Simple Guide: How to collide with water when hurt (Sonic 1)

This guide will make it possible for Sonic to collide with when he is hurt.


Firstly go to this position:

Code:

; ---------------------------------------------------------------------------

; Sonic when he gets hurt

; ---------------------------------------------------------------------------

Obj01_Hurt:	; XREF: Obj01_Index

jsr SpeedToPos

addi.w #$30,$12(a0)

btst #6,$22(a0)

beq.s loc_1380C

subi.w #$20,$12(a0)

loc_1380C:

bsr.w Sonic_HurtStop

bsr.w Sonic_LevelBound

bsr.w Sonic_RecordPos

		; <--

bsr.w Sonic_Animate

bsr.w LoadSonicDynPLC

jmp DisplaySprite

Next; we add this line in the area provided:

Code:

bsr.w Sonic_Water

And you should have this:

Code:

; ---------------------------------------------------------------------------

; Sonic when he gets hurt

; ---------------------------------------------------------------------------

Obj01_Hurt:	; XREF: Obj01_Index

jsr SpeedToPos

addi.w #$30,$12(a0)

btst #6,$22(a0)

beq.s loc_1380C

subi.w #$20,$12(a0)

loc_1380C:

bsr.w Sonic_HurtStop

bsr.w Sonic_LevelBound

bsr.w Sonic_RecordPos

bsr.w Sonic_Water ; <--

bsr.w Sonic_Animate

bsr.w LoadSonicDynPLC

jmp DisplaySprite

Thats all there is to it really. Make a build of your rom and test it out.


Heres a video demonstrating the fix of collision, RHS' tribute and me pointing out a terrible feature with the water table technique. that will be posted in the the discussion topic later... Anyway:


[media]http://www.youtube.com/watch?v=14GuMsHzA_g&feature=youtu.be[/media]

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Hate to burst your bubble, but someone has already put a guide like this out there. Well, for Sonic 2 at least. No idea about Sonic 1.

 

Well, I have never seen one for Sonic 1, but since they share nearly the same codes, It is very relivant that there is one out there. But at leas thist guide is as simple as the other guide I posted. But I value the information none the less.