Post by geod in River City Ransom/Double Dragon Scripting help?

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Here is the ram map of River City Ransom:

https://github.com/BillyWM/FCEUX-Lua-Script-Collection/blob/master/River%20City%...

We have the info we need here.

Player1

00B9: How far player is above ground level
	0 when on ground
	31 height of jump
	32 when on a ledge
	63 height of jump from top of ledge

Suppose that (x0, y0) is the bottom left position(BL) of character on 2d space and (x1,y1,z1) is the position of BL of shape in 3d space.

The conversion formula will be:

x1 = x0

y1 = ReadMem(00B9)

z1 = y0 - y1

I think you should have the basic IT background if you want to tack that game because it involves some scripting work here.

JJXB6 years ago

okay, coming back to it every now and then there's been one major issue with the scripting that i cannot get past: i can't seem to get ReadMem to even work. without quotes in the brackets, 00B9 is seen as a malformed number and with quotes inside the brackets, i get an error about trying to index a null value. I've tried appending ReadMem with both Script. and ScriptManager after having once again looking through the scripting manual itself. am i doing something wrong or have i just stumbled upon a bug?

geod6 years ago

Hi, we should convert it to decimal i believe.

JJXB6 years ago (1 edit)

what eventually got it reading anything at all was to enter Script:ReadMem(B9). but now i'm running into the issues of:

1. setting z1 not having any effect on object position at all.

2. the fact that when y1 is set to read from B9, it keeps spitting out numbers that are inconsistent with the information in the linked FCEUX lua repo (constantly changes between higher values than it should and zero even when the player is standing. gonna investigate more in FCEUX myself just to see if there's something i'm missing though. because applying the value from B9 to the shape.Offset.Z of the player sprite, it flickers between way out into the field and back to where it was.

Edit: okay, i solved most of that. the trouble is now i can't rely on memory addresses because if i want it to apply to enemies there's too many memory addresses i'd have to look up per the fact that there's multiple enemies. and also items. i'll post my current 3dn in the WIP section but unless you can get certain states without memory address reliance, i think i'm probably gonna only poke at it every so often.

geod6 years ago

Completely agreed! Multiples enemies moving in 3D space are in fact the real issue here ... Right now i don't have any solution for it myself :)

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