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How do I make an object visible based on the light it's recieving

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Mahmoud Shokeir
How do I make an object visible based on the light it's recieving
on Oct 22, 2019 at 11:09:29 am

So I have a car that isn't lighting up properly, despite being directly beneath a spotlight, due to the fact that (as I've been told) the scene is too dark for the car to reflect anything. I added a sphere around the car, added a luminance map to the sphere and set it just enough so we can see the color of the car without it being too bright to compromise the spotlight's intensity. That worked nicely, but that also meant that it is no longer affected by the spotlight, so can I somehow make the sphere only appear in the light? A way I thought of doing this is to link the transparency (of the sphere's material) to be relative to the amount of light hitting the sphere but I don't know how to do that.

If you have any easier suggestions for what I want to do, please let me know.

Thanks


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