/// <summary>
/// Calculates the view matrix.
/// </summary>
/// <param name="position">The position.</param>
/// <param name="direction">The direction.</param>
/// <param name="up">The up direction.</param>
/// <returns>The calculated view matrix.</returns>
public static Matrix CalculateViewMatrix(Vector3 position, Vector3 direction, Vector3 up)
{
var n = -direction.Normalized();
var u = up.Cross(n).Normalized();
var v = n.Cross(u);
var e = -position;
return new Matrix(
u.X, u.Y, u.Z, u.Dot(e),
v.X, v.Y, v.Z, v.Dot(e),
n.X, n.Y, n.Z, n.Dot(e),
0, 0, 0, 1);
}
