cam_pos      = [-0.471378, 1.42991, 1.32366]';
cam_dir      = [0.95866, 0.0725545, 0.275149]';
cam_up       = [-0.0833755, 0.99613, 0.0278215]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.361848, 0.065984, -1.27813]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;