"Up Scroller" and "Down Scroller" explanation

[begrimed]

This conversation just happened on IRC, which explained something a lot of people probably haven't used at all in their hacks (myself included), but is a very useful and underappreciated feature. In SMILE's room properties, there are two values, Up Scroller and Down Scroller. Here's the conversation:

<Scyzer> the scrolling limits dont really adjust a room's scroll limits absolutely
<Scyzer> it's just how far the camera will scroll up or down, relative to samus when she is moving up or down
<Scyzer> like, if samus is moving up, the camera will move further up so you can see above you.
<Scyzer> the Scroll Up value is how far it goes up
<Scyzer> and the same thing with going down, but just with the down value
<Scyzer> setting them both to 00 means samus has to be right on the edge of the screen for it to move, which in the attic, cannot happen, so the screen just stays put
<Scyzer> if samus were to be able to reach the very top of the screen, it would scroll up as it should with green scrolls.
<Scyzer> 70 and A0 are just the basic values for most rooms, but other rooms randomly use 90 instead of 70. it doesn't really make too much difference though. crateria WS lake and the little lake before it are two of those rooms
<PJBoy> to make the grapple ceilings more obvious
<PJBoy> I'm surprised they even thought to write that
<Grime> That's very cool.
<Scyzer> actually yeh that does make more sense
<Grime> Such an underapprciated little feature.
<Scyzer> doesnt explain the morph maze room though :P
<PJBoy> morph maze?
<PJBoy> oh that stupid room
<PJBoy> I've been in that room like
<PJBoy> twice
<Scyzer> also in the room before xray, so yeh I think you're very right
<PJBoy> ever
<Scyzer> anything with grapples on the cieling seems to have it
<Scyzer> (and that one room with the ripper after croc)

Here's how it looks ingame. You probably shouldn't use anything higher than B0.

[passarbye]

you know I was hoping this would be possible because i never really cared for how the 'camera' acted sometimes.

thanks for the info!

[Quietus]

Yeah, it's pretty neat, and I suspect it's one of those tricks that almost all hacks could use in at least some places.

[begrimed]

Yeah, too many times I've had a door on the top screen of a room (not a ceiling door) and wished I could have the ceiling totally visible while you were standing in front of the door. 9A is the ideal value to use in that situation if the door is centered like they all are in the original game. The camera won't jerk down at all when you jump, even if you jump all the way to the ceiling with springball and land again without unmorphing.

I've almost gone as far as using scroll PLMs to fix this little annoyance, lol.

Higher values aren't advisable because the camera will start to noticably adjust itself as you get closer to the top screen. It happened a little bit with B0.

Also, this is why the Wrecked Ship attic (room 7CA52) can have all green scrolls in a 1-screen-tall corridor, but not have the camera follow you up and down when you jump around. It has the up and down scrollers to 00.