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Noob question about building levels

Discussion in 'Engineering & Reverse Engineering' started by IcePak, Sep 19, 2005.

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  1. Sep 19, 2005 #1
    IcePak

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    When building a level in Sonic 2, how can I change the properties of the level or ROM so that I can use the entire space to build my level, rather than the limiting predefined space for the levels that are already in place?

    As an example, the default EHZ limits you from using space underneath the pre-exisiting level, and when you play the level, if you go below a certain height you die. Or rather you fall off the screen. Is there a way to bypass this, and change it so I can use the entire space within a level?
     
  2. Sep 19, 2005 #2
    Quickman

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    If memory serves me correctly the bottom of the level is decided by the rasterised background scrolling.

    Which reminds me: Thank you for a coherently worded easily read post. The grammar nazi in me thanks you.
     
  3. Sep 19, 2005 #3
    Guifrog

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    ...change the level size arrays...
     
  4. Sep 20, 2005 #4
    Heran Bago

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    Ah! It's Puyo battle then. Tech Member
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    More info please. This interests me too.
     
  5. Sep 20, 2005 #5
    Rika Chou

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  6. Sep 20, 2005 #6
    Hivebrain

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    You can also use the level size array to make levels that wrap vertically or horizontally - I think by setting a boundary to $FFFF (correct me if I'm wrong).
     
  7. Sep 20, 2005 #7
    Aurochs

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    Whatever catches my fancy
    Nemesis actually said that the size should be $FF00 for Y-wrapping.
     
  8. Sep 20, 2005 #8
    Tweaker

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    Really? I could've sworn it invloved adding $8000 to the x/y value...
     
  9. Sep 20, 2005 #9
    LOst

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    That leaves 7 bits of nothing. So if only one bit is used to wrap the level, and 8 bits are used for the level size, what's the use for those 7 bits left?
     
  10. Sep 20, 2005 #10
    Tweaker

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    My bad. I'm thinking of objects, and how you can choose whether or not they respawn after exiting the player area.
     
  11. Sep 20, 2005 #11
    Rika Chou

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    FF00 0800 will allow the level to wrap vertically, IIRC.
     
  12. Sep 20, 2005 #12
    IcePak

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    Thanks for the help.

    I assume this is all done by editing the hex code in a hex editor. I've only briefly read a tutorial on editing hex, but it looks like I'm going to have to learn how to if I want to get the levels I've designed working.
     
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