as stated above a few times, you can use picking (someone said directX has it, and I know for sure that OpenGL does) or the converting to map co-ordinates.

If it is a true ISO engine, then you can just convert the mouse axis to screen coordinates.

In a perspective engine, you can stil convert it (much harder though) or you can just use picking. I recommend picking personnally. Works well (although it uses an extra frame, atleast under OpenGL)


Beer - the love catalyst
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Thanks for all of your responses! They''ve helped a ton!