public TestEntry(
CollisionEntity entityA,
CollisionEntity entityB
)
{
this.EntityA = entityA;
this.EntityB = entityB;
}
/// <summary>
/// this method is a bit hacky since I did not know where to place it. I may move it to a better
/// place somewhen in the future
/// </summary>
/// <param name="ray"></param>
/// <param name="entity"></param>
public bool GetIntersectionPoint(
ref Ray3 ray,
Entity entity,
out Vector3 outIsectPt
)
{
// find the matching collision entity (in order to get the alignedbox3tree
CollisionEntity collisionEntity = testList.GetCollisionEntity(entity);
if (collisionEntity == null)
{
outIsectPt = Vector3.Zero;
return(false);
}
Debug.Assert(collisionEntity.VolumeType == VolumeType.AlignedBox3Tree);
if (collisionEntity.VolumeType != VolumeType.AlignedBox3Tree)
{
outIsectPt = Vector3.Zero;
return(false);
}
// get world transform of from the given entity
Matrix worldTransform;
AlignedBox3Tree tree = (AlignedBox3Tree)collisionEntity.Volumes[0];
OrientationHelper.CalculateWorldTransform(entity, out worldTransform);
// transform the ray into the coordinate system of the entity
Matrix worldToEntityTransform = Matrix.Invert(worldTransform);
Matrix inverseTransposeWorldToEntityTransform = Matrix.Transpose(Matrix.Invert(worldToEntityTransform));
Vector3 entitySpaceRayOrigin = Vector3.Transform(ray.Origin, worldToEntityTransform);
Vector3 entitySpaceRayDirection = Vector3.Transform(ray.Direction, inverseTransposeWorldToEntityTransform);
entitySpaceRayDirection.Normalize();
Ray3 entitySpaceRay = new Ray3(entitySpaceRayOrigin, entitySpaceRayDirection);
float t; // parameter on ray, outIsectPt = ray.Origin + t * ray.Direction;
bool intersection = GetIntersectionPoint(ref entitySpaceRay, tree.Root, tree.Positions, out t);
if (intersection)
{
outIsectPt = Vector3.Transform(entitySpaceRay.Origin + t * entitySpaceRay.Direction, worldTransform);
}
else
{
outIsectPt = Vector3.Zero;
}
return(intersection);
}
public void Remove(CollisionEntity entity)
{
Debug.Assert(inCollisionDetection == 0);
for (int i = 0; i < collisionList.Count; ++i)
{
if (collisionList[i].EntityA == entity ||
collisionList[i].EntityB == entity)
{
collisionList.RemoveAt(i);
--i;
}
}
entityList.Remove(entity);
}
public void Add(CollisionEntity entity)
{
Debug.Assert(inCollisionDetection == 0);
foreach (CollisionEntity otherEntity in entityList)
{
/*if (entity.Entity.HasString(CommonNames.Kind) && entity.Entity.GetString(CommonNames.Kind) == "pillar" &&
* otherEntity.Entity.HasString(CommonNames.Kind) && otherEntity.Entity.GetString(CommonNames.Kind) == "pillar")
* {
* continue;
* }
* if (
* (
* entity.Entity.HasString(CommonNames.Kind) && entity.Entity.GetString(CommonNames.Kind) == "pillar" &&
* otherEntity.Entity.HasString(CommonNames.Kind) && otherEntity.Entity.GetString(CommonNames.Kind) == "powerup") ||
* (otherEntity.Entity.HasString(CommonNames.Kind) && otherEntity.Entity.GetString(CommonNames.Kind) == "pillar" &&
* entity.Entity.HasString(CommonNames.Kind) && entity.Entity.GetString(CommonNames.Kind) == "powerup"))
* {
* continue;
* }
* if (
* (entity.Entity.HasString(CommonNames.Kind) && entity.Entity.GetString(CommonNames.Kind) == "island" &&
* otherEntity.Entity.HasString(CommonNames.Kind) && otherEntity.Entity.GetString(CommonNames.Kind) == "powerup") ||
* (otherEntity.Entity.HasString(CommonNames.Kind) && otherEntity.Entity.GetString(CommonNames.Kind) == "island" &&
* entity.Entity.HasString(CommonNames.Kind) && entity.Entity.GetString(CommonNames.Kind) == "powerup"))
* {
* continue;
* }*/
collisionList.Add(new TestEntry(entity, otherEntity));
}
/*Console.WriteLine("number of collision tests: {0}", collisionList.Count);
* if (collisionList.Count == 200)
* {
* foreach (TestEntry entry in collisionList)
* {
* Console.WriteLine("colliding {0} with {1}", entry.EntityA.Entity.Name, entry.EntityB.Entity.Name);
* }
* }*/
entityList.Add(entity);
}