how to set the camera model band in the scripts from Thermal to Visible

Hello,

In a demo in my training, there is a model's default camera model band is always "Thermal". But the pictures are Visible RGB. So how to set the camera model band in the scripts to Visible manually?  it seems that it doesn't work by setting: 

photogroups.getPhotogroup(i_pg).cameraModelBand = 'Visible'

 

Thanks a lot 

Jinlong