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04-20-24 07:23 AM |
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| 0 users currently in ROM Hacking | 2 guests | 2 bots |
| Main - ROM Hacking - Air Man's Stage foreground | New thread | New reply |
| Mastershake |
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Newcomer Level: 3 Posts: 1/1 EXP: 71 Next: 57 Since: 05-21-10 Last post: 5082 days Last view: 5082 days |
I'm working on a hack of MM2, and have been working on Air Man's stage, today, and there's a problem; the background is a foreground, and I want to make it be a background. Which line/variable controls the background of Airman's stage, and tells it to be a foreground, and what would I have to change it to, in order to make it a background? |
| NetSplit |
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Level: 32 Posts: 153/178 EXP: 187939 Next: 18503 Since: 02-26-07 Last post: 2211 days Last view: 2136 days |
Alright, so, the foreground stuff in MM2 is on for the entire Air Man stage and not on for any other, so in finding this, looking for a check against the stage number would be a good idea. So, I needed to know what RAM address the current stage was. I fiddled around on the stage select screen in FCEUXD and figured out it was $2A, though there are other ways to do that. With that, it's a matter of either watching $2A during gameplay to see what reads it and checks if it's Air Man's stage (stage number 01), or just searching in a hex editor. It's safe to say it's probably doing a load and then compare, so if you searched for LDA $2A CMP #$01, you'd probably find it. In this case, that works, though I was easily able to locate it during gameplay by watching that address, as well.
So, now that I've given that explanation: $3CCF8 is the #$01 in that CMP. That defines which stage has things entirely in the foreground. You can mess with that routine to change how the game does foreground stuff, or just change that value to make a different stage have foreground (you can make no stage have foreground by making the value a non-stage value). |
| Jigglysaint |
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 Red Paragoomba Level: 20 Posts: 51/62 EXP: 38520 Next: 3919 Since: 04-04-07 Last post: 4611 days Last view: 2348 days |
You can also use that location as an entry point for an ASM hack that can have more than one stage use foreground, or even have it so each stage could have a list of what screens have foreground. Toadman's stage in Megaman 4 is kind of like this too, though more than one stage in that game use foreground. |
| Main - ROM Hacking - Air Man's Stage foreground | New thread | New reply |
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