cam_pos      = [0.0810547, 1.27279, 0.786043]';
cam_dir      = [0.676242, 0.142213, -0.722822]';
cam_up       = [-0.735099, 0.0660257, -0.674737]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.0641482, -1.31355, -0.198423]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;