Ray traced rectangle lights with animated textures - how?

[shokomon]

@Suthriel

Ok, that blurry lighting… dunno ^.^ But if you look at this clip here, were they show an interactive demo with the used lights, then you can see, that their floor is quite reflective/metallic, and does reflect a pretty clear and sharp image of the background TV and the car itself (1 minute mark) :

Wow - thanks Suthriel!!

That has to go down as the most helpful answer I have ever received on a forum. To go to the trouble of actually mocking up my setup and then making a movie of it for me to watch…I’m stunned. And your results really do look like the Porsche reference. Amazing effort. I also like your suggestion about pre-blurring an image sequence, I’m going to try that because it’s easy to automate in Nuke and it would mean the soft illumination would be occurring with primary rays, not just reflections and GI, which might help it interact better with more shaders in the scene.

I’m on a work-supplied 2080ti, and I’m rendering stuff non-realtime in the end, so I can afford some higher sample settings.

@rosegoldslugs

Seems to me like it’s a flat plane with the media texture for the emissive. Most of the light coming from it seems to be more specular than diffuse which also suggests it’s a dim emissive compared to a direct light source. Also if you look at the “Light Studio” tool on screen there are only 2 light sources visible: the overhead light and the one that is rotated around to the back.

Also thanks to you rosegoldslugs - I think your analysis is accurate and is in line with Suthriel’s demo. I might also cook up a custom bloom kurnel, because looking closely at the Porsche light studio, some of what looks like illumination from the video wall is actually light wrap from the bloom.

Thanks heaps to the 2 of you - I’m looking forward to trying it all out at work today!