public static Matrix LookAt(Vector3f eye, Vector3f target, Vector3f up)
{
Vector3f zaxis = Vector3f.Normalize(target - eye);
Vector3f xaxis = Vector3f.Normalize(Vector3f.Cross(up, zaxis));
Vector3f yaxis = Vector3f.Cross(zaxis, xaxis);
Matrix result = Null;
result.M11 = -xaxis.X;
result.M12 = yaxis.X;
result.M13 = -zaxis.X;
result.M21 = -xaxis.Y;
result.M22 = yaxis.Y;
result.M23 = -zaxis.Y;
result.M31 = -xaxis.Z;
result.M32 = yaxis.Z;
result.M33 = -zaxis.Z;
result.M44 = 1.0f;
return(Matrix.Translation(-eye) * result);
}
public static Vector3f Normalize(Vector3f v)
{
v.Normalize();
return(v);
}