I have decided that I want to use a 3D cursor in my game that hovers above the terrain. It will make picking very easy and look cool. But I need to know if the cursor is moved into a certain area that will cause it to be rendered onto the interface panel. Then the player can press buttons on the 2D interface on the side of the screen. I guess it would be the opposite of using the selection mode and name stack in opengl.
Testing if a 3d object is rendered in a certain area in a viewport?
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