Here is my understanding, hopefully someone can correct if I’m wrong on anything…

n = thisComp.layer(“Chin”);
nullpos = n.toComp(n.anchorPoint);
fromComp(nullpos);

EXPLANATION:
The first two lines are just creating variable references:
“n” is referencing the object to follow, in this case the “chin” null object (getting it by name).
“nullpos” uses the “n” (chin reference) to further reference the null object’s anchorpoint

The last line is the one that actually links the null to the pin. The Adobe LiveDocs read like a Voodoo curse so I can only vaguely guess what’s going on here:

“fromComp” transforms a point composition space to layer space. So we’re taking the point from the “pin” in our composition and converting its transform value to the “chin” null layer values.(?)

Something like that :)

Incidentally, if you didn’t want to use the top-left corner of the null object as your reference and wanted to middle of the null instead I’m pretty sure you could substitute this:

nullpos = n.toComp([50,50,0]);

Nulls default to 100×100 in size, so you can offset the null value to be able to use the middle as your target.

Thanks for all the help guys. I’m beginning to understand it a bit more; but without a fairly extensive background in this already – the way it was presented was a bit of a bust for me.

@chris – I always try to stay positive; but it’s difficult giving feedback (which will actually improve future webcasts) without running the risk of, as you say, not “being positive.” What I was softly trying to point out, and still am, was that the presenter could have (and really should have if there was an editor for the process) very easily: slowed down 25%, zoomed in appropriately, had code he wanted in a separate tab, etc.. The way you talk, it sounds like the whole thing has already been recorded and sliced up without regard for presenting “first things first” – a more “see what I’ve done” showcase rather than an educational “this is how to do it” tutorial. “You have to see the last day before you can even understand the first day” sort of doesn’t make sense – does it?

Really it’s an interesting topic, Dan seems to know his stuff well, he has a pleasing speaking voice without annoying and distracting mannerisms, video and audio recording methods seem to have been nailed (except resolution); it’s just the “lesson outline” and delivery that need tweaking. Hopefully with our comments Dan’s next tutorials (and I hope there are some) can come across more clear and understandable because i think there is a lot we can learn from him.