Yes, Look for Something “Draw to Render target” as I remember. It geht’s you startet-you can Draw heightmaps in the Demo when i’m right. For Out Case - Basically you get the Players positions every Tick and use that as a Material parameter to Draw to a RGB Channel. In the Material you can then use a multi blend and depending in the amount blend in Green, yellow, Red. This should have you the Desiree result in runtime. Next Thing you need to Figuren Out is how you can save that Out of the Game or persist in a Database 
Hope IT helps you
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