Hi Mike - the way things work is mostly that MoI just pushes a whole lot of polygons over to the video card and then it is the video card's job to display it and it's the thing that actually handles visibility determination.
It's not easy to do things conditionally depending on that information - it is possible to a certain extent to do that by utilizing programmable shaders, but trying to make elaborate shaders can be bad for performance itself and also once I start to go down that path it would make MoI only run on relatively newer video cards and not everywhere like it currently does.
- Michael
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