Texture Subfile

This page pertains to the format of the Texture Subfile within the Savegame files. This file has Type ID c97f987c. This particular subfile was decoded by smf_16.

Description

This subfile contains data about the textures in the city. For every lot in the city 1 texture record exists. Within every texture record is a list of all textures used on the lot, both base and overlay textures.

Structure

The Texture subfile has the following format:

DWORD	Size	
DWORD	CRC	
DWORD	Memory	
WORD	Major version (0x0002)	
WORD	Minor version (0x0004)	
BYTE	Unknown, only seen 0x00	
BYTE	Unknown, only seen 0x00	
BYTE	Unknown, only seen 0x00	
BYTE	Unknown, mostly 0x05, probably an appearance flag. (A)
DWORD	Unknown, always 0x497f6d9d
BYTE	Min Tract X (normally between 0x40 and 0x7f)	
BYTE	Min Tract Z (normally between 0x40 and 0x7f)	
BYTE	Max Tract X (normally between 0x40 and 0x7f)	
BYTE	Max Tract X (normally between 0x40 and 0x7f)	
WORD	X Tract Size? (only seen 0x0002, probably indicating the size is 2²)	
WORD	Z Tract Size? (only seen 0x0002, probably indicating the size is 2²)	
DWORD	Unknown, only seen 0x00000000	
DWORD	Unknown, only seen 0x00000000	
DWORD	Unknown, only seen 0x00000000	
DWORD	Unknown, only seen 0x00000000	
FLOAT32	Min X Coordinate	
FLOAT32	Min Y Coordinate	
FLOAT32	Min Z Coordinate	
FLOAT32	Max X Coordinate	
FLOAT32	Max Y Coordinate	
FLOAT32	Max Z Coordinate	
BYTE	Unknown, seen 0x01 and 0x02	
DWORD	Count of tiles with a texture	
	DWORD	Instance ID of the texture
	BYTE	X tile
	BYTE	Z tile
	BYTE 	Orientation
	BYTE	Priority 0x00 for base texture, 0x01 for overlay texture (actually rather seems to indicate mirroring of the texture)
	4 BYTES	RGBA, see below
	BYTE	Unknown, mostly 0xff but seen 0x03 and 0x01 as well
	BYTE	Texture variation, see below

RGBA

The RGBA bytes can be used to change the color of the texture. They are mostly set to 0xff 0xff 0xff 0xff, but the game sets them to green values for residential zones, blue values for commercial zones etc.

Texture variation

The texture variation byte indicates what texture variant of the texture family the game was using when it created the Savegame. Setting this value does not seem to have any influence as the game randomly picks a texture variant from the family when opening up a city, and even when saving a city.

Remarks

Byte (A) is probably an appearance flag in the same way an appearance flag is used in the Prop Subfile. It is mostly set to 0x05, or 0b00000101.