Sun with "physical lights"

Post by **OnoSendai** » Fri Nov 16, 2007 1:17 am

Yes, if you scale the scene down, all the surfaces are closer to the light, and hence brighter. It's expected behaviour.

bkircher · Post by **bkircher** » Wed Nov 21, 2007 7:17 am

Made some new tests, things do look all right.

- The Maya-Converter seems to work better now.
- My efficacy for the fluorescent tube I was using was too low by half.
- Didn't use much turbidity, increased that.

One Questions: Does Indigo scale IES-intensity with the Geometry somehow? (It seems it does, judging from a test I did)

bkircher · Post by **bkircher** » Thu Nov 29, 2007 9:49 pm

found some time to re-check light scaling...
I tested with (accidentially) turning reinhard tonemapping on.

... so the ies-lights are not scaling with the geometry!

As a P.S.:
Is it possible to map turbidity at some time to the Sun-environment ?
It's possible in Mental Ray, and though I like the studies with perlin noise a lot and I'd like a more reproducible and manipulable mechanism.

CTZn · Post by **CTZn** » Fri Nov 30, 2007 5:09 am

Isn't that fine if the IES is not scalable ? That means it is designed for a real scale usage, being the representation of a real object. Sounds ok to me

bkircher · Post by **bkircher** » Fri Nov 30, 2007 6:37 am

exactly, yet I was so dumbfounded with the apparent lack of real-world scenes that I suspected it could be related to some weird scaling issue.

Kram1032 · Post by **Kram1032** » Fri Nov 30, 2007 7:51 am

IES behave just like efficacy-scaled lights, with the two differences that there is no way to vary the power inside Indigo and the power isn't emitted uniformly over the mesh

so, the area of the mesh is important, as the overall energy amount remains equal, but the area, it is emitted over, doesn't

Sun with "physical lights"

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