cam_pos      = [0.333504, 1.10979, 0.382527]';
cam_dir      = [0.653936, 0.246087, -0.715408]';
cam_up       = [-0.196921, 0.968391, 0.153107]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.971528, -0.054206, -0.906696]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;