cam_pos      = [0.272146, 1.77663, 0.846231]';
cam_dir      = [-0.945663, -0.202805, 0.25415]';
cam_up       = [-0.324647, 0.545529, -0.772659]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0240109, 1.08153, 0.773697]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;