Micro Machines Collision Format

Collision data for Micro Machines is stored in GAME1\ROUNDn.COL files, one per round. It defines which parts of each meta-tile are solid (walls, obstacles, the table edge) and which can be driven on.

File format

The file is a list of 18-byte records, one per meta-tile (in the same order as the .CT file), with no header. The number of meta-tiles is the file size divided by 18.

Each record is a 12×12 bit mask. A meta-tile is 96×96 pixels, so each bit covers an 8×8 pixel square. The bits are stored row by row, most significant bit first, with no padding at the end of a row (12 × 12 = 144 bits = 18 bytes).

To look up a world position x, y (0-3071):

cell    = map[(y / 96) * 32 + (x / 96)] & 0x3F
subx    = (x % 96) >> 3
suby    = (y % 96) >> 3
bit     = suby * 12 + subx
solid   = col[cell * 18 + bit / 8] & (0x80 >> (bit % 8))

A set bit is solid.

The game loads the file into a buffer of 0x480 bytes (64 meta-tiles), so a round cannot have more than 64 meta-tiles.

Credits

This file format was reverse engineered by VorticonCmdr. If you find this information helpful in a project you're working on, please give credit where credit is due. (A link back to this wiki would be nice too!)