At their origin? How so, when you can just keep calculating and you don't get exceptions, just more and more NaNs? Edit to add: like, if the error is "distance

At their origin? How so, when you can just keep calculating and you don't get exceptions, just more and more NaNs? Edit to add: like, if the error is "distance was zero so I couldn't invert the matrix", I want that to be the error feedback; not "the screen is black because the final result of all the camera calculations was NaN".