SetAngularLimits(angularLow, angularHigh);
PhysicsScene.DetailLog("{0},BSPrim.LockAngularMotion,create,linLow={1},linHi={2},angLow={3},angHi={4}",
Prim.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(Prim.RawMass);
}
private void RemoveAxisLockConstraint()
{
if (LockAxisConstraint != null)
{
PhysicsScene.Constraints.RemoveAndDestroyConstraint(LockAxisConstraint);
LockAxisConstraint = null;
PhysicsScene.DetailLog("{0},BSPrim.CleanUpLockAxisPhysicals,destroyingConstraint", Prim.LocalID);
}
}
}
}
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