Map blocks and block models

A map is a list of blocks on a grid of squares. Each block names a block model, the square it stands on, which way it faces and a word of flags; the flags pick which of the model’s prepared shapes is drawn, so the map stores the road’s connection shape and the game needs no neighbour logic to draw it. Observed · the 65 campaign maps, every block placed

The world frame

Positions are metres in a right-handed frame with +Y up, the grid along X and Z, stored as they are with no axis negated. Read as left-handed (Z negated), the world is mirrored: the start banner’s lettering reads backwards; read as stored it reads the right way. Triangles wind counter-clockwise seen from the front in this frame. Observed · renders of campaign map A01

The grid

The square size comes from the collection’s zones (CollectionZones): Stadium’s squares are 32 m wide and 8 m high. Observed · the Stadium collection GBX.NET’s block size for Stadium is the same, 32 × 8 × 32. Sourced · GBX.NET

A block model is built in a block-local frame that spans 0 to 32 m in X and Z per square, with the Stadium grass ground at local height 1.0; ground blocks stand at map height 1. Observed · the stock and downloaded maps

A block

Field	Meaning	Confidence
Name	The block model’s collector ident	Observed · the 65 campaign maps
Direction	0 to 3, quarter turns about +Y; each step takes +X to +Z, so (x, y, z) becomes (−z, y, x)	Observed
Coordinate	The square of the turned footprint’s least corner; block data version 6 and later store the coordinate plus (1, 0, 1)	Observed
Flags	Below	Observed

The sense of the turn is measured on road: over the stock maps and the 2026 and all-time top downloads, the open sides of neighbouring StadiumRoadMain blocks meet 4,400 times with 11 mismatches when a step takes +X to +Z, against 2,578 and 765 the other way. Observed · the stock maps and 200 downloaded maps With the least corner of the turned footprint at the coordinate, 300 squares of the stock maps are claimed twice, mostly the dirt-hill terrain under the dirt-hill road blocks; with the model’s first unit as the pivot, 1,682 are. Observed · the stock maps The turned footprint’s least corner is at the coordinate times (32, 8, 32) m. Observed · the 65 campaign maps

Flags

Bits	Meaning	Confidence
0–5	Variant: the outer index of the model’s mobil lists	Observed
6–11	Sub-variant: the inner index	Observed
12	Ground: use the model’s ground mobils; otherwise its air mobils	Observed
13	Clip: the sub-variant is always 63	Observed
14	Pillar: the pillar is a block stored in the map; the game generates none	Observed

Over the 65 campaign maps every block resolves this way; a block whose list is empty draws nothing. Observed[the 65 campaign maps] A clip shows the first mobil of its variant’s list; this is reasoned from Stadium’s clip models, which have one mobil per ground list and empty air lists. Inferred

StadiumRoadMain’s variants 0 to 5 are Base, Deadend, Corner, Straight, TShaped and Cross; the ground Straight has four sub-variants (Straight, A, B and C). Observed · the Stadium block model

Ground and empty squares

A ground block draws the terrain of only the squares of its units at relative height 0 (a unit’s offset y of 0), not of its whole footprint: a bridge arch stands on 2 of the 6 squares it spans, and the others show the zone’s grass. Filling the whole footprint leaves visible holes in the grass. Observed · campaign map A01 A square of the map area that no ground block covers shows the collection’s default zone’s flat block (StadiumGrass, the first block info of ZoneFlat) at height 0. Observed · the 65 campaign maps

Start blocks

A spawn faces its local +Z. Of the 25 campaign start blocks (way point 0 or 4) with road on one side only, 23 have it ahead along local +Z; 36 have road on both sides and 4 on neither. Observed · the start blocks of the 65 campaign maps

Block models

The block-info files (CGameCtnBlockInfoClassic, Flat, RectAsym, Road, Clip, Frontier and Pylon) keep their units and mobils in the legacy chunk 0x0304E005, never in 0x0304E01D or 0x0304E01E. Proven[every block-info file of the install’s packs]

Order	Field	Type	Confidence
1	Name	ident	Observed
2	Size	three i32	Observed
3	Is pillar	bool	Observed
4	Selection	i32	Unknown
5	Unknown	i32	Unknown
6	Pillar	node reference	Observed
7	Ground units	counted node references	Observed
8	Air units	counted node references	Observed
9	Ground mobils	counted lists of counted node references	Observed
10	Air mobils	counted lists of counted node references	Observed
11	Unknown	u8	Unknown
12	Unknown	i32	Unknown
13	Unknown	two i16	Unknown

The layout reads every block-info file of the packs to its end. Proven · every block-info file of the install’s packs A real block has no ground units: all its units are in the air list. The mobils are one list per variant, holding the variant’s sub-variants, not one list per unit. Observed · every block-info file of the install’s packs

A unit (CGameCtnBlockUnitInfo, 0x03036000) holds its offset within the block, four clips and a surface ID. Observed · every block-info file of the install’s packs

A mobil’s solid places its parts through CPlugTree locations; see solids and visuals.

The map’s thumbnail

The thumbnail of header chunk 0x03043007 is a JPEG stored bottom row first. Observed · campaign map A01

What do the block-info fields 4, 5 and 11 to 13 mean?

They are read and accounted for, but nothing yet ties them to the game’s behaviour.