/// <summary>
/// Release the pickable object held if any.
/// </summary>
protected virtual void StopPicking()
{
if (IsHolding)
{
if (!PickedObj.Equals(null) && PickedObj.Picker == this)
{
PickedObj.OnReleased(this);
}
IsHolding = false;
PickedObj = null;
Debug.Log("Stop picking.");
}
}
/// <summary>
/// This function will be called in FixedUpdate cycle. It calls the pickable object's
/// OnPickedUpdate function.
/// </summary>
protected virtual void PickingFixedUpdate()
{
// Check if PickedObj has been destroyed
if (PickedObj == null || PickedObj.Equals(null))
{
PickedObj = null;
IsHolding = false;
return;
}
if (IsHolding)
{
PickedObj.OnPickedUpdate(this);
}
}
/// <summary>
/// Recursive function used to pick the object in the scene based on the projected near point and far point of the ray corresponding to a mouse click on the screen
/// </summary>
private PickedObj PickRayCast(object SceneGraphNode, Vector3 nearPoint, Vector3 farPoint)
{
if (SceneGraphNode == null)
{
return null;
}
Vector3 Direction = (farPoint - nearPoint);
float MinDistance = -1.0f;
float DistanceOfIntersection;
GeometryNode ClosestGeometryNode = null;
if (SceneGraphNode.GetType() == typeof(GeometryNode))
{
if ((DistanceOfIntersection = RaySphereIntersectionTest((GeometryNode)SceneGraphNode, nearPoint, farPoint)) > 0.0)
{
if (((GeometryNode)SceneGraphNode).BoundingVolume.Center.Length() > 0.0)
{
MinDistance = DistanceOfIntersection;
ClosestGeometryNode = (GeometryNode)SceneGraphNode;
}
}
}
try
{
Type nodeType = SceneGraphNode.GetType();
PropertyInfo[] nodeProperties = nodeType.GetProperties(BindingFlags.Instance | BindingFlags.Public);
foreach (PropertyInfo nodeProperty in nodeProperties)
{
if (nodeProperty.PropertyType.IsGenericType)
{
Type nodePropertyType = nodeProperty.ReflectedType;
IList<GoblinXNA.SceneGraph.Node> NodeCollection;
if (nodePropertyType == typeof(BranchNode) || nodePropertyType == typeof(TransformNode) || nodePropertyType == typeof(GeometryNode) || nodePropertyType == typeof(MarkerNode))
{
NodeCollection = (IList<GoblinXNA.SceneGraph.Node>)nodeProperty.GetValue(SceneGraphNode, null);
PickedObj ChildPickedObj;
foreach (object ChildGraphNode in NodeCollection)
{
ChildPickedObj = PickRayCast(ChildGraphNode, nearPoint, farPoint);
if (ChildPickedObj != null && (MinDistance < 0.0 || ChildPickedObj.DistanceOfRay < MinDistance))
{
MinDistance = ChildPickedObj.DistanceOfRay;
ClosestGeometryNode = ChildPickedObj.PickedNode;
}
}
}
}
}
}
catch (Exception)
{
return null;
}
if (MinDistance > 0.0)
{
PickedObj returnObj = new PickedObj(ClosestGeometryNode, MinDistance);
return returnObj;
}
return null;
}
