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Coordinates on heightmap

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I''m working on a RTS (Karantania). I know. It''s a big project... but why not. So here is the problem: I have a world made with heightmap (like in GameTutorials.com). And (when I click) I would like to get the coordinates on that terrain. You know, when you send your unit to a location, you need to get the coordinates on the terrain and not somewhere on the air or screen. If anyone had the same problem, I would be glad if he could help me. Any code or perhaps pseudo code. thanks

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I think I''ll gonna make it. I''ve got some assist from one of the Arxel Tribe programmers.

And when I just mention them... does everyone of you know them? I bet you don''t know where they work (one of the answers is France. But where else?).




Sorry about my english.

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I was wondering how you finally figured out how to do it, I''ve been having the same problem since I would like the actual location on a single polygon for my landscape/height map program... if you can get working results I would be very thankful to see how you completed it.
-thanks

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