Proper workflow for "unbiased" IES?

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studio3lhd
Licensed Customer
Posts: 24
Joined: Thu Oct 10, 2013 1:19 pm

Can anyone shed some light on proper practices in using IES?

Where should the texture go exactly to produce realistic results? Should the IES be plugged only in the distribution? What's the proper gamma for an IES texture?
The trick is to achieve results as close to reality as possible. Anyone can tweak stuff manually, but I guess that there are "real" numbers, Octane being unbiased and all..
Octane for Modo (v 2.22.2.68), Modo (801 sp4);
2 x TITAN Black,
I7, 32GB RAM.
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face_off
Octane Plugin Developer
Posts: 15714
Joined: Fri May 25, 2012 10:52 am
Location: Adelaide, Australia

Plug the IES file into the distribution with a Grayscale Image node. Set the gamma to 1.0. Use a Spherical projection, and if you set the Coordinate Space to Normal, the light will travel in the direction of the emitter polygon normal. Octane 2.15 allows ticking Surface Brightness, which I think will calibrate the Power to 1 W/srm2.

Paul
Win7/Win10/Mavericks/Mint 17 - GTX550Ti/GT640M
Octane Plugin Support : Poser, ArchiCAD, Revit, Inventor, AutoCAD, Rhino, Modo, Nuke
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