PHY

PHY is the extension for Source's proprietary collision model data format. It stores data for the rigid or jointed (ragdoll) collision model used by the MDL. In addition, it stores prop_data information about a model such as which gib-models to use if destroyed.

File Format

In brief, a PHY file is formed by:

• A main header, which specifies the number of solids
• A series of VPHY/collision data sections, one per solid
• A series of textual data sections, one per solid

Main header

The first bytes of the file form the main header:

struct phyheader_t
{
	int		size;           // Size of this header section (generally 16)
	int		id;             // Often zero, unknown purpose.
	int		solidCount;     // Number of solids in file
	long	        checkSum;	// checksum of source .mdl file (4-bytes)
}

Collision data sections

There will be a series of these sections, back-to-back, numbering the same as the header's [code]solidCount[/code].

Todo: Document headers for each solid

Todo: Document "old format" if VPHY is not seen

Text sections

Todo: Document key-value data for each solid

See also

• Model Creation Overview