#region Using Statements
using System;
#endregion // Using Statements
#region License
//
// This file is part of the ANX.Framework created by the "ANX.Framework developer group".
//
// This file is released under the Ms-PL license.
//
//
//
// Microsoft Public License (Ms-PL)
//
// This license governs use of the accompanying software. If you use the software, you accept this license.
// If you do not accept the license, do not use the software.
//
// 1.Definitions
// The terms "reproduce," "reproduction," "derivative works," and "distribution" have the same meaning
// here as under U.S. copyright law.
// A "contribution" is the original software, or any additions or changes to the software.
// A "contributor" is any person that distributes its contribution under this license.
// "Licensed patents" are a contributor's patent claims that read directly on its contribution.
//
// 2.Grant of Rights
// (A) Copyright Grant- Subject to the terms of this license, including the license conditions and limitations
// in section 3, each contributor grants you a non-exclusive, worldwide, royalty-free copyright license to
// reproduce its contribution, prepare derivative works of its contribution, and distribute its contribution
// or any derivative works that you create.
// (B) Patent Grant- Subject to the terms of this license, including the license conditions and limitations in
// section 3, each contributor grants you a non-exclusive, worldwide, royalty-free license under its licensed
// patents to make, have made, use, sell, offer for sale, import, and/or otherwise dispose of its contribution
// in the software or derivative works of the contribution in the software.
//
// 3.Conditions and Limitations
// (A) No Trademark License- This license does not grant you rights to use any contributors' name, logo, or trademarks.
// (B) If you bring a patent claim against any contributor over patents that you claim are infringed by the software, your
// patent license from such contributor to the software ends automatically.
// (C) If you distribute any portion of the software, you must retain all copyright, patent, trademark, and attribution
// notices that are present in the software.
// (D) If you distribute any portion of the software in source code form, you may do so only under this license by including
// a complete copy of this license with your distribution. If you distribute any portion of the software in compiled or
// object code form, you may only do so under a license that complies with this license.
// (E) The software is licensed "as-is." You bear the risk of using it. The contributors give no express warranties, guarantees,
// or conditions. You may have additional consumer rights under your local laws which this license cannot change. To the
// extent permitted under your local laws, the contributors exclude the implied warranties of merchantability, fitness for a
// particular purpose and non-infringement.
#endregion // License
namespace ANX.Framework
{
public struct Plane : IEquatable<Plane>
{
#region fields
public float D;
public Vector3 Normal;
#endregion
#region constructors
public Plane(float a, float b, float c, float d)
{
this.D = d;
this.Normal = new Vector3(a, b, c);
}
public Plane(Vector3 normal, float d)
{
this.D = d;
this.Normal = normal;
}
public Plane(Vector3 point1, Vector3 point2, Vector3 point3)
{
// calculate 2 vectos spanning the plane and cross them to get the normal, then normalize
this.Normal = Vector3.Normalize(Vector3.Cross(Vector3.Subtract(point2, point1), Vector3.Subtract(point3, point1)));
// now calculate d
this.D = Vector3.Dot(point1, this.Normal);
}
public Plane(Vector4 value)
{
this.D = value.W;
this.Normal = new Vector3(value.X, value.Y, value.Z);
}
#endregion
#region public methods
public float Dot(Vector4 value)
{
float result;
this.Dot(ref value, out result);
return result;
}
public void Dot(ref Vector4 value, out float result)
{
//taken from vektor
result = this.Normal.X * value.X + this.Normal.Y * value.Y + this.Normal.Z * value.Z + this.D * value.W;
}
public float DotCoordinate(Vector3 value)
{
float result;
this.DotCoordinate(ref value, out result);
return result;
}
public void DotCoordinate(ref Vector3 value, out float result)
{
result = this.Normal.X * value.X + this.Normal.Y * value.Y + this.Normal.Z * value.Z + this.D;
}
public float DotNormal(Vector3 value)
{
float result;
this.DotNormal(ref value, out result);
return result;
}
public void DotNormal(ref Vector3 value, out float result)
{
result = this.Normal.X * value.X + this.Normal.Y * value.Y + this.Normal.Z * value.Z ;
}
public override int GetHashCode()
{
return this.D.GetHashCode() ^ this.Normal.GetHashCode();
}
public PlaneIntersectionType Intersects(BoundingBox box)
{
PlaneIntersectionType result;
this.Intersects(ref box, out result);
return result;
}
public void Intersects(ref BoundingBox box, out PlaneIntersectionType result)
{
throw new Exception("method has not yet been implemented");
}
public PlaneIntersectionType Intersects(BoundingFrustum frustum)
{
PlaneIntersectionType result;
this.Intersects(ref frustum, out result);
return result; ;
}
public void Intersects(ref BoundingFrustum frustum, out PlaneIntersectionType result)
{
throw new Exception("method has not yet been implemented");
}
public PlaneIntersectionType Intersects(BoundingSphere sphere)
{
PlaneIntersectionType result;
this.Intersects(ref sphere, out result);
return result;
}
public void Intersects(ref BoundingSphere sphere, out PlaneIntersectionType result)
{
float distanceSquared_Sphere_Origin = Vector3.DistanceSquared(Vector3.Zero, sphere.Center);
float distanceSquared_Plane_Origin = this.D * this.D;
//maybe check pointing direktion of normal
if ((this.Normal * 2).LengthSquared() < this.Normal.LengthSquared())
{
if (distanceSquared_Sphere_Origin > distanceSquared_Plane_Origin)
{
if (distanceSquared_Sphere_Origin - sphere.Radius < distanceSquared_Plane_Origin)
{
result = PlaneIntersectionType.Intersecting;
return;
}
else
{
result = PlaneIntersectionType.Front;
return;
}
}
if (distanceSquared_Sphere_Origin < distanceSquared_Plane_Origin)
{
if (distanceSquared_Sphere_Origin + sphere.Radius > distanceSquared_Plane_Origin)
{
result = PlaneIntersectionType.Intersecting;
return;
}
else
{
result = PlaneIntersectionType.Back;
return;
}
}
}
else
{
if (distanceSquared_Sphere_Origin > distanceSquared_Plane_Origin)
{
if (distanceSquared_Sphere_Origin - sphere.Radius < distanceSquared_Plane_Origin)
{
result = PlaneIntersectionType.Intersecting;
return;
}
else
{
result = PlaneIntersectionType.Back;
return;
}
}
if (distanceSquared_Sphere_Origin < distanceSquared_Plane_Origin)
{
if (distanceSquared_Sphere_Origin + sphere.Radius > distanceSquared_Plane_Origin)
{
result = PlaneIntersectionType.Intersecting;
return;
}
else
{
result = PlaneIntersectionType.Front;
return;
}
}
}
//else distance sphere == distance plane
result = PlaneIntersectionType.Intersecting;
}
public void Normalize()
{
throw new Exception("method has not yet been implemented");
}
public static Plane Normalize(Plane value)
{
Plane result;
Plane.Normalize(ref value, out result);
return result;
}
public static void Normalize(ref Plane value, out Plane result)
{
throw new Exception("method has not yet been implemented");
}
public override string ToString()
{
return "{{Normal:"+this.Normal.ToString()+" D:"+this.D.ToString()+"}}";
}
public static Plane Transform(Plane plane, Matrix matrix)
{
throw new Exception("method has not yet been implemented");
}
public static void Transform(ref Plane plane, ref Matrix matrix, out Plane result)
{
throw new Exception("method has not yet been implemented");
}
public static Plane Transform(Plane plane, Quaternion rotation)
{
throw new Exception("method has not yet been implemented");
}
public static void Transform(ref Plane plane, ref Quaternion rotation, out Plane result)
{
throw new Exception("method has not yet been implemented");
}
#endregion
#region IEquatable implementation
public override bool Equals(Object obj)
{
return (obj is Plane) ? this.Equals((Plane)obj) : false;
}
public bool Equals(Plane other)
{
return this.D == other.D && Normal.Equals(other.Normal);
}
#endregion
#region operator overloading
public static bool operator ==(Plane lhs, Plane rhs)
{
return lhs.D.Equals(rhs.D) && lhs.Normal.Equals(rhs.Normal);
}
public static bool operator !=(Plane lhs, Plane rhs)
{
return !lhs.D.Equals(rhs.D) || !lhs.Normal.Equals(rhs.Normal);
}
#endregion
}
}