cam_pos      = [-0.679772, 1.36287, 0.19872]';
cam_dir      = [0.544682, 0.105432, 0.831989]';
cam_up       = [0.548059, 0.706166, -0.448288]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.844265, -0.931203, -0.434714]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;