private BoundingRectangle CalculateScreenSpaceBounds(IGeometry item, View view)
{
//Create a bounding box around this geometry
var box = new BoundingBox(item.BoundingSphere);
box.GetCorners(_corners);
//Multiply box corners by WVP matrix to move into screen space
for (int i = 0; i < _corners.Length; i++)
{
//Why is world matrix Identity?
//THe bounding sphere is already in world space, we don't need to apply it again!
_corners[i] = view.Viewport.Project(_corners[i].ToXNA(), view.Camera.Projection.ToXNA(), view.Camera.View.ToXNA(), Microsoft.Xna.Framework.Matrix.Identity).FromXNA();
_corners2D[i] = _corners[i].XY();
}
//Find a rectangle around this box
var rect = BoundingRectangle.CreateFromPoints(_corners2D);
return rect;
}
private BoundingRectangle CalculateScreenSpaceBounds(IGeometry item, View view)
{
//Create a bounding box around this geometry
var box = new BoundingBox(item.BoundingSphere);
var corners = box.GetCorners();
//Multiply box corners by WVP matrix to move into screen space
for (int i = 0; i < corners.Length; i++)
{
corners[i] = view.Viewport.Project(corners[i].ToXNA(), view.Camera.Projection.ToXNA(), view.Camera.View.ToXNA(), Matrix.Identity).FromXNA();
}
//Find a rectangle around this box
var rect = BoundingRectangle.CreateFromPoints(corners.Select(a => a.XY()));
return rect;
}
public static void AddBoundingBox(BoundingBox box, Color color, float life = 0f)
{
// Get a DebugShape we can use to draw the box
DebugShape shape = GetShapeForLines(12, life);
// Get the corners of the box
box.GetCorners(_corners);
// Fill in the vertices for the bottom of the box
shape.Vertices[0] = new VertexPositionColor(_corners[0].ToXNA(), color);
shape.Vertices[1] = new VertexPositionColor(_corners[1].ToXNA(), color);
shape.Vertices[2] = new VertexPositionColor(_corners[1].ToXNA(), color);
shape.Vertices[3] = new VertexPositionColor(_corners[2].ToXNA(), color);
shape.Vertices[4] = new VertexPositionColor(_corners[2].ToXNA(), color);
shape.Vertices[5] = new VertexPositionColor(_corners[3].ToXNA(), color);
shape.Vertices[6] = new VertexPositionColor(_corners[3].ToXNA(), color);
shape.Vertices[7] = new VertexPositionColor(_corners[0].ToXNA(), color);
// Fill in the vertices for the top of the box
shape.Vertices[8] = new VertexPositionColor(_corners[4].ToXNA(), color);
shape.Vertices[9] = new VertexPositionColor(_corners[5].ToXNA(), color);
shape.Vertices[10] = new VertexPositionColor(_corners[5].ToXNA(), color);
shape.Vertices[11] = new VertexPositionColor(_corners[6].ToXNA(), color);
shape.Vertices[12] = new VertexPositionColor(_corners[6].ToXNA(), color);
shape.Vertices[13] = new VertexPositionColor(_corners[7].ToXNA(), color);
shape.Vertices[14] = new VertexPositionColor(_corners[7].ToXNA(), color);
shape.Vertices[15] = new VertexPositionColor(_corners[4].ToXNA(), color);
// Fill in the vertices for the vertical sides of the box
shape.Vertices[16] = new VertexPositionColor(_corners[0].ToXNA(), color);
shape.Vertices[17] = new VertexPositionColor(_corners[4].ToXNA(), color);
shape.Vertices[18] = new VertexPositionColor(_corners[1].ToXNA(), color);
shape.Vertices[19] = new VertexPositionColor(_corners[5].ToXNA(), color);
shape.Vertices[20] = new VertexPositionColor(_corners[2].ToXNA(), color);
shape.Vertices[21] = new VertexPositionColor(_corners[6].ToXNA(), color);
shape.Vertices[22] = new VertexPositionColor(_corners[3].ToXNA(), color);
shape.Vertices[23] = new VertexPositionColor(_corners[7].ToXNA(), color);
}
/// <summary>
/// Checks whether the current BoundingSphere contains the specified BoundingBox.
/// </summary>
/// <param name="box">The BoundingBox to test for overlap.</param><param name="result">[OutAttribute] Enumeration indicating the extent of overlap.</param>
public void Contains(ref BoundingBox box, out ContainmentType result)
{
//check if all corner is in sphere
bool inside = true;
foreach (Vector3 corner in box.GetCorners())
{
if (Contains(corner) == ContainmentType.Disjoint)
{
inside = false;
break;
}
}
if (inside)
{
result = ContainmentType.Contains;
return;
}
//check if the distance from sphere center to cube face < radius
double dmin = 0;
if (Center.X < box.Min.X)
dmin += (Center.X - box.Min.X) * (Center.X - box.Min.X);
else if (Center.X > box.Max.X)
dmin += (Center.X - box.Max.X) * (Center.X - box.Max.X);
if (Center.Y < box.Min.Y)
dmin += (Center.Y - box.Min.Y) * (Center.Y - box.Min.Y);
else if (Center.Y > box.Max.Y)
dmin += (Center.Y - box.Max.Y) * (Center.Y - box.Max.Y);
if (Center.Z < box.Min.Z)
dmin += (Center.Z - box.Min.Z) * (Center.Z - box.Min.Z);
else if (Center.Z > box.Max.Z)
dmin += (Center.Z - box.Max.Z) * (Center.Z - box.Max.Z);
if (dmin <= Radius * Radius)
{
result = ContainmentType.Intersects;
return;
}
//else disjoint
result = ContainmentType.Disjoint;
}
