During my testing with wikitude sample project, the overlay may come and go within mini seconds if the target is not exactly the same as the tracking object,but in reality even it only have 70% of similarity,I'd like to keep the overlay on the screen. Is there a workaround to that? Is there a radius that can be adjusted? Or to put it another way, is it possible to keep the overlay on the screen once it's rendered, let the user to close it manually? Thanks!