Heat Map for VR

Hi guys, I tried creating a heat map for my VR project following few tutorials on the internet but they doesn’t suit my needs. I tried using render target but I can’t use render target because using it on many actors will be complex and the level won’t good as the render target material has only emissive node enabled. Later I tried storing the location of the actor seen by the player n the time duration in a text file and reading it back into UE4 and feeding it to a camera but is there any simple way to represent the heat map in our levels. Any help is much appreciated ?

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