To setup Image Based Lighting for a scene, select the “Set lighting to Image Based Light” option from the “Additional Options” popup in the Settings tab.
Then to select an image (ie. a lightprobe image) to illuminate the scene, select the “texture” node from the “environment” pin in the Settings tree of the plugin. Then click the image button in the Node Parameters box. Then select the HDRIAn image which presents more than 8 bit per color channel unlike most common image formats. you wish to use to illuminate the scene.
Once the new image map is loaded, open the Viewport and adjust the scene lighting levels by changing the “power” slider in the “environment” node. Once you have the right light level, it is recommended that you export the rendertarget so that if you need to re-use that image in the future, you can simply import the rendertarget rather than selecting the image and finding the right power levels again. To do this, select “Export Rendertarget Settings” from the “Additional Options” popup.
NOTE: Octane currently supports lat/long HDRI maps.
IBL Rotation
To rotate the IBL image in the scene (assigned to the “Texture” pin of the Daylight or Texture Environment node), change the “Texture” -> “Projection” pin Node Type to Spherical, and then move the Y slider in the “Texture” -> “Projection” -> “Sphere transformation” -> “Scale” node.