/// <summary>
/// It checks for two collision boxes.
/// </summary>
/// <param name="sourceCollide">Source collision box</param>
/// <param name="targetCollide">Target collision box</param>
/// <param name="result">A result report</param>
/// <returns>True if there is a collision</returns>
public bool TestBoxintersectBox(CollideBox sourceCollide,
CollideBox targetCollide,
ref CollisionResult result)
{
totalCollidingCount++;
// // Test two boxes
if (sourceCollide.BoundingBox.Intersects(targetCollide.BoundingBox))
{
if (result != null)
{
Vector3 centerSourceBox = 0.5f *
(sourceCollide.BoundingBox.Max + sourceCollide.BoundingBox.Min);
Vector3 centerTargetBox = 0.5f *
(targetCollide.BoundingBox.Max + targetCollide.BoundingBox.Min);
result.distance =
(float)Vector3.Distance(centerSourceBox, centerTargetBox);
result.detectedCollide = targetCollide;
result.intersect = null;
result.normal = null;
result.collideCount++;
}
return(true);
}
return(false);
}
/// <summary>
/// It checks for the collision between a collision ray and a collision box.
/// </summary>
/// <param name="sourceCollide">Source collision ray</param>
/// <param name="targetCollide">Target collision box</param>
/// <param name="result">A result report</param>
/// <returns>True if there is a collision</returns>
public bool TestRayintersectBox(CollideRay sourceCollide,
CollideBox targetCollide,
ref CollisionResult result)
{
totalCollidingCount++;
// Test ray with the box
float?distance = sourceCollide.Ray.Intersects(targetCollide.BoundingBox);
if (distance != null)
{
if (result != null)
{
result.distance = (float)distance;
result.detectedCollide = targetCollide;
result.intersect = null;
result.normal = null;
result.collideCount++;
}
return(true);
}
return(false);
}
/// <summary>
/// It checks for the collision between a collision sphere and a collision box.
/// </summary>
/// <param name="sourceCollide">Source collision ray</param>
/// <param name="targetCollide">Target collision box</param>
/// <param name="result">A result report</param>
/// <returns>True if there is a collision</returns>
public bool TestSphereintersectBox(CollideSphere sourceCollide,
CollideBox targetCollide,
ref CollisionResult result)
{
totalCollidingCount++;
// Test sphere with the box
if (sourceCollide.BoundingSphere.Intersects(targetCollide.BoundingBox))
{
if (result != null)
{
Vector3 centerBox = 0.5f *
(targetCollide.BoundingBox.Max + targetCollide.BoundingBox.Min);
result.distance = (float)Vector3.Distance(
sourceCollide.BoundingSphere.Center, centerBox)
- sourceCollide.BoundingSphere.Radius;
result.detectedCollide = targetCollide;
result.intersect = null;
result.normal = null;
result.collideCount++;
}
return(true);
}
return(false);
}
/// <summary>
/// checks contaning.
/// </summary>
public bool Contains(ref CollideElement bounds)
{
if (bounds is CollideBox)
{
CollideBox target = bounds as CollideBox;
return(containBox.Intersects(target.BoundingBox));
}
else if (bounds is CollideSphere)
{
CollideSphere target = bounds as CollideSphere;
return(containBox.Intersects(target.BoundingSphere));
}
else if (bounds is CollideRay)
{
CollideRay target = bounds as CollideRay;
return(containBox.Intersects(target.Ray) != null);
}
return(false);
}
/// <summary>
/// It tests for collision among the collision elements which
/// have been registered to the collision layer and returns the result.
/// </summary>
/// <param name="collide">Source collsion element</param>
/// <param name="targetLayer">Target collison layer</param>
/// <param name="resultType">type of result</param>
/// <returns>A result report</returns>
public CollisionResult HitTest(CollideElement collide,
ref CollisionLayer targetLayer,
ResultType resultType)
{
CollisionResult result = null;
tempResult.Clear();
totalCollidingCount = 0;
if (activeOn == false)
{
return(null);
}
if (collide == null)
{
throw new ArgumentNullException("collide");
}
if (targetLayer == null)
{
throw new ArgumentNullException("targetLayer");
}
// checking all collisions in current collision layer
for (int i = 0; i < targetLayer.CollideCount; i++)
{
CollideElement targetCollide = targetLayer.GetCollide(i);
// Skip ifself
if (collide.Equals(targetCollide))
{
continue;
}
else if (collide.Id != 0 && targetCollide.Id != 0)
{
if (collide.Id == targetCollide.Id)
{
continue;
}
}
// If source collision is BoundingSphere
if (collide is CollideSphere)
{
CollideSphere sourceCollideSphere = collide as CollideSphere;
// Test with target sphere
if (targetCollide is CollideSphere)
{
CollideSphere targetCollideSphere =
targetCollide as CollideSphere;
TestSphereintersectSphere(sourceCollideSphere,
targetCollideSphere, ref tempResult);
}
// Test with target model
else if (targetCollide is CollideModel)
{
CollideModel targetCollideModel =
targetCollide as CollideModel;
TestSphereintersectModel(sourceCollideSphere,
targetCollideModel, ref tempResult);
}
// Test with target box
else if (targetCollide is CollideBox)
{
CollideBox targetCollideBox = targetCollide as CollideBox;
TestSphereintersectBox(sourceCollideSphere,
targetCollideBox, ref tempResult);
}
// Test with target ray
if (targetCollide is CollideRay)
{
CollideRay targetCollideRay =
targetCollide as CollideRay;
TestRayintersectSphere(targetCollideRay,
sourceCollideSphere, ref tempResult);
}
}
// If source collision is Ray
else if (collide is CollideRay)
{
CollideRay sourceCollideRay = collide as CollideRay;
// Test with target model
if (targetCollide is CollideModel)
{
CollideModel targetCollideModel =
targetCollide as CollideModel;
TestRayintersectModel(sourceCollideRay,
targetCollideModel, ref tempResult);
}
// Test with target sphere
else if (targetCollide is CollideSphere)
{
CollideSphere targetCollideSphere =
targetCollide as CollideSphere;
TestRayintersectSphere(sourceCollideRay,
targetCollideSphere, ref tempResult);
}
// Test with target box
else if (targetCollide is CollideBox)
{
CollideBox targetCollideBox = targetCollide as CollideBox;
TestRayintersectBox(sourceCollideRay,
targetCollideBox, ref tempResult);
}
}
// If source collision is Ray
else if (collide is CollideBox)
{
CollideBox sourceCollideBox = collide as CollideBox;
// Test with target sphere
if (targetCollide is CollideSphere)
{
CollideSphere targetCollideSphere =
targetCollide as CollideSphere;
TestSphereintersectBox(targetCollideSphere,
sourceCollideBox, ref tempResult);
}
// Test with target box
else if (targetCollide is CollideBox)
{
CollideBox targetCollideBox = targetCollide as CollideBox;
TestBoxintersectBox(sourceCollideBox,
targetCollideBox, ref tempResult);
}
// Test with target ray
else if (targetCollide is CollideRay)
{
CollideRay targetCollideRay = targetCollide as CollideRay;
TestRayintersectBox(targetCollideRay,
sourceCollideBox, ref tempResult);
}
}
// To find the nearest detected collision.
if (resultType == ResultType.NearestOne)
{
if (tempResult.collideCount > 0)
{
if (result == null)
{
result = new CollisionResult();
result.distance = float.MaxValue;
}
if (result.distance > tempResult.distance)
{
tempResult.CopyTo(ref result);
}
}
}
}
return(result);
}
/// <summary>
/// It checks for two collision boxes.
/// </summary>
/// <param name="sourceCollide">Source collision box</param>
/// <param name="targetCollide">Target collision box</param>
/// <param name="result">A result report</param>
/// <returns>True if there is a collision</returns>
public bool TestBoxintersectBox(CollideBox sourceCollide,
CollideBox targetCollide,
ref CollisionResult result)
{
totalCollidingCount++;
// // Test two boxes
if (sourceCollide.BoundingBox.Intersects(targetCollide.BoundingBox))
{
if (result != null)
{
Vector3 centerSourceBox = 0.5f *
(sourceCollide.BoundingBox.Max + sourceCollide.BoundingBox.Min);
Vector3 centerTargetBox = 0.5f *
(targetCollide.BoundingBox.Max + targetCollide.BoundingBox.Min);
result.distance =
(float)Vector3.Distance(centerSourceBox, centerTargetBox);
result.detectedCollide = targetCollide;
result.intersect = null;
result.normal = null;
result.collideCount++;
}
return true;
}
return false;
}
/// <summary>
/// It checks for the collision between a collision sphere and a collision box.
/// </summary>
/// <param name="sourceCollide">Source collision ray</param>
/// <param name="targetCollide">Target collision box</param>
/// <param name="result">A result report</param>
/// <returns>True if there is a collision</returns>
public bool TestSphereintersectBox(CollideSphere sourceCollide,
CollideBox targetCollide,
ref CollisionResult result)
{
totalCollidingCount++;
// Test sphere with the box
if (sourceCollide.BoundingSphere.Intersects(targetCollide.BoundingBox))
{
if (result != null)
{
Vector3 centerBox = 0.5f *
(targetCollide.BoundingBox.Max + targetCollide.BoundingBox.Min);
result.distance = (float)Vector3.Distance(
sourceCollide.BoundingSphere.Center, centerBox)
- sourceCollide.BoundingSphere.Radius;
result.detectedCollide = targetCollide;
result.intersect = null;
result.normal = null;
result.collideCount++;
}
return true;
}
return false;
}
/// <summary>
/// It checks for the collision between a collision ray and a collision box.
/// </summary>
/// <param name="sourceCollide">Source collision ray</param>
/// <param name="targetCollide">Target collision box</param>
/// <param name="result">A result report</param>
/// <returns>True if there is a collision</returns>
public bool TestRayintersectBox(CollideRay sourceCollide,
CollideBox targetCollide,
ref CollisionResult result)
{
totalCollidingCount++;
// Test ray with the box
float? distance = sourceCollide.Ray.Intersects(targetCollide.BoundingBox);
if (distance != null)
{
if (result != null)
{
result.distance = (float)distance;
result.detectedCollide = targetCollide;
result.intersect = null;
result.normal = null;
result.collideCount++;
}
return true;
}
return false;
}
