There is something that has mystified me for a while that I hope somebody 
can clear up for me. I'm sure it's just because there's something 
fundamental I haven't grasped yet.

The subject is crawling text in a title. When I create a long crawling 
title -- say, a list of credits -- I generally want it to start off-screen 
and to end off-screen.

So far, so good, that's easy to specify.

I am also aware that the duration of the title affects the speed of the 
crawl, and indeed that works as expected.

But there's one thing that does NOT work as I expected, and I can't figure 
out why.

What I expect is that as soon as the title starts, you begin to see the text 
crawl in from the side. Then, over the duration of the title, the text 
crawls. Then, just as the last of the text crawls out the other side, the 
title is over.

That is indeed what happens for the text crawling OUT. But for the text 
crawling IN, that does not seem to be what happens.

I find that in some cases the title can go for as much of a third of its 
duration before any text starts crawling in. That's the mystery for me: why? 
What is it that controls when the text actually starts crawling in?

I tried all the things in the roll/crawl box, but they seem to be different 
parameters not affecting this.

There is exactly one thing I have found that seems to have some influence, 
maybe, on when the text starts crawling in: that long text has to be 
"parked" somewhere, and it seems like it may depend on where you position it 
along the screen. For example, if it is a very long text (which is will 
inevitably be), it seems like it might make a difference if I position, say, 
the beginning of the text in the middle of the screen, or the middle of the 
text in the middle of the screen, or the end of the text in the middle of 
the screen. Indeed it does seem to make some kind of difference as to when 
the text starts marching in from the side. But it seems also like a kind of 
arbitrary way to control it.

So my question to anybody who might be interested in enlightening me on this 
is: What is it that controls when the text enters from the side; what 
fundamental principle have I perhaps missed that is key to understanding it?

Thanks!

John



 
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