Lightformer
Building live envmaps
This component draws flat rectangles, circles or rings, mimicking the look of a light-former. You can set the output intensity, which will effect emissiveness once you put it into an HDRI <Environment>, where it mostly belong. It will act like a real light without the expense, you can have as many as you want.
<Environment>
<Lightformer
form="rect" // circle | ring | rect (optional, default = rect)
intensity={1} // power level (optional = 1)
color="white" // (optional = white)
scale={[10, 5]} // Scale it any way you prefer (optional = [1, 1])
target={[0, 0, 0]} // Target position (optional = undefined)
/>