// When the linkset is built, the child shape is added to the compound shape relative to the
// root shape. The linkset then moves around but this does not move the actual child
// prim. The child prim's location must be recomputed based on the location of the root shape.
private void RecomputeChildWorldPosition(BSPhysObject child, bool inTaintTime)
{
BSLinksetCompoundInfo lci = child.LinksetInfo as BSLinksetCompoundInfo;
if (lci != null)
{
if (inTaintTime)
{
OMV.Vector3 oldPos = child.RawPosition;
child.ForcePosition = LinksetRoot.RawPosition + lci.OffsetPos;
child.ForceOrientation = LinksetRoot.RawOrientation * lci.OffsetRot;
DetailLog("{0},BSLinksetCompound.RecomputeChildWorldPosition,oldPos={1},lci={2},newPos={3}",
child.LocalID, oldPos, lci, child.RawPosition);
}
else
{
// TaintedObject is not used here so the raw position is set now and not at taint-time.
child.Position = LinksetRoot.RawPosition + lci.OffsetPos;
child.Orientation = LinksetRoot.RawOrientation * lci.OffsetRot;
}
}
else
{
// This happens when children have been added to the linkset but the linkset
// has not been constructed yet. So like, at taint time, adding children to a linkset
// and then changing properties of the children (makePhysical, for instance)
// but the post-print action of actually rebuilding the linkset has not yet happened.
// PhysicsScene.Logger.WarnFormat("{0} Restoring linkset child position failed because of no relative position computed. ID={1}",
// LogHeader, child.LocalID);
DetailLog("{0},BSLinksetCompound.recomputeChildWorldPosition,noRelativePositonInfo", child.LocalID);
}
}
// Called before the simulation step to make sure the compound based linkset
// is all initialized.
// Constraint linksets are rebuilt every time.
// Note that this works for rebuilding just the root after a linkset is taken apart.
// Called at taint time!!
private void RecomputeLinksetCompound()
{
try
{
// Suppress rebuilding while rebuilding
Rebuilding = true;
// Cause the root shape to be rebuilt as a compound object with just the root in it
LinksetRoot.ForceBodyShapeRebuild(true);
DetailLog("{0},BSLinksetCompound.RecomputeLinksetCompound,start,rBody={1},rShape={2},numChildren={3}",
LinksetRoot.LocalID, LinksetRoot.PhysBody, LinksetRoot.PhysShape, NumberOfChildren);
// Add a shape for each of the other children in the linkset
ForEachMember(delegate(BSPhysObject cPrim)
{
if (!IsRoot(cPrim))
{
// Compute the displacement of the child from the root of the linkset.
// This info is saved in the child prim so the relationship does not
// change over time and the new child position can be computed
// when the linkset is being disassembled (the linkset may have moved).
BSLinksetCompoundInfo lci = cPrim.LinksetInfo as BSLinksetCompoundInfo;
if (lci == null)
{
// Each child position and rotation is given relative to the root.
OMV.Quaternion invRootOrientation = OMV.Quaternion.Inverse(LinksetRoot.RawOrientation);
OMV.Vector3 displacementPos = (cPrim.RawPosition - LinksetRoot.RawPosition) * invRootOrientation;
OMV.Quaternion displacementRot = cPrim.RawOrientation * invRootOrientation;
// Save relative position for recomputing child's world position after moving linkset.
lci = new BSLinksetCompoundInfo(displacementPos, displacementRot);
cPrim.LinksetInfo = lci;
DetailLog("{0},BSLinksetCompound.RecomputeLinksetCompound,creatingRelPos,lci={1}", cPrim.LocalID, lci);
}
DetailLog("{0},BSLinksetCompound.RecomputeLinksetCompound,addMemberToShape,mID={1},mShape={2},dispPos={3},dispRot={4}",
LinksetRoot.LocalID, cPrim.LocalID, cPrim.PhysShape, lci.OffsetPos, lci.OffsetRot);
if (cPrim.PhysShape.isNativeShape)
{
// A native shape is turning into a hull collision shape because native
// shapes are not shared so we have to hullify it so it will be tracked
// and freed at the correct time. This also solves the scaling problem
// (native shapes scaled but hull/meshes are assumed to not be).
// TODO: decide of the native shape can just be used in the compound shape.
// Use call to CreateGeomNonSpecial().
BulletShape saveShape = cPrim.PhysShape;
cPrim.PhysShape.Clear(); // Don't let the create free the child's shape
// PhysicsScene.Shapes.CreateGeomNonSpecial(true, cPrim, null);
PhysicsScene.Shapes.CreateGeomMeshOrHull(cPrim, null);
BulletShape newShape = cPrim.PhysShape;
cPrim.PhysShape = saveShape;
PhysicsScene.PE.AddChildShapeToCompoundShape(LinksetRoot.PhysShape, newShape, lci.OffsetPos, lci.OffsetRot);
}
else
{
// For the shared shapes (meshes and hulls), just use the shape in the child.
// The reference count added here will be decremented when the compound shape
// is destroyed in BSShapeCollection (the child shapes are looped over and dereferenced).
if (PhysicsScene.Shapes.ReferenceShape(cPrim.PhysShape))
{
PhysicsScene.Logger.ErrorFormat("{0} Rebuilt sharable shape when building linkset! Region={1}, primID={2}, shape={3}",
LogHeader, PhysicsScene.RegionName, cPrim.LocalID, cPrim.PhysShape);
}
PhysicsScene.PE.AddChildShapeToCompoundShape(LinksetRoot.PhysShape, cPrim.PhysShape, lci.OffsetPos, lci.OffsetRot);
}
}
return false; // 'false' says to move onto the next child in the list
});
// With all of the linkset packed into the root prim, it has the mass of everyone.
LinksetMass = ComputeLinksetMass();
LinksetRoot.UpdatePhysicalMassProperties(LinksetMass, true);
}
finally
{
Rebuilding = false;
}
PhysicsScene.PE.RecalculateCompoundShapeLocalAabb(LinksetRoot.PhysShape);
}
// Called before the simulation step to make sure the compound based linkset
// is all initialized.
// Constraint linksets are rebuilt every time.
// Note that this works for rebuilding just the root after a linkset is taken apart.
// Called at taint time!!
private void RecomputeLinksetCompound()
{
try
{
// Suppress rebuilding while rebuilding
Rebuilding = true;
// Cause the root shape to be rebuilt as a compound object with just the root in it
LinksetRoot.ForceBodyShapeRebuild(true);
DetailLog("{0},BSLinksetCompound.RecomputeLinksetCompound,start,rBody={1},rShape={2},numChildren={3}",
LinksetRoot.LocalID, LinksetRoot.PhysBody, LinksetRoot.PhysShape, NumberOfChildren);
// Add a shape for each of the other children in the linkset
ForEachMember(delegate(BSPhysObject cPrim)
{
if (!IsRoot(cPrim))
{
// Compute the displacement of the child from the root of the linkset.
// This info is saved in the child prim so the relationship does not
// change over time and the new child position can be computed
// when the linkset is being disassembled (the linkset may have moved).
BSLinksetCompoundInfo lci = cPrim.LinksetInfo as BSLinksetCompoundInfo;
if (lci == null)
{
// Each child position and rotation is given relative to the root.
OMV.Quaternion invRootOrientation = OMV.Quaternion.Inverse(LinksetRoot.RawOrientation);
OMV.Vector3 displacementPos = (cPrim.RawPosition - LinksetRoot.RawPosition) * invRootOrientation;
OMV.Quaternion displacementRot = cPrim.RawOrientation * invRootOrientation;
// Save relative position for recomputing child's world position after moving linkset.
lci = new BSLinksetCompoundInfo(displacementPos, displacementRot);
cPrim.LinksetInfo = lci;
DetailLog("{0},BSLinksetCompound.RecomputeLinksetCompound,creatingRelPos,lci={1}", cPrim.LocalID, lci);
}
DetailLog("{0},BSLinksetCompound.RecomputeLinksetCompound,addMemberToShape,mID={1},mShape={2},dispPos={3},dispRot={4}",
LinksetRoot.LocalID, cPrim.LocalID, cPrim.PhysShape, lci.OffsetPos, lci.OffsetRot);
if (cPrim.PhysShape.isNativeShape)
{
// A native shape is turning into a hull collision shape because native
// shapes are not shared so we have to hullify it so it will be tracked
// and freed at the correct time. This also solves the scaling problem
// (native shapes scaled but hull/meshes are assumed to not be).
// TODO: decide of the native shape can just be used in the compound shape.
// Use call to CreateGeomNonSpecial().
BulletShape saveShape = cPrim.PhysShape;
cPrim.PhysShape.Clear(); // Don't let the create free the child's shape
// PhysicsScene.Shapes.CreateGeomNonSpecial(true, cPrim, null);
PhysicsScene.Shapes.CreateGeomMeshOrHull(cPrim, null);
BulletShape newShape = cPrim.PhysShape;
cPrim.PhysShape = saveShape;
PhysicsScene.PE.AddChildShapeToCompoundShape(LinksetRoot.PhysShape, newShape, lci.OffsetPos, lci.OffsetRot);
}
else
{
// For the shared shapes (meshes and hulls), just use the shape in the child.
// The reference count added here will be decremented when the compound shape
// is destroyed in BSShapeCollection (the child shapes are looped over and dereferenced).
if (PhysicsScene.Shapes.ReferenceShape(cPrim.PhysShape))
{
PhysicsScene.Logger.ErrorFormat("{0} Rebuilt sharable shape when building linkset! Region={1}, primID={2}, shape={3}",
LogHeader, PhysicsScene.RegionName, cPrim.LocalID, cPrim.PhysShape);
}
PhysicsScene.PE.AddChildShapeToCompoundShape(LinksetRoot.PhysShape, cPrim.PhysShape, lci.OffsetPos, lci.OffsetRot);
}
}
return(false); // 'false' says to move onto the next child in the list
});
// With all of the linkset packed into the root prim, it has the mass of everyone.
LinksetMass = ComputeLinksetMass();
LinksetRoot.UpdatePhysicalMassProperties(LinksetMass, true);
}
finally
{
Rebuilding = false;
}
PhysicsScene.PE.RecalculateCompoundShapeLocalAabb(LinksetRoot.PhysShape);
}