> Quote - > Quote - I thought that if you uncheck "visible in raytracing" then ray-traced shadows won't render. > > >  Oddly enough, they do. It seems to affect only things like specular.

Sorry, I don't think this is right. An object that is invisible to raytracing does not cast raytrace shadows.
Here is my evidence... but I'm willing to accept any evidence to the contrary! :O)

Left: Body invisible to raytracing
Centre: Body visible to raytracing
Right: head and neck invisible to raytracing

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)