I built this so my AI could find the concentration and location of other units in a way that wouldn't decrease performance.  All the expensive operations are performed on the generation of the heat map grid, so it works well at runtime.    Just like any heat map it does have a limit on the number of nodes you can have before it impacts performance, but fidelity can be lowered to increase performance.  I also just noticed that the top row thinks it is neighbors with the bottom row...I'll work on that.

Features 

- multiple layers for different teams or units.   
-visual output of map to gui
-box renderers can be turned off, making grid invisible
-cumulative heat around each grid point can be accessed to find hottest area


This is just a bare bones demo and the tool is pretty rough still.

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