cam_pos      = [-1.24435, 1.46343, 0.582765]';
cam_dir      = [0.487349, 0.0154176, 0.873071]';
cam_up       = [0.1464, 0.984249, -0.0991012]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.14493, -0.234232, -0.634962]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;