/// <summary>
/// Rotates the vector about the given axis with the given angle.
/// </summary>
/// <param name="axis"> Axis of rotation. </param>
/// <param name="angle"> Angle of rotation. </param>
public Vector Rotate(Vector axis, Angle angle)
{
// quaternion method
Quaternion R = new Quaternion();
R.Scalar = (angle/2.0).Cos();
R.Vector = axis.Normalize() * (angle/2.0).Sin();
Quaternion v = new Quaternion(0.0, this);
Quaternion res = R * v * R.T();
return res.Vector;
}
/// <summary>
/// Gets the view vectors for the given view position.
/// </summary>
/// <param name="direction"> A <see cref="ViewDirection"/>./ </param>
/// <param name="centerOut"> The center. </param>
/// <param name="posOut"> The position. </param>
/// <param name="upVecOut"> The up vector. </param>
public void GetDirectionVectors(ViewDirection direction, out Vector centerOut, out Vector posOut, out Vector upVecOut)
{
// _scene.RenderList.ResetBounds();
Bounds bounds = _scene.RenderList.Bounds;
// determine the distance needed to view all renderables
double dist = 0;
if (_scene.RenderList.ActorCount > 0 && bounds.IsSet)
{
dist = bounds.MaxWidth / (fov * 0.5).Tan();
centerOut = bounds.Center;
}
else
{
dist = 1 / (fov * 0.5).Tan();
centerOut = new Vector();
}
Vector travel;
switch (direction)
{
case ViewDirection.Front:
travel = new Vector(0, -1, 0);
upVecOut = new Vector(0, 0, 1);
break;
case ViewDirection.Back:
travel = new Vector(0, 1, 0);
upVecOut = new Vector(0, 0, 1);
break;
case ViewDirection.Left:
travel = new Vector(-1, 0, 0);
upVecOut = new Vector(0, 0, 1);
break;
case ViewDirection.Right:
travel = new Vector(1, 0, 0);
upVecOut = new Vector(0, 0, 1);
break;
case ViewDirection.Top:
travel = new Vector(0, 0, 1);
upVecOut = new Vector(0, 1, 0);
break;
case ViewDirection.Bottom:
travel = new Vector(0, 0, -1);
upVecOut = new Vector(0, 1, 0);
break;
default:
travel = new Vector(1, -1, 0.5);
travel.Normalize();
dist = 0.8 * dist;
upVecOut = new Vector(0, 0, 1);
break;
}
posOut = (travel * dist) + centerOut;
}