cam_pos      = [0.312165, 1.1072, 0.363104]';
cam_dir      = [0.535842, 0.486707, -0.689921]';
cam_up       = [-0.425399, 0.861466, 0.277329]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.969997, -0.1927, -0.88931]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;