mouse clicking on a 3D grid

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Dock

My game takes place on a 10x10 grid of tiles, presented in full 3D with a moving camera.

Is there any easy way to recognise the co-ordinates of the mouse pointer relative to a particular plane? I would like to be able to click on the different tiles on the screen.

I suspect it involves projecting a line from the camera, but I have no idea how to do this. o_o; Can anyone help?

Thanks!