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Advice on a 3D RTS

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Before I venture into my first 3D OpenGL RTS game, anyone have any advice on it? I''ve written a 2D RTS before using isometrics, but I''m not sure how to go about the engine for a 3D game. Any ideas or tips?

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Very first thing you get is the terrain engine. I''ll assume you are working outdoors, for something along the lines of BattleZone, although the principles are the same for Earth:2140 and Metal Fatigue.

Anyways, you want the terrain engine. You also want subroutines for detecting the 3D world position that is at a 2D screen location, so that the player can "click" with the mouse or targetting reticle, and not have an annoying "fixed-position targetting cursor that is 20 meters in front of your vehicle".

Next, you want to have the non-terrain renderer up. The usual dynamically-added buildings and units are the same, but you will want to make the building models with a "base" extension, a bit of wall to extent below their "bottom", so that you can build them on slightly uneven ground.

Lastly, everything else is the same. Collision detection needs only a bit of revamping, which can be easily enough handled by any level of programmer.

I hope this helps.

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