Posted: 2/1/2013 1:22 PM
Post subject: Finding Nemo
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Odongdong
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Sega TAS of 2014
I was making my first TAS with this game since last week. I expected it would be easy, but the game's physics is complicated than I thought. After lots of trial and error, I found a glitch in first level, which is awesome. So far so good. Anyway, here's my WIP that completes first two level: http://tasvideos.org/userfiles/info/4298203092772943. Since I don't have Youtube account, I couldn't post the encode. Sorry for inconvenience.
Posted: 2/1/2013 2:02 PM
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Warepire
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It looks really good to me, although I never played the game. Do you need help finding RAM Watch values?
Posted: 2/1/2013 2:21 PM
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Odongdong
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Sega TAS of 2014
Well, I think I can do it by myself. Actually I searched and checked RAM Watches to make sure every boost I made is optimized. There are RAM addresses which stand for X/Y speed and direction. X/Y direction is very useful pointer to make TAS because boosting is only possible when its value is not zero. Only annoying and weird thing is that these RAM address change when I enter other stage, so I have to re-search again to find them(but it takes just several minutes, so I don't think it bad). GBA uses 4 bytes, doesn't it?
Posted: 2/1/2013 3:09 PM
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Warepire
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Odongdong wrote:
Only annoying and weird thing is that these RAM address change when I enter other stage, so I have to re-search again to find them(but it takes just several minutes, so I don't think it bad). GBA uses 4 bytes, doesn't it?
GBA uses 1, 2 and 4 byte integers. Your values can be either one of these. Regarding that the values change places in RAM for each level means that the values are re-created for each level, if you're lucky there is an address in memory that keeps track of the new location for each level, you can find this by entering a level you know the RAM address for, then RAM search for that address, if you find any entries, watch those and see if they change when you go to another level, and if they changed, check if their values are addresses in RAM where the value has moved to.
Posted: 2/2/2013 3:43 AM
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Odongdong
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Sega TAS of 2014
I've tried your suggestion but got no valid result. They only show meaningless figures when moving to next level. I convert them into hexadecimal number but still have no idea what they mean. I'll just attach my address list when I submit this. There's actually more puzzling problem than this. I'm now in stuck at level 3. This level has only a single minigame like this: It seems that the game ends when I travel a certain distance(the number of rings collected does not count, it varies whenever I play), but I can't find RAM addresses which indicate boost counter, which is bad news for making TAS. This gonna take some time....
Posted: 2/2/2013 3:51 PM
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Warepire
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Odongdong wrote:
I've tried your suggestion but got no valid result. They only show meaningless figures when moving to next level. I convert them into hexadecimal number but still have no idea what they mean. I'll just attach my address list when I submit this.
If you give me the addresses you know for level 1 and 2 I can try to find something if you want me to.
Posted: 2/3/2013 1:27 AM
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Odongdong
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Sega TAS of 2014
Well, um, the list is here: https://www.dropbox.com/s/d2drwdkclzkgb6u/Finding%20Nemo.wch?m I'll appreciate it if you find something. Edit: done with finding RAM addresses on level 3.
Posted: 2/4/2013 11:20 PM
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Warepire
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I found the pointer address to the speed-addresses, sadly it's ALSO level-dependent, so the pointer also changes location from level to level, and there doesn't seem to be any pointer to keep track of the pointers. If you want to try to find a pattern in the pointer addresses they are here: 02025BA4, 4bytes, hexadecimal, x-speed-ptr for level 1 02034950, 4bytes, hexadecimal, x-speed-ptr for level 2-1 0201CCD0, 4bytes, hexadecimal, x-speed-ptr for level 2-2 I guess the game loads the level (hit-boxes etc) into RAM before it loads the mechanics (speed values etc), so the size of the level decides how far the speed values etc is offsetted (is that a word?) from the initial address (the address where the game starts writing level specific data in the RAM). I also discovered that the speed values are 2byte values, in some levels you may avoid some artifacts in the values if you reduce the watched scope to 2bytes instead of the current 4bytes. It may also make the values easier to find in some levels if you search for 2byte values.
Posted: 2/5/2013 10:58 AM
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Odongdong
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Warepire wrote:
I found the pointer address to the speed-addresses, sadly it's ALSO level-dependent, so the pointer also changes location from level to level, and there doesn't seem to be any pointer to keep track of the pointers. If you want to try to find a pattern in the pointer addresses they are here: 02025BA4, 4bytes, hexadecimal, x-speed-ptr for level 1 02034950, 4bytes, hexadecimal, x-speed-ptr for level 2-1 0201CCD0, 4bytes, hexadecimal, x-speed-ptr for level 2-2 I guess the game loads the level (hit-boxes etc) into RAM before it loads the mechanics (speed values etc), so the size of the level decides how far the speed values etc is offsetted (is that a word?) from the initial address (the address where the game starts writing level specific data in the RAM).
Sad that the location of fixed pointer is still unknown. But that's okay; still I can handle finding addresses because it doesn't take so long.
Warepire wrote:
I also discovered that the speed values are 2byte values, in some levels you may avoid some artifacts in the values if you reduce the watched scope to 2bytes instead of the current 4bytes. It may also make the values easier to find in some levels if you search for 2byte values.
My goodness, why didn't I recheck values within 2bytes? I could have missed something important. Thanks for your support! By the way, let me talk about the process. I finally found an optimizing strategy in level 3 and finished it just a while ago. I saved about 300 frames than I thought it would take. WIP is here : https://www.dropbox.com/s/uli7hu3dv15f8mm/Finding%20Nemo%20-%20~level3%2C%2020130205.vbm If memory serves me, there's no specific obstacle till level 6. I'll post my WIP then.
Posted: 2/8/2013 7:56 AM
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Odongdong
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Sega TAS of 2014
http://tasvideos.org/userfiles/info/4448707061259396 Five is done, seven to go.
Posted: 2/20/2013 8:30 AM
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Odongdong
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Sega TAS of 2014
Whoa, I was busy these days! Here's my WIP, I'm now in level 8. https://www.dropbox.com/s/2wbquy0follwwr8/Finding%20Nemo%20-%2028%2020130220.vbm
Posted: 2/23/2013 3:03 PM
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Warepire
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Looks good to me so far.
Posted: 2/24/2013 2:54 AM
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Odongdong
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You know what, I just found a critical mistake on stage 3. A textbox in the beginning can be skipped 21 frame earlier. Now I have to start it from here. Aw....
Posted: 2/24/2013 11:36 AM
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Warepire
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Odongdong wrote:
You know what, I just found a critical mistake on stage 3. A textbox in the beginning can be skipped 21 frame earlier. Now I have to start it from here. Aw....
Maybe you can hex the remaining levels afterwards, so you don't have to re-do everything.
Posted: 2/24/2013 3:13 PM
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Odongdong
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Sega TAS of 2014
You mean editting movie file by hex editor? Hmm, I'll check VBA wiki and figure out how to do it.
Posted: 3/9/2013 9:11 AM
(Edited: 3/9/2013 11:00 AM)
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Odongdong
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Sega TAS of 2014
Okay, I tried several times to attach old input to new one, resulting in nothing but desync. I'm sure this is because stage 3 is very laggy so that even a single change on input will mess up everything. I'm going to redo stage 3 and try editting on stage 4.
Posted: 3/9/2013 10:46 AM
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Warepire
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That sucks. I hope the game will cooperate more on level 4.
Posted: 3/14/2013 11:52 AM
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Odongdong
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Sega TAS of 2014
I used the editor on level 4, and thankfully it syncs perfectly. After that, however, it turned out that pearl bouncing operates randomly, so every sub-stages I used pearl bouncing need to be redone. Well, still I'm satisfied I can revive some of inputs.
Posted: 3/27/2013 1:47 PM
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Odongdong
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Sega TAS of 2014
I'm back again. Did I say I missed a couple frame? Well, while redoing the whole thing, I found some shortcuts I hadn't noticed. I finished level 8 and so far saved 389 frames comparing to old run. Yeah, it was worth it. Here's my WIP, by the way : http://tasvideos.org/userfiles/info/5497669584088249 The movie will desync on level 9.
Posted: 3/30/2013 6:57 PM
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Odongdong
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Sega TAS of 2014
Done. I'm going to submit this in a day after writing some texts for submission. For those who want to watch it in advance, here's the download link: https://www.dropbox.com/s/s1cql8n9uvoy5qn/Finding%20Nemo%20final%20-%2020130331.vbm?m