​Light Path Expression (LPE)  Script and UI

Problem

Setting up LPE per shot is a slow and tedious process.

Solution

Create a User Interface that will easily create AOV for each light group.

How To Use

  • In your light's shape, define a custom name to create a light group. (Arnold > Visibility > AOV Light Group)
  • Next, run the script LPE Script. The script should pop up on the right side.
  • Select which AOVs are needed in the shot.
  • The script will create the proper AOVs for each light group found in the scene.
  • Render and import files into Nuke. I used an AOV Splitter (source link) to quickly organize and merge all the shuffles together.
Many credits to Arvid Schneider.