How would I make a headlight effect

Unity Engine
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1

I am wondering how to go about making a headlight effect. I have a top down racer game that I am using a fast unlit alpha shader on. I am using lightmaps for the terrain shadowing so that it looks nice.

What I want to do though is create a night level, where the headlights reveal the track beneath.

Is there a shader or some technique that I can use to “Add” a whiet gradient shaped like a light beam to a lightmapped terrain and have it reveal the terrain properly.

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2

I’ve been using the built in particle/additive shader for a bunch of fake “glow” effects, which might work for what you’re describing. It kinda gives the illusion of “lighting up” the underlying pixels.