Hi to all
Ok, I knew that after pulling my hair for four hours, at the moment I post to the forum I’ll understand it. So I got that dim, srcdim etc. are all properties which simply need to be set and it works.
But – still looking for the reference if it exists, as I’m sure there are more methods such as "frommatrix" which I discovered in one of the example patches – it would be great to have an overview of these.