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The current method we implement is to prescan the map and know which tiles will appear that high. Then you can mark the tiles above it so they know there is a tile in there that has to be drawn.
Of course there's more to it, but that's the basics of it.
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Jim Adams
Co-Designer 'The Light Befallen'
tcm@pobox.com
http://www.lightbefallen.com
For instance, only scan it when you are drawing your top-most strip of tiles. They hold the variable telling the engine how many tiles down to scan. That's one more variable per tile draw across the top to track, and it's only done once per render.
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Jim Adams
Co-Designer 'The Light Befallen'
tcm@pobox.com
http://www.lightbefallen.com
.For example I'm looking at this field of grass and the very bottom of the screen I will be able to see a mountain top.
Thanks for any help.
I've used a depth sorted tree with great success.
Even though BSP trees are generally associated with polygon based engines, they can be usefull with sprite engines as well (it is essentially the same thing you are trying to accomplish, just with a different 3D->2D mapping, and rasterization technique).
/Niels
