Object List	$04: Auto Roll Tag ->

The Path Swapper is an object in Sonic the Hedgehog, theoretically able to appear anywhere in the game where its necessary to change Sonic's collision path, though it only appears in Green Hill and Star Light Zones, positioned in and around the levels' loops. The functionality of this object is how Sonic is able to run through complex terrain, such as loop-de-loops.

This object was backported from Sonic 2, removing the need for the dedicated subroutine found in Sonic_Loops.

File: _incObj/03 Collision Switcher.asm

Changes from Sonic 1

• Sonic 1 used a 256x256 chunk system that has been converted to 128x128.
• This object replaces the original system, wherein loop handling was performed via a flag check. If Sonic ran through specific chunks, the chunk would swap with another, visually identical chunk, whose solidity would allow him to run through.

Changes from Sonic 2

• Word-length obPriority pointer due to the new Priority Manager.
• Word-Length obRespawnAddr added due to the S3K Object Manager.
• The object has been slightly rewritten to process more efficiently.

This object has various subtypes that dictate how Sonic's collision handling works, based on the direction of collision, and whether or not he is grounded.

	x0	x1	x2	x3	x4	x5	x6	x7	x8	x9	xA	xB	xC	xD	xE	xF
0x	Render	Addr	Addr	Addr	Gfx	Gfx	Map	Map	Map	Map	XPos	XPos	XPos	XPos	YPos	YPos
1x	YPos	YPos	~	~	RespawnAddr	RespawnAddr	~	~	Priority	Priority	Frame	~	~	~	~	~
2x	~	~	~	DispWid	~	~	~	~	Subtype	~	~	~	~	~	~	~
3x	obPSwap_Radius	obPSwap_Radius	obPSwap_Flag	~	~	~	~	~	~	~	~	~	~	~	~	~

• Sprite Mappings: _maps/Collision Switcher.asm
• VRAM Location: ArtTile_Ring ($5F4)

• Obj03 - Sonic 2
• Obj_PathSwap - Sonic 3K