Just getting used to Rhino 8 - mac. Big change in menues so some getting used to. We make scale models and often render the models enclosed in a glass cover. Before the colours of the model stayed the same but now in Rhino 8 as soon as I add the glass cover the model becomes very dark. Not sure why, any ideas…
I think you may be in the Rendered display mode and not actually rendering with the Render command or in the Raytraced display mode. You should also open the Rendering panel with the Rendering command and use the Reset to Defaults button at the bottom. Also make sure to use the Glass material for glass.