/// <summary>
/// Applies buoyancy forces to appropriate objects.
/// Called automatically when needed by the owning Space.
/// </summary>
/// <param name="dt">Time since last frame in physical logic.</param>
void IDuringForcesUpdateable.Update(float dt)
{
QueryAccelerator.GetEntries(boundingBox, broadPhaseEntries);
//TODO: Could integrate the entire thing into the collision detection pipeline. Applying forces
//in the collision detection pipeline isn't allowed, so there'd still need to be an Updateable involved.
//However, the broadphase query would be eliminated and the raycasting work would be automatically multithreaded.
this.dt = dt;
//Don't always multithread. For small numbers of objects, the overhead of using multithreading isn't worth it.
//Could tune this value depending on platform for better performance.
if (broadPhaseEntries.Count > 30 && ParallelLooper != null && ParallelLooper.ThreadCount > 1)
{
ParallelLooper.ForLoop(0, broadPhaseEntries.Count, analyzeCollisionEntryDelegate);
}
else
{
for (int i = 0; i < broadPhaseEntries.Count; i++)
{
AnalyzeEntry(i);
}
}
broadPhaseEntries.Clear();
}
/// <summary>
/// Updates the listing of contained entities and their states after the end of a space update.
/// </summary>
/// <param name="dt">Time since last frame in simulation seconds.</param>
void IEndOfTimeStepUpdateable.Update(float dt)
{
//Get rid of any entities that are no longer nearby.
foreach (Entity e in nearbyEntities.Keys)
{
if (!(e.CollisionInformation.BoundingBox.Intersects(TriangleMesh.Tree.BoundingBox)))
{
entities.Add(e);
}
}
for (int i = 0; i < entities.count; i++)
{
var e = entities.Elements[i];
if (nearbyEntities[e].IsContained)
{
//STOPS CONTAINED event
if (VolumeStopsContainingEntity != null)
{
VolumeStopsContainingEntity(this, e);
}
}
if (nearbyEntities[e].IsTouching)
{
//STOPS TOUCHING event
if (EntityStopsTouching != null)
{
EntityStopsTouching(e, this);
}
}
nearbyEntities.Remove(e);
}
entities.Clear();
//Get an updated look at all included entities.
QueryAccelerator.GetEntries(TriangleMesh.Tree.BoundingBox, entries);
for (int i = 0; i < entries.count; i++)
{
var e = entries.Elements[i] as EntityCollidable;
if (e != null && CollisionRules.collisionRuleCalculator(e.collisionRules, collisionRules) <= CollisionRule.NoSolver)
{
entities.Add(e.Entity);
}
}
entries.Clear();
ContainmentState containmentState;
for (int i = 0; i < entities.count; i++)
{
var e = entities.Elements[i];
bool isContained;
bool isTouching = IsEntityIntersectingVolume(e, out isContained);
if (nearbyEntities.TryGetValue(e, out containmentState))
{
if (!containmentState.IsTouching && isTouching)
{
//BEGIN TOUCHING event
if (EntityBeginsTouching != null)
{
EntityBeginsTouching(e, this);
}
}
else if (containmentState.IsTouching && !isTouching)
{
//END TOUCHING event
if (EntityStopsTouching != null)
{
EntityStopsTouching(e, this);
}
}
if (!containmentState.IsContained && isContained)
{
//BEGIN CONTAINED event
if (VolumeBeginsContainingEntity != null)
{
VolumeBeginsContainingEntity(this, e);
}
}
else if (containmentState.IsContained && !isContained)
{
//END CONTAINED event
if (VolumeStopsContainingEntity != null)
{
VolumeStopsContainingEntity(this, e);
}
}
nearbyEntities[e] = new ContainmentState(isTouching, isContained);
}
else
{
//Add new entry for the new entity.
nearbyEntities.Add(e, new ContainmentState(isTouching, isContained));
if (isTouching)
{
//BEGIN TOUCHING event
if (EntityBeginsTouching != null)
{
EntityBeginsTouching(e, this);
}
}
if (isContained)
{
//BEGIN CONTAINED event
if (VolumeBeginsContainingEntity != null)
{
VolumeBeginsContainingEntity(this, e);
}
}
}
}
entities.Clear();
}