Pokepal17's tut no.1 - Resizing Overworlds
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March 28th, 2009 (7:43 AM). Edited April 15th, 2010 by hashtag.
Join Date: Oct 2008
In this tutorial, I will teach you how to resize an overworld sprite.
:pokeball:Overworld Editor RE
:pokeball:A Hex Editor (I’m Hex Workshop)
:pokeball:A ROM (I’m using Fire Red BPRE)
:pokeball:An Emulator (I’m using VBA)
Okay now first of all load up your ROM and find the overworld that you want to resize. In my case I will be resizing the fallen old man from Viridian City.
First enable Expert Mode by pressing Crtl + M. Now look at the data. The info 1 sprite header is the main data of the overworld and the info 2 sprite header is the data of the particular overworld frame.
Let’s look at this in a hex editor. My way of finding the hex data is by searching for the reversed sprite pointer.
So I would do this:
083A0A70 ---> 700A3A08
And when we search it we get a result.
Now we find the beginning of the data by going back until we come to FFFF.
Now I will explain what each bit of data is:
FFFF – Starter bytes
04 – Palette Index
11 FF 11 – Unknown data 1
0002 – The data size (the number of bytes the sprite takes, reversed)
20 – Width (hex)
00 – Unknown byte 1
20 – Height (hex)
00 - Unknown byte 1
14 01 0000 - Unknown data 2
18 37 3A 08 – Unknown pointer 1 (reversed)
F0 37 3A 08 – Unknown pointer 2 (reversed)
68 33 3A 08 – Unknown pointer 3 (reversed)
70 0A 3A 08 – Sprite Pointer (reversed)
FC 1C 23 08 – Unknown pointer 4 (reversed)
And there is the layout
You will need to find a sprite which has equivalent dimensions to the new dimensions of the overworld you’re resizing. Now I will be resizing my sprite to 64 x 64. So what I need to do is find another 64x64 sprite (the speedboat) in overwold editor.
Now first of all edit the data size to equal the one of the sprite you just looked up in overworld editor. So I will need to change it to 00 08 because that’s the data size reversed.
Next change the dimensions to what you want them to be, I’m having 64 x 64 so I’ll change the length and width bytes to 40 (coz that’s 64 in hex).
Now for the important bit, change the unknown pointers 1 and 2 to the ones of the sprite you looked up in overworld editor. This will determine how the sprite appears in game. If you don’t change them, then the overworld won’t look right in-game.
So what I’ll do is:
18 37 3A 08 --> 20 37 3A 08
F0 37 3A 08 --> D0 37 3A 08
So for me I change
Save and look at the resized sprite in overworld editor. You’ll see that the frames have joined, so they need repointing.
Now follow the sprite pointer and you will come to the pointers of the frames (sprite pointer info 2). Find out how may frames your sprite has and repoint the first (number of frames) pointers to a clean offsets. For the offsets, just find some FF in your hex editor and reverse the offset and replace the first pointer with it. Now to tell how much space you’ll need for each frame, convert the unreversed new data size into decimal.
So I get 0800 ---> 2048
So I’ll need 2048 bytes for each frame. So I repoint the frames to new offsets with enough space. I’m going to repoint to the offset 71A23C for my first frame so I reverse it and get 3C A2 71 08
After each frame pointer there is the old data size for the frame; replace it with the new one (in my case 00 80.)
Since all my frames are going to have the same images I’m repointing the frames to one offset but you’ll need to repoint to more offsets if you have a different image on each frame.
Now save and go back to the resized overworld in overworld editor. If all went well, the frame will be the last colour in the palette.
Now make your new overworlds.
Test it ingame and it should be fine.
Credits to HackMew for the overworld editor readme file, Darthatron for his advanced overworld spriting tutorial and to Peyi for his tutorial on WAH.
Copyright 2009 Pokepal17
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