Sims 3:0x05CD4BB3

World Routing
TypeID:	0x05CD4BB3
Game Version:	The Sims 3

Overview

This seems to provide routing information within the world. The data for the entire map is broken up into small blocks.

Header/index

DWORD version 1
DWORD count1
DWORD count2
REP count1 x count2
    DWORD offset from the end of this list to the route block location
REP count1 x count2
    -- route block

Route block

WORD vertex count
REP vertex count
    WORD offset from the end of this list to vertex data
REP vertex count
    BYTE path count
    BYTE usage
    BYTE X position (Within this block)
    BYTE Y position (Within this block) 
    REP path count
        BYTE destination vertex (Index to vertex within the destination block)
        BYTE destination block (Relative)
    REP path count
        BYTE path type

Each point defines a vertex in a graph of route information. Several different route types are used, as defined in the vertex data. The bulk of the routes are type 7, which forms a mesh over most of the area sims can get to. However it is unclear what it is actually used for.

Vertex usage number	Context
65	Vertex is center of a lot
66	Vertex is part of the border of a lot
71	Vertex defines a foot path
77	Vertex defines a road
78	Vertex defines an object footprint
80	No special usage
81	No special usage - all paths end in different blocks

Path type	Context
0	(Not seen)
1	Lot edge to center
2	Lot edge to edge
3	Road
4	(Not seen)
5	Foot path
6	Footprint edge
7	Unknown

The destination block defines which block the path ends in relative to the current block.

Bits	Usage
NNNxxxxx (7..5)	North/south difference, with 3 being no change, positive is south, negative north
xxxNNNxx (4..2)	East/west difference, with 3 being no change, positive is east, negative west
xxxxxxNN (1..)	Unknown

For example, 108 (01101100) means it is in the same block, 80 (01010000) means it is north-east one block. Paths are symmetrical, so the destination vertex has an identical path going the other direction.