editor light ???

Masterstroke

Is it possible to have a light source to enlight your scene, that is only active in preview mode. The problem: when I use IRAy and I use mesh lights only, my shader view editor is black.

Richard Haseltine

Turn off Preview Lights - cmd/ctrl L by default, it's in the Window menu too - and you will get a basic light that doesn't render. You cana lso swithc the preview to use Photoreal mode, instead of Interactive, in the Draw Settings pane - but that is obviously more taxing for the system.