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Theo Hodkin avatar image
Theo Hodkin asked ·

"Syntax error, unexpected IESNA (...) Expecting TILT" error when loading IES files. (Arnold 5, MtoA 2.0.1.1)

I've set up a basic scene in Maya with a Photometric Light. When loading an IES file in the Photometry slot, I get the following error:

// Error: [ies] (C:/Users/<FILE DIRECTORY>) syntax error, unexpected IESNA:<LM-63-2002>, expecting TILT

Any ideas on what might be happening here? The error occurs when using any IES file (even ones from the providers mentioned in the MtoA Support documentation).

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Stephen Blair avatar image
Stephen Blair answered ·

From https://support.solidangle.com/display/AFMUG/Ai+Photometric+Light

IES file not working

Many IES files originate from various lighting manufacturers, some of whom put extra text at the beginning of their IES files. If you are experiencing difficulties rendering a particular IES file, try opening the IES file in a text editor and deleting the header text from the top of the file. The file should typically start with TILT=NONE and if it doesn't, that may be the culprit.

Delete everything before TILT=NONE

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