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I'm trying to make a realistic prism with Luxcore since yesterday but it's not really working, there's no ray! But I know that the prisme is working because if I put a plane in front of the prism I can see the light on it enter image description here How could I do that ?

Tornado 77
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  • something like this? https://blender.stackexchange.com/questions/1602/light-spectrum-dispersion-effect-in-blender?rq=1 – Luciano Oct 17 '19 at 12:50

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In the World tab you can add a volume to the entire scene. This allows you to create fog which scatters light from your laser and thus makes it visible. You will likely need to adjust the Scattering Scale to the size of your scene, larger values result in stronger scattering.

World volume Denoised preview render

Robert Gützkow
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    Its working but the render is really noisy, I tried your .blend file but it was noisy too, I think I need to render with my GPU but I don't know how https://i.imgur.com/aV1n882.jpg – Tornado 77 Oct 17 '19 at 15:50