// Get a reference to a physical shape. Create if it doesn't exist
public static BSShape GetShapeReference(BSScene physicsScene, bool forceRebuild, BSPhysObject prim)
{
BSShape ret = null;
if (prim.PreferredPhysicalShape == BSPhysicsShapeType.SHAPE_CAPSULE)
{
// an avatar capsule is close to a native shape (it is not shared)
ret = BSShapeNative.GetReference(physicsScene, prim, BSPhysicsShapeType.SHAPE_CAPSULE,
FixedShapeKey.KEY_CAPSULE);
physicsScene.DetailLog("{0},BSShape.GetShapeReference,avatarCapsule,shape={1}", prim.LocalID, ret);
}
// Compound shapes are handled special as they are rebuilt from scratch.
// This isn't too great a hardship since most of the child shapes will already been created.
if (ret == null && prim.PreferredPhysicalShape == BSPhysicsShapeType.SHAPE_COMPOUND)
{
// Getting a reference to a compound shape gets you the compound shape with the root prim shape added
ret = BSShapeCompound.GetReference(prim);
physicsScene.DetailLog("{0},BSShapeCollection.CreateGeom,compoundShape,shape={1}", prim.LocalID, ret);
}
if (ret == null)
ret = GetShapeReferenceNonSpecial(physicsScene, forceRebuild, prim);
return ret;
}
private bool UseBulletSimRootOffsetHack = false; // Attempt to have Bullet track the coords of root compound shape
private void RecomputeLinksetCompound()
{
try
{
Rebuilding = true;
// No matter what is being done, force the root prim's PhysBody and PhysShape to get set
// to what they should be as if the root was not in a linkset.
// Not that bad since we only get into this routine if there are children in the linkset and
// something has been updated/changed.
// Have to do the rebuild before checking for physical because this might be a linkset
// being destructed and going non-physical.
LinksetRoot.ForceBodyShapeRebuild(true);
// There is no reason to build all this physical stuff for a non-physical linkset.
if (!LinksetRoot.IsPhysicallyActive)
{
DetailLog("{0},BSLinksetCompound.RecomputeLinksetCompound,notPhysical", LinksetRoot.LocalID);
return; // Note the 'finally' clause at the botton which will get executed.
}
// Get a new compound shape to build the linkset shape in.
BSShape linksetShape = BSShapeCompound.GetReference(m_physicsScene);
// Compute a displacement for each component so it is relative to the center-of-mass.
// Bullet presumes an object's origin (relative <0,0,0>) is its center-of-mass
OMV.Vector3 centerOfMassW = ComputeLinksetCenterOfMass();
OMV.Quaternion invRootOrientation = OMV.Quaternion.Normalize(OMV.Quaternion.Inverse(LinksetRoot.RawOrientation));
OMV.Vector3 origRootPosition = LinksetRoot.RawPosition;
// 'centerDisplacementV' is the vehicle relative distance from the simulator root position to the center-of-mass
OMV.Vector3 centerDisplacementV = (centerOfMassW - LinksetRoot.RawPosition) * invRootOrientation;
if (UseBulletSimRootOffsetHack || !BSParam.LinksetOffsetCenterOfMass)
{
// Zero everything if center-of-mass displacement is not being done.
centerDisplacementV = OMV.Vector3.Zero;
LinksetRoot.ClearDisplacement();
}
else
{
// The actual center-of-mass could have been set by the user.
centerDisplacementV = LinksetRoot.SetEffectiveCenterOfMassDisplacement(centerDisplacementV);
}
DetailLog("{0},BSLinksetCompound.RecomputeLinksetCompound,COM,rootPos={1},com={2},comDisp={3}",
LinksetRoot.LocalID, origRootPosition, centerOfMassW, centerDisplacementV);
// Add the shapes of all the components of the linkset
int memberIndex = 1;
ForEachMember((cPrim) =>
{
if (IsRoot(cPrim))
{
// Root shape is always index zero.
cPrim.LinksetChildIndex = 0;
}
else
{
cPrim.LinksetChildIndex = memberIndex;
memberIndex++;
}
// Get a reference to the shape of the child for adding of that shape to the linkset compound shape
BSShape childShape = cPrim.PhysShape.GetReference(m_physicsScene, cPrim);
// Offset the child shape from the center-of-mass and rotate it to vehicle relative.
OMV.Vector3 offsetPos = (cPrim.RawPosition - origRootPosition) * invRootOrientation - centerDisplacementV;
OMV.Quaternion offsetRot = OMV.Quaternion.Normalize(cPrim.RawOrientation) * invRootOrientation;
// Add the child shape to the compound shape being built
m_physicsScene.PE.AddChildShapeToCompoundShape(linksetShape.physShapeInfo, childShape.physShapeInfo, offsetPos, offsetRot);
DetailLog("{0},BSLinksetCompound.RecomputeLinksetCompound,addChild,indx={1},cShape={2},offPos={3},offRot={4}",
LinksetRoot.LocalID, cPrim.LinksetChildIndex, childShape, offsetPos, offsetRot);
// Since we are borrowing the shape of the child, disable the origional child body
if (!IsRoot(cPrim))
{
m_physicsScene.PE.AddToCollisionFlags(cPrim.PhysBody, CollisionFlags.CF_NO_CONTACT_RESPONSE);
m_physicsScene.PE.ForceActivationState(cPrim.PhysBody, ActivationState.DISABLE_SIMULATION);
// We don't want collisions from the old linkset children.
m_physicsScene.PE.RemoveFromCollisionFlags(cPrim.PhysBody, CollisionFlags.BS_SUBSCRIBE_COLLISION_EVENTS);
cPrim.PhysBody.collisionType = CollisionType.LinksetChild;
}
return(false); // 'false' says to move onto the next child in the list
});
// Replace the root shape with the built compound shape.
// Object removed and added to world to get collision cache rebuilt for new shape.
LinksetRoot.PhysShape.Dereference(m_physicsScene);
LinksetRoot.PhysShape = linksetShape;
m_physicsScene.PE.RemoveObjectFromWorld(m_physicsScene.World, LinksetRoot.PhysBody);
m_physicsScene.PE.SetCollisionShape(m_physicsScene.World, LinksetRoot.PhysBody, linksetShape.physShapeInfo);
m_physicsScene.PE.AddObjectToWorld(m_physicsScene.World, LinksetRoot.PhysBody);
DetailLog("{0},BSLinksetCompound.RecomputeLinksetCompound,addBody,body={1},shape={2}",
LinksetRoot.LocalID, LinksetRoot.PhysBody, linksetShape);
// With all of the linkset packed into the root prim, it has the mass of everyone.
LinksetMass = ComputeLinksetMass();
LinksetRoot.UpdatePhysicalMassProperties(LinksetMass, true);
if (UseBulletSimRootOffsetHack)
{
// Enable the physical position updator to return the position and rotation of the root shape.
// This enables a feature in the C++ code to return the world coordinates of the first shape in the
// compound shape. This aleviates the need to offset the returned physical position by the
// center-of-mass offset.
// TODO: either debug this feature or remove it.
m_physicsScene.PE.AddToCollisionFlags(LinksetRoot.PhysBody, CollisionFlags.BS_RETURN_ROOT_COMPOUND_SHAPE);
}
}
finally
{
Rebuilding = false;
}
// See that the Aabb surrounds the new shape
m_physicsScene.PE.RecalculateCompoundShapeLocalAabb(LinksetRoot.PhysShape.physShapeInfo);
}
public static bool TryGetCompoundByPtr(BulletShape pShape, out BSShapeCompound outCompound)
{
lock (CompoundShapes)
{
string addr = pShape.AddrString;
return CompoundShapes.TryGetValue(addr, out outCompound);
}
}
public static BSShape GetReference(BSScene physicsScene)
{
// Base compound shapes are not shared so this returns a raw shape.
// A built compound shape can be reused in linksets.
BSShapeCompound ret = new BSShapeCompound(CreatePhysicalCompoundShape(physicsScene));
CompoundShapes.Add(ret.AddrString, ret);
return ret;
}
// Sometimes we have a pointer to a collision shape but don't know what type it is.
// Figure out type and call the correct dereference routine.
// Called at taint-time.
private void DereferenceAnonCollisionShape(BSScene physicsScene, BulletShape pShape)
{
BSShapeMesh meshDesc;
if (BSShapeMesh.TryGetMeshByPtr(pShape, out meshDesc))
{
meshDesc.Dereference(physicsScene);
}
else
{
BSShapeHull hullDesc;
if (BSShapeHull.TryGetHullByPtr(pShape, out hullDesc))
{
hullDesc.Dereference(physicsScene);
}
else
{
BSShapeConvexHull chullDesc;
if (BSShapeConvexHull.TryGetHullByPtr(pShape, out chullDesc))
{
chullDesc.Dereference(physicsScene);
}
else
{
if (physicsScene.PE.IsCompound(pShape))
{
BSShapeCompound recursiveCompound = new BSShapeCompound(pShape);
recursiveCompound.Dereference(physicsScene);
}
else
{
if (physicsScene.PE.IsNativeShape(pShape))
{
BSShapeNative nativeShape = new BSShapeNative(pShape);
nativeShape.Dereference(physicsScene);
}
}
}
}
}
}
// Sometimes we have a pointer to a collision shape but don't know what type it is.
// Figure out type and call the correct dereference routine.
// Called at taint-time.
private void DereferenceAnonCollisionShape(BSScene physicsScene, BulletShape pShape)
{
// TODO: figure a better way to go through all the shape types and find a possible instance.
BSShapeMesh meshDesc;
if (BSShapeMesh.TryGetMeshByPtr(pShape, out meshDesc))
{
meshDesc.Dereference(physicsScene);
}
else
{
BSShapeHull hullDesc;
if (BSShapeHull.TryGetHullByPtr(pShape, out hullDesc))
{
hullDesc.Dereference(physicsScene);
}
else
{
BSShapeConvexHull chullDesc;
if (BSShapeConvexHull.TryGetHullByPtr(pShape, out chullDesc))
{
chullDesc.Dereference(physicsScene);
}
else
{
BSShapeGImpact gImpactDesc;
if (BSShapeGImpact.TryGetGImpactByPtr(pShape, out gImpactDesc))
{
gImpactDesc.Dereference(physicsScene);
}
else
{
// Didn't find it in the lists of specific types. It could be compound.
if (physicsScene.PE.IsCompound(pShape))
{
BSShapeCompound recursiveCompound = new BSShapeCompound(pShape);
recursiveCompound.Dereference(physicsScene);
}
else
{
// If none of the above, maybe it is a simple native shape.
if (physicsScene.PE.IsNativeShape(pShape))
{
BSShapeNative nativeShape = new BSShapeNative(pShape);
nativeShape.Dereference(physicsScene);
}
}
}
}
}
}
}
