Maya IES octane light setup, how is it done? Tweet

[neuro]

Apologies if this is documented somewhere but I haven't been able to find a clear explanation of how IES files plug into Octane. I tried using an OctaneTextureEmission plugged into an octane diffuse shader but wasn't clear on if it was working. The documentation seems to imply that I need to add a projection node to the projection field, but I'm not sure which one to use and if I do that, will the maya top level transform on the geo that the shader is applied to be used or do you transform the IES some other way?

thanks!

[neuro]

Is there another forum that might attract more people familiar with this topic? To some degree id just like to make a spotlight and it seems like IES lights are the main way to do this. I don't think I can use standard maya lights.

Thanks for any insight!

[bepeg4d]

Hi,
unfortunately I am not a Maya user so I can't share a scene with you in this format, but I have created a simple scene in Standalone and exported the material via orbex. In theory you should be able to import at least the material in Maya or just open the scene in Standalone to see how the IES setup is made
The trick is to load the IES file in the distribution node of both blackbodt and texture emission and use a spherical projection to control the orientation of the light.
her is the ocs:
http://www.beppegullotta.it/test/IES-Light.orbx.zip
and here the material in orbx format:
http://www.beppegullotta.it/test/IES-Light-mat.orbx.zip
ciao beppe

[neuro]

That was a big help. I sort of have it working in Maya based on your scene and description... The IES is definitely projecting now with the spherical projection. It's also respecting the source plane's position. However, the rotation is ignored. I tried adding an input transform on the spherical projection - connecting the rotation of the source plane transform to a rotation transform plugged into the spherical projection, but I couldn't get it to track properly. I've noticed a couple other threads on this forum asking about this but no answers. I tried multiple axis orders, but nothing quite worked right. Maybe something is broken in the maya plugin?

Thanks again bepeg4d!