Grey background

Hi, I wanted to fit my rhino model to the perspective of a picture, but there is a gray background, which I can’t turn off. as soon as I tilt the model, the gray surface covers the picture I chose as background picture, to match the perspective. How can I get rid of this gray surface?

That is probably the ground plane. You can turn it of using the -_GroundPlane command (or just GroundPlane to get the panel).

A quick macro:

-_GroundPlane _Options _On=No _Enter