cam_pos      = [-0.329343, 2.04589, -0.203041]';
cam_dir      = [0.685308, -0.218105, 0.694826]';
cam_up       = [-0.0314028, 0.944362, 0.327406]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.967676, 0.327438, -0.851639]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;