Basic Questions and Answers Thread

I've noticed some Sonic 1 ROM hacks with Sonic 3's full walking animation, so I wanted to do the same.


I have found out Sonic 1 has only 6 walking frames on separate angles


and Sonic 3 has 8 walking frames on separate angles.





So I decided to try to put Sonic 3's walking animation in Sonic 1.


I tweaked the walking animation and this is what I get when I walk on slopes/hills.





2 walking animation on ground and 4 on hills...


I know that Sonic 1 only reads 6 walking animations per angle, and the game thinks the slope/hill walking animation should start right after the 6th of


Sonic's walking on-ground animation.


Any suggestions? :\

 

You need to edit his animation script.


Edit: going from that shot, his walking script should be $6, $7, $8, $9, $A, $B, $C, $D


You will probably have to edit most if not all of his animation script.

 

Actually, I do. But first tell me, do you have ANY other issues as far as any other animation? Seems Rika_Chou beat me to the stick on this one. Out of curiosity, did you take out the last 2 frames of the walking sprite? If not, then your hack is bound to fuck up.

 

loc_13A9C:
lea (SonAni_Run).l,a1 ; use running animation


cmpi.w #$600,d2 ; is Sonic at running speed?


bcc.s loc_13AB4 ; if yes, branch


lea (SonAni_Walk).l,a1 ; use walking animation


move.b d0,d1


lsr.b #1,d1


add.b d1,d0


loc_13AB4:



I may also strongly recommend you replace the above code with:



loc_13A9C:
lea (SonAni_Run).l,a1 ; use running animation


cmpi.w #$600,d2 ; is Sonic at running speed?


bcc.s loc_13AB4 ; if yes, branch


lea (SonAni_Walk).l,a1 ; use walking animation


add.b d0,d0 ; x4


add.b d0,d0 ; x8


loc_13AB4:



If you are in need of all 8 frames on all angles, then this will ensure that the angle will advance multiples of 8 frames instead of multiples of 6.

 

But if he were to do that, he would also need to go and add in those 2 frames on all versions of the sprite that shows up, then he would have to sit there for bout an hour just to get his shit straight, assuming he didn't do anything else. Hmm.... I think there is a different way of doing this, let me check....


edit: you know what, I just did a little test....except I ported the whole S2NA animation script in. Anyways, seems that you are correct my good sir. That is the easiest way to fix it. So if he decides to do it, let him go for it.

 

All of my walking sprites have 8 frames per angle. I already fixed my other animations.

This is going somewhere, although the walking (except for ground) animations are playing in different orders. I'll try to figure this out.

 

....you could get the S2B4 disam and port it over into your game. Seems both S2 and S3 have the same amount of walking sprites. It would make life easier for later.

 

I finally got it working just by one edit.



loc_13A9C:
lea (SonAni_Run).l,a1 ; use running animation


cmpi.w #$600,d2 ; is Sonic at running speed?


bcc.s loc_13AB4 ; if yes, branch


lea (SonAni_Walk).l,a1 ; use walking animation


add.b d0,d1 ; x4


add.b d0,d0 ; x8


loc_13AB4:



Simply changed "add.b d0,d0" to "add.b d0,d1"


Thanks, Markey.


Hopefully I don't run into other problems just by one simple edit. :


EDIT: and I ran into a problem. Actually a problem I had and still have before Markey shared the code...


EDIT2: I'm just going to stick with 6 frame walking animations for now... Since I can't figure out what's going on.

 

You'll find more details about how it works in this thread: http://sonicresearch.org/forums/index.php?showtopic=2445&hl=walking&fromsearch=1

 

That will look kinda hackish. It would really be better to try and figure out how to fix it to use all 8 frames. It's not hard once you understand what you're doing.

 

How do I add Stages to Sonic 2's Stage Select? I just finished building a "corrupt" stage (Corrupt EHZ as a Null Hill Zone without messing up EHZ) and i'm wanting to add it to the stage select.


Also I'm wanting to add a stage card with the stage. Everytime I try adding one it goes corrupt. I go without it reads as EMERALD HILL ZONE.

 

Ok, so I finished parts of my new title Sonic, saved mappings and art, changed animation...and this is what I get when I build.





My new mappings are causing this, but I'm not sure why.

 

Answer here: http://sonicresearch.org/forums/index.php?showtopic=857

 

Oh damn, I didn't even see you appear spiritulinsanum, you beat me to it while I was typing. Never mind, just follow the link above.

 

I did nothing to my asm. Just saved mappings and art, and this came along. Not to sound like an idiot, but in honest, I do not know how to start off with the guide.

 

If I were you, I would recommend getting context. it makes fixing errors like that lots more easier as you can actually search for the line were the error is (the number in parenthesis after s1comb.asm).

 

My bad, that tutorial deals with more complex cases, sorry.


Though changing mappings and art is far from being nothing for your disassembly. Every little byte you add pushes all the data following it.


So, anyway, I wrote about it there instead:http://sonicresearch.org/forums/index.php?showtopic=2288&st=0#entry21808 read part "3.2 Assembly general fixes"

 

loc_FA58:


move.w d4,d2


bsr.w MvSonicOnPtfm <-- Line 22098


moveq #0,d4


rts


Do I have to change the bsr.w to something else, or is it more complex than that? Ehh, of course it is.

 

Change it from bsr.w to jsr. Here's a little map of the instructions you use should they be out of range:


bsr.s -> bsr.w -> jsr


bra.s -> bra.w -> jmp


With bra.s/bsr.s being the smallest to jmp/jsr being the largest.

 

I changed bsr.w to jsr, though nothing is happening. Do I have to do anything in the MvSonicOnPtfm routine?