Using the Classic Shader I need to get point Cd into opacity. Easy enough with the Use Point Color checkbox for diffuse color (also cool that it's automatically multiplied by the basecolor) but I need to do this with opacity as well. How would go about that? Many thanks!

Hi there.
Use shading layer parameter in order to fetch the point color from SOP when you are in material context.

You could do this with a wrangle:

v@opaccolor = @Cd;

Thanks y'all, works like a charm