Help with direction of ies files?

JasmineSkunk

I've been trying to get familiar with the different ways to light my scene using iray and have been experimenting with ies files. But I have a small issue. If I want "light" to come from a window on the left wall (for example) the ies file doesn't work. I have found some "downward" ies files and a few "left facing" ones, even some upward (floor) ones but I haven't found any that point "right" and I can't figure out how to adjust the ones I have when the "light" will be coming from something that doesn't or can't be rotated (like a wall or a window). Is there some way to edit the file to change the direction it points? Or is there a parameter in Daz Studio that will rotate the file? Thanks. 

Totte

Lights from IES goes in (minus) Z-direction of the object you emit from (Thats why I created two emitters for my Emission Profile Master product. The reason is that Iray internally uses Z for vertical. 

JasmineSkunk

Hey, thanks for responding, Totte, but I'm not using your product so I'm not sure what you're referencing. I got my ies files from various lighting manufacturers, Like Phillips, GE, American Electric, etc. The question I have is regarding how I might control the direction of these files. I can open them to read them in notepad, but I don't understand what the values mean so I was wondering if there was some way to "turn" them to control the direction they emit

Richard Haseltine

Totte iss aying that the lights are set to shine along the Z axis. You need to rotate the item they are applied to, having created it facing Z forwards (assuming ti is a promitive).

felis

I created a plane with Z forward, but I had to rotate it 180 degree, to get it right.

Edit: which corresponds to the axis orientation in blender.

Richard Haseltine

Sorry, Z backwards was what I should have said

Totte

Richard Haseltine said:

Sorry, Z backwards was what I should have said

Minus Z that is :P 

JasmineSkunk

Ah! I see. Okay, thanks, guys!