I set panorama image into skybox and I place object onto panorama image.
I found that the scale is 1m in real world is 10 unit in Unity3D at the skybox.
At first I think the 10 value would depend on panorama image (or camera focal length). So I checked other images.
However, the scale value is surprisingly same.
I think all scale is same as 10 in any panorama image.
I want to know the background this for having conviction.