OTOY Forums

Hello,

About IES files, I understand that the rotation needs to be defined in octane and I find it quite an elegant solution, as you can see in the render the light on the walls which have a asymmetric disposition can't get the rotation from the geometry as a face only has a vector of direction and any rotation around that vector can't be transmitted in an obj...

BUT with a symmetrical distribution (around an axis, such as an ordinary halogen spot) it's infinitely simpler to get the orientation from the face normal.
As in this case, in which I have plenty of adjustable spots around the house, now I need to set each spot to a specific material, extract in the modeler the direction and modify it in octane by hand. It's crazy.

Is there a way to get the face normal as the 0,0,0 direction? please?

The face normal varies over the surface of the emitter. If it's used to sample the distribution, the distribution will be blurred because of this variation. It would only work on flat emitters.

At the moment Octane doesn't have a concept of separate objects, so there is no way to set a different reference direction for each lamp.

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Roeland

So basically you're saying I cannot use rotating spots in the models, only fixed spots on walls that have to have a different material for each orientation, only because in octane the initial vector is 0,0,1 instead of the face normal?

Once again a reason that blocks me from using octane for this project. (It's the clients decision to use these type of fixtures all around the house and I simply don't have the time to extract each direction and set up a different material for each spot).

Yup, orienting IES lights would be much easier if Octane would treat the face normal of the emitting plane as the starting direction.

I see the problem when making a scene like the one of vimaxus. We can probably solve this when instancing gets done.

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Roeland

Thank you very much, and good luck on getting the instancing right on the first try. A lot of us need it.