Background scrolling effect on y axis.

GLGAMES

Hi guys,
since my first game is waiting for review, i'm planning to finish up my 2nd game which is a platform jumping game. I am trying to make the background scroll seamlessly on y axis. Can someone point out an example for me? I remember seeing it somewhere using interpolate and 2 similar backgrounds put side by side but cannot find that post anymore.

mangaroo

Parallax Scrolling. I can't do it (personally) with move - i only managed it on my running template (marketplace) with Spawn and Destroy:

BG RULE:

when attribute self.position.y > 0
-> Spawn Actor (BG)
x position = self.position.x & y position (relative to SCENE) = self.position.y - self.size.height

So, basically when this image goes up with linear moment it will create a duplicate just behind it..it gets wiped after it goes off screen.

Another Rule:

when attribute self.position.y > self.size.height
->destroy actor

`````This works BEST when the bg covers the screen/positioned properly...

Good luck! Heres a link to a template i just made for it:

http://www.fileserve.com/file/BG7XJfq

If someone knows a more efficient way i would love to know myself!

mynameisace

You don't want to be spawning all the time, especially big images like a background or it will crush the device.

It isn't parallax scrolling what he is on about, parallax scrolling is different images moving at different times to give a 3D depth effect.

What is the background going to be? A sky? If so there is a miles easier way to do it which uses virtually no resources.

Ace

mangaroo

Its not the best as i said, but it works - I can't really do a seamless background without it...but then again im new

" If so there is a miles easier way to do it which uses virtually no resources."

Thanks for the info...! Anyone aware of a better way?

old_kipper

Can it not be done with three actors for the background?

two for the crossover of images onscreen and a third which is moving to the position to be ready to be visible (dependant on direction of scroll)

mangaroo

the problem is as soon as part of the image moves down - u have a space where it moved from...the only way to fill in that gap and create a seamless background is to have no gaps - so no gaps + constant moving...has to mean constantly producing the images - unless u split your background into like 5 or so similar actors and try it like that...might help reduce the damage of spawning large backgrounds

mynameisace

mangaroo said:
Thanks for the info...!

I was asking if that's the way he was doing it so I could help out, I want all the information so I know I'm helping properly, doing it with NO spawns is best for the devices memory, especially big files. I don't want clever remarks when I'm trying to help, especially from someone who just said they were new and didn't know of a better way. I was on my iPhone whilst recording in the recording studio trying to help out in between takes.

@george Email me more details and I'll set up a file for you as I have some free time tonight. Info@instantmashgames.com

Ace