Post by henke37

Posted: 3/15/2014 9:56 AM

Post subject: Megaman specific questions

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DDRKhat

Player (36)

Joined: 9/9/2006
Posts: 388

As some people in the IRC know as I had asked before - I'm working with a team to make a fan-made Megaman with co-op gameplay (Megaman 2.5D) Thanks to you guys we've managed to nail a few things that felt off but not sure why; I'm back again to ask something... Does anyone have any good solid specific details about water physics? What affects it makes upon a player? Ones I've personally felt is a jumping is higher (although specifically, I don't know), running has always felt a LITTLE slower - only just enough to be noticed (but I could be wrong there). Any info would be highly appreciated!

A whisper in the wind~~

Posted: 3/15/2014 10:25 AM

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Noxxa

They/Them

Moderator, Expert player (4144)

Joined: 8/14/2009
Posts: 4083
Location: The Netherlands

Water physics tend to differ quite a bit between the games. I did a bit of testing on some of the games here: In Mega Man 1, it causes a lag frame every fourth frame, so effectively the game speed is cut by 25%. The physics otherwise are unchanged as far as I know (except in some zipping situations) In Mega Man 2, it causes a lag frame every fifth frame (20% reduced game speed) and gravity is cut by 0.46875 (from 0x40 subpx/frame to 0x1E subpx/frame). In other words, gravity is cut from 0.25 (64/256) pixels/frame to 0.1171875 (30/256). Additionally, jump initial velocity is increased from 04.DF (4.87109375 px/frame) to 05.80 (5.5 px/frame). (See also Wiki: GameResources/NES/Rockman/Data). In Mega Man 3 and on, water no longer causes an overall slowdown. The velocity and gravity numbers are probably different, but I don't know about the numbers in these games offhand.

http://www.youtube.com/Noxxa <dwangoAC> This is a TAS (...). Not suitable for all audiences. May cause undesirable side-effects. May contain emulator abuse. Emulator may be abusive. This product contains glitches known to the state of California to cause egg defects. <Masterjun> I'm just a guy arranging bits in a sequence which could potentially amuse other people looking at these bits <adelikat> In Oregon Trail, I sacrificed my own family to save time. In Star trek, I killed helpless comrades in escape pods to save time. Here, I kill my allies to save time. I think I need help.

Posted: 3/15/2014 12:36 PM

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DDRKhat

Player (36)

Joined: 9/9/2006
Posts: 388

Mothrayas wrote:

Water physics tend to differ quite a bit between the games. I did a bit of testing on some of the games here: In Mega Man 1, it causes a lag frame every fourth frame, so effectively the game speed is cut by 25%. The physics otherwise are unchanged as far as I know (except in some zipping situations) In Mega Man 2, it causes a lag frame every fifth frame (20% reduced game speed) and gravity is cut by 0.46875 (from 0x40 subpx/frame to 0x1E subpx/frame). In other words, gravity is cut from 0.25 (64/256) pixels/frame to 0.1171875 (30/256). Additionally, jump initial velocity is increased from 04.DF (4.87109375 px/frame) to 05.80 (5.5 px/frame). (See also Wiki: GameResources/NES/Rockman/Data). In Mega Man 3 and on, water no longer causes an overall slowdown. The velocity and gravity numbers are probably different, but I don't know about the numbers in these games offhand.

Thanks for the info, I took a look at the Rockman data wiki entry but I wasn't finding anything in regards to the water physics that is why I had posed the question. What you've shared is super helpful though, thanks.

A whisper in the wind~~

Posted: 3/16/2014 12:28 AM

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Bisqwit

Editor, Active player (296)

Joined: 3/8/2004
Posts: 7469
Location: Arzareth

Thanks Mothrayas. Yeah, the part of the wiki article that was written by me (i.e. most of it) was written with TASing in mind, and TAS tends to ignore the water alltogether. (Except in Rockman 2, but I did never TASed the underwater sections of the Bubbleman stage.)

Posted: 3/19/2014 9:23 PM

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DDRKhat

Player (36)

Joined: 9/9/2006
Posts: 388

Took another good look through the rockman data entry... is there any solid info on enemy data? For example the Scworm's? How many projectiles they fire and their HP?

A whisper in the wind~~

Posted: 3/21/2014 7:40 PM

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nesrocks

He/Him

Player (241)

Joined: 5/1/2004
Posts: 4096
Location: Rio, Brazil

It seems that you could benefit a lot from memory search, are you trying that? It isn't as complicated as it sounds, it's actually kind of fun. Here's the page with instructions http://tasvideos.org/MemorySearch.html

aka Nesrocks http://www.youtube.com/user/UoBtExFODA https://nesrocks.com https://twitter.com/bitinkstudios

Posted: 3/26/2014 11:01 AM

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DDRKhat

Player (36)

Joined: 9/9/2006
Posts: 388

FODA wrote:

It seems that you could benefit a lot from memory search, are you trying that? It isn't as complicated as it sounds, it's actually kind of fun. Here's the page with instructions http://tasvideos.org/MemorySearch.html

How likely is that to reveal exact movement patterns and attack data? All I figured is it would reveal what they are doing at the time, such as current health values, the RNG and how that may affect Spawn count...?

A whisper in the wind~~

Posted: 3/27/2014 12:26 AM

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nesrocks

He/Him

Player (241)

Joined: 5/1/2004
Posts: 4096
Location: Rio, Brazil

You asked about an enemy's HP, that is a piece of info that can be tracked by use of the memory search. Truly, movement patterns can't be tracked with that method alone.

aka Nesrocks http://www.youtube.com/user/UoBtExFODA https://nesrocks.com https://twitter.com/bitinkstudios