public static Matrix3f createNormalMatrix(Matrix4f viewMatrix, Matrix4f modelMatrix)
{
Matrix3f result;
result = MatrixTransforms.Transpose(MatrixTransforms.Inverse(viewMatrix * modelMatrix)).toMatrix3();
return(result);
}
/// <summary>
/// Map the specified window coordinates (win.x, win.y, win.z) into object coordinates.
/// </summary>
/// <param name="win">The win.</param>
/// <param name="model">The model.</param>
/// <param name="proj">The proj.</param>
/// <param name="viewport">The viewport.</param>
/// <returns></returns>
public static Vector3f unProject(Vector3f win, Matrix4f model, Matrix4f proj, Vector4f viewport)
{
Matrix4f Inverse = MatrixTransforms.Inverse(proj * model);
Vector4f tmp = new Vector4f(win, (1f));
tmp.x = (tmp.x - (viewport[0])) / (viewport[2]);
tmp.y = (tmp.y - (viewport[1])) / (viewport[3]);
tmp = tmp * (2f) - (1f);
Vector4f obj = Inverse * tmp;
obj /= obj.w;
return(new Vector3f(obj));
}