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Help with direction of ies files?

JasmineSkunkJasmineSkunk Posts: 1,906
in The Commons

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. smiley

Comments

  • TotteTotte Posts: 14,098

    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. 

  • JasmineSkunkJasmineSkunk Posts: 1,906
    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 HaseltineRichard Haseltine Posts: 102,770

    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).

  • felisfelis Posts: 4,683
    edited January 2024

    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.

    IES_Z_negative.png
    1200 x 1200 - 412K
    Post edited by felis on
  • Richard HaseltineRichard Haseltine Posts: 102,770

    Sorry, Z backwards was what I should have said

  • TotteTotte Posts: 14,098

    Richard Haseltine said:

    Sorry, Z backwards was what I should have said

    Minus Z that is :P 

  • JasmineSkunkJasmineSkunk Posts: 1,906

    Ah! I see. Okay, thanks, guys! smileyheart

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