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The Invisible Solid Barrier is an object in Sonic the Hedgehog, appearing in various levels throughout the game. It is an invisible object spanning across a designated rectangular space based on its subtype, similar to the Lava Tag. This object is placed over portions of the foreground that require additional solidity-related properties. These objects allow Sonic to be crushed by ceilings, and pushed out of walls while standing still on moving objects. Without this object, both of these functions would be impossible without an extensive rework of the solidity detection system.

File: _incObj/71 Invisible Barriers.asm

Changes from Sonic 1

• Word-length obPriority pointer due to the new Priority Manager.
• Word-length obRespawnAddr added due to the S3K Object Manager.

The subtype dictates the size of the block, with the low nybble determining obHeight, and the high nybble determining obDispWid.

For both size parameters, the formula is the following:
SIZE = (NYB + 1) * 8

Every subtype has the following SolidObject parameters.

• Type: Full
• Width: obDispWid + 11
• Height (jumping): obHeight
• Height (walking): obHeight + 1

	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	~	~	~	~	~	~	~	~	~	~	~	~	~	~	~	~