Ummm, isn't there a contradiction here?

One says that IBL with IDL will be occluded.
One says that IBL with IDL will not be occluded.

What I thought I had learnt is that IBL with IDL does not work as IBL at all, but as ambient light emitted from a virtual all-enclosing sphere. So it will be occluded.

(edit) oops, cross-post, never mind!

"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)