cam_pos      = [0.467374, 0.687525, 0.133445]';
cam_dir      = [0.823589, 0.416329, 0.38519]';
cam_up       = [-0.565094, 0.544009, 0.620261]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0647521, 0.968916, -0.908796]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;