Like I said earlier (phrased differently), using a view frustum system with screen <-> world translations you achieve the ability for plotting heatmaps on a image. The image represents the screen of the view frustum. Such systems are how Halo is able to render friendly indicators or nav points on your screen.
The only software I have installed is Maya (actually I think I uninstalled it to free disk space a while back) and Blender
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