/// <summary>
/// Copy constructor.
/// </summary>
/// <param name="from">Another HitTestData object to copy from.</param>
public HitTestPointData(HitTestPointData from)
{
this._hitTransformation = from._hitTransformation;
this._worldTransformation = from._worldTransformation;
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="transformation">The original hit ray matrix. Usually obtained using the mouse coordinates and the camera settings.</param>
public HitTestPointData(Matrix4x4 transformation)
{
_hitTransformation = transformation;
_worldTransformation = Matrix4x3.Identity;
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="hitTransformation">The original hit ray matrix. Usually obtained using the mouse coordinates and the camera settings.</param>
/// <param name="worldTransformation">The original world transformation.</param>
private HitTestPointData(Matrix4x4 hitTransformation, Matrix4x3 worldTransformation)
{
_hitTransformation = hitTransformation;
_worldTransformation = worldTransformation;
}
/// <summary>
/// Determines whether the specified 3D-rectangle r is hit by a ray given by the provided transformation matrix that would transform
/// the hit ray in a ray at x=0, y=0, and z=-Infinity .. +Infinity.
/// </summary>
/// <param name="r">The rectangle r.</param>
/// <param name="rayTransformation">The hit ray transformation.</param>
/// <param name="z">If there was a hit, this is the z coordinate of the hit (otherwise, NaN is returned).</param>
/// <returns>True if the rectangle is hit by a ray given by the provided hit ray matrix.</returns>
public static bool IsRectangleHitByRay(RectangleD3D r, Matrix4x4 rayTransformation, out double z)
{
PointD3D[] vertices = new PointD3D[8];
int i = 0;
foreach (var v in r.Vertices)
vertices[i++] = rayTransformation.Transform(v);
foreach (var ti in r.TriangleIndices)
{
if (HitTestWithAlreadyTransformedPoints(vertices[ti.Item1], vertices[ti.Item2], vertices[ti.Item3], out z) && z >= 0)
return true;
}
z = double.NaN;
return false;
}