/// <summary>
/// Extract the far plane from a model-view-projection matrix.
/// </summary>
/// <param name="mvp">
/// The <see cref="Matrix4x4f"/> that specify the matrix used for drawing the clipped object.
/// </param>
/// <returns>
/// It returns a <see cref="Planef"/> defining the far clipping plane.
/// </returns>
public static Planef GetFrustumFarPlane(Matrix4x4f mvp)
{
Planef plane = NormalizePlane(mvp.Row3 - mvp.Row2);
plane.Distance = -plane.Distance;
return(plane);
}
/// <summary>
/// Extract all six planes from a model-view-projection matrix.
/// </summary>
/// <param name="mvp">
/// The <see cref="Matrix4x4f"/> that specify the matrix used for drawing the clipped object.
/// </param>
/// <returns>
/// It returns a <see cref="IEnumerable{Planef}"/> containing all six clipping planes defined
/// by <paramref name="mvp"/>.
/// </returns>
public static IEnumerable <Planef> GetFrustumPlanes(Matrix4x4f mvp)
{
return(new List <Planef>(6)
{
GetFrustumLeftPlane(mvp),
GetFrustumRightPlane(mvp),
GetFrustumNearPlane(mvp),
GetFrustumFarPlane(mvp),
GetFrustumBottomPlane(mvp),
GetFrustumTopPlane(mvp)
});
}
/// <summary>
/// Extract the top plane from a model-view-projection matrix.
/// </summary>
/// <param name="mvp">
/// The <see cref="Matrix4x4f"/> that specify the matrix used for drawing the clipped object.
/// </param>
/// <returns>
/// It returns a <see cref="Planef"/> defining the top clipping plane.
/// </returns>
public static Planef GetFrustumTopPlane(Matrix4x4f mvp)
{
return(NormalizePlane(mvp.Row0 - mvp.Row1));
}
/// <summary>
/// Extract the bottom plane from a model-view-projection matrix.
/// </summary>
/// <param name="mvp">
/// The <see cref="Matrix4x4f"/> that specify the matrix used for drawing the clipped object.
/// </param>
/// <returns>
/// It returns a <see cref="Planef"/> defining the bottom clipping plane.
/// </returns>
public static Planef GetFrustumBottomPlane(Matrix4x4f mvp)
{
return(NormalizePlane(mvp.Row0 + mvp.Row1));
}
/// <summary>
/// Extract the right plane from a model-view-projection matrix.
/// </summary>
/// <param name="mvp">
/// The <see cref="Matrix4x4f"/> that specify the matrix used for drawing the clipped object.
/// </param>
/// <returns>
/// It returns a <see cref="Planef"/> defining the right clipping plane.
/// </returns>
public static Planef GetFrustumRightPlane(Matrix4x4f mvp)
{
return(NormalizePlane(mvp.Row3 - mvp.Row0));
}
