public static bool Intersects(ref ProjectionRectangle rect, ref ViewClipShape shape)
{
int min, max;
Project(rect.Axis[0], shape, out min, out max);
if (rect.MinimumAxis[0] > max || rect.MaximumAxis[0] < min)
{
return(false);
}
Project(rect.Axis[1], shape, out min, out max);
if (rect.MinimumAxis[1] > max || rect.MaximumAxis[1] < min)
{
return(false);
}
for (int i = 0; i < shape.Count; i++)
{
Project(shape.GetAxis(i), rect, out min, out max);
if (shape.GetMinimumScalar(i) > max ||
shape.GetMaximumScalar(i) < min)
{
return(false);
}
}
return(true);
}
internal void Update(GameTime gameTime, ICamera Camera)
{
ViewFrustrum.Matrix = Camera.ViewProjection;
CameraPosition = Camera.Position;
//Corners 0-3 = near plane clockwise, Corners 4-7 = far plane clockwise
ViewFrustrum.GetCorners(VFCorners);
var clip = ClippingFrustrum.FromFrustrumCorners(VFCorners, CameraPosition);
ClipShape = clip.ProjectToTargetY(_position.Y);
_lastCameraPosition = _cameraPosition;
IndexCount = 0;
_rootNode.Merge();
_rootNode.EnforceMinimumDepth();
_activeNode = _rootNode.DeepestNodeWithPoint(ClipShape.ViewPoint);
if (_activeNode != null)
{
_activeNode.Split();
}
_rootNode.SetActiveVertices();
_buffers.UpdateIndexBuffer(Indices, IndexCount);
_buffers.SwapBuffer();
}
internal void Update(GameTime gameTime, ICamera Camera)
{
ViewFrustrum.Matrix = Camera.ViewProjection;
CameraPosition = Camera.Position;
//Corners 0-3 = near plane clockwise, Corners 4-7 = far plane clockwise
ViewFrustrum.GetCorners(VFCorners);
var clip = ClippingFrustrum.FromFrustrumCorners(VFCorners, CameraPosition);
ClipShape = clip.ProjectToTargetY(_position.Y);
_lastCameraPosition = _cameraPosition;
IndexCount = 0;
_rootNode.Merge();
_rootNode.EnforceMinimumDepth();
_activeNode = _rootNode.DeepestNodeWithPoint(ClipShape.ViewPoint);
if (_activeNode != null)
{
_activeNode.Split();
}
_rootNode.SetActiveVertices();
_buffers.UpdateIndexBuffer(Indices, IndexCount);
_buffers.SwapBuffer();
}
private void AddCameraPosition(ref ViewClipShape inputShape)
{
var cam = new Vector2(CameraPosition.X, CameraPosition.Z);
var closest = 0;
var closeDist = Vector2.Distance(cam, inputShape.Point1);
//find closest point
for (var i = 1; i < inputShape.Count; i++)
{
var dist = Vector2.Distance(cam, inputShape[i]);
if (dist <= closeDist)
closest = i;
}
//Find the adjacent points
int adj1, adj2;
if (closest == 0)
{
adj1 = inputShape.Count - 1;
adj2 = closest + 1;
}
else if (closest == inputShape.Count - 1)
{
adj1 = closest - 1;
adj2 = 0;
}
else
{
adj1 = closest - 1;
adj2 = closest + 1;
}
var angle1 = Utils.LineAngle(inputShape[closest] - cam, inputShape[adj1] - cam);
var angle2 = Utils.LineAngle(inputShape[closest] - cam, inputShape[adj2] - cam);
if (angle1 < 90 && angle2 < 90)
{
//point will be inside the shape, replace it with camera position
inputShape.ReplacePoint(closest, cam);
}
else
{
//use the angles to determine what points it is between
if (angle1 >= 90)
{
inputShape.InsertPointAt(closest, cam);
}
else
{
inputShape.InsertPointAt(adj2, cam);
}
}
}
internal static void Project(Vector2 axis, ref ViewClipShape shape, out int min, out int max)
{
min = GenerateScalar(shape.Point1, ref axis);
max = min;
var current = GenerateScalar(shape.Point2, ref axis);
if (current <= min)
min = current;
else
if (current > max)
max = current;
current = GenerateScalar(shape.Point3, ref axis);
if (current <= min)
min = current;
else
if (current > max)
max = current;
if (shape.Count < 4) return;
current = GenerateScalar(shape.Point4, ref axis);
if (current <= min)
min = current;
else if (current > max)
max = current;
if (shape.Count < 5) return;
current = GenerateScalar(shape.Point5, ref axis);
if (current <= min)
min = current;
else if (current > max)
max = current;
if (shape.Count < 6) return;
current = GenerateScalar(shape.Point6, ref axis);
if (current <= min)
min = current;
else if (current > max)
max = current;
}
internal static bool Intersects(ref Rectangle shape1, ref ViewClipShape shape2)
{
int min, max;
//Check against rectangle axis
Project(shape1.Axis1, ref shape2, out min, out max);
if (shape1.A1Min > max || shape1.A1Max < min)
return false;
Project(shape1.Axis2, ref shape2, out min, out max);
if (shape1.A2Min > max || shape1.A2Max < min)
return false;
//Check against the viewclipshape axis - thre are at least 3
for (var i = 0; i < shape2.Count; i++)
{
Project(shape2.GetAxis(i), ref shape1, out min, out max);
if (shape2.GetMinScalar(i) > max || shape2.GetMaxScalar(i) < min)
return false;
}
return true;
}
public bool Intersects(ViewClipShape shape)
{
return Intersection.Intersects(ref this, ref shape);
}
