How do you turn off "Physical Sky" background on a Arnold render so it is transparent?

[jeff_swann]

Need the Physical Sky lighting effect influence on assets, but not the actual background image in an Arnold Render.  Is there a button somewhere where you can turn off background like in Maya?

[CiroCardoso3v]

Open the render settings, go to the Environment, Background and Atmosphere section

In the Background Backplate you have several options.

[jeff_swann]

Thanks for your response, but I still get a background with background (BG) = NONE in Arnold Environment settings - see image.  Also, Arnold Render View and actually rendering out frames gets the same BG in all.  About to switch to HDRI lights to get alpha again as PNG rather than Physical Sky dome.

[CiroCardoso3v · Accepted solution]

Are you using a Skydome light for the Physical Skydome? If so, you need to untick this option called Light Shape Visible

[jeff_swann]

Outstanding solution - knew an Expert could quickly solve my beginner problem - THANKS!!  Thought this tick-box was just for viewports.