Light viewable by second camera

its a material updating live from a 2d capture. ive used it as an emissive but because there is very little light on the scene it barely shows any detail.

Basically I’ve created a minimap widget, that on a button press it displays an image (the material live updated from the 2d capture) then on release it removes from view.

I tried creating a second streaming level but I couldn’t get it to work, also it would create double the information in the game i really need.