SimGrid
SimGrids are files that can be found within Savegame files. They come in 6 different types:
| Type ID | Name |
|---|---|
| 0x49b9e602 | SimGridUint8 |
| 0x49b9e603 | SimGridSint8 |
| 0x49b9e604 | SimGridUint16 |
| 0x49b9e605 | SimGridSint16 |
| 0x49b9e606 | SimGridUint32 |
| 0x49b9e60a | SimGridFloat32 |
They are basically rectangular grids that hold values that the game needs for the simulation. Most of them can be viewed in the Mayor Mode Data Views.
This particular subfile was decoded by smf_16.
Structure
DWORD Subfile Size in bytes DWORD CRC DWORD Memory address WORD Major version (0x0001) BYTE Unknown DWORD Type ID (0x49b9e602 to 0x49b9e60a) DWORD Data ID DWORD Resolution DWORD Resolution power DWORD X size DWORD Z size DWORD Unknown DWORD Unknown DWORD Unknown DWORD Unknown TYPE Values (repeat for x*z times, byte size depends on Type ID)
Data ID
The Data ID specifies what kind of data this SimGrid holds. Not all Data IDs are know yet.
| Data ID | Data type | Name | Description |
|---|---|---|---|
| 0x41800000 | Sint8 | City Overview | The values in it correspond ZoneTypes from the Lot Subfile |
| 0x69d5c40e | Float32 | Traffic related, probably all traffic | |
| 0x69d5c3ac | Float32 | Traffic related, probably car traffic | |
| 0x49d5bc40 | Int16 | Air pollution |
Resolution and resolution power
The SimGrids don't always hold values per tile. If the values are set per 1x1, resolution is 1, if values are set per 2x2, resolution is 2 etc. This value is always a power of 2 (so 1x1, 2x2, 4x4, ...) The exponent is given by the resolution power.
X size & Z size
The amount of rows and columns in the grid. For a small 64x64 city and resolution 1, X & Z size are 64. When the resolution is 2, X & Z size are 32 and so on.
Values
The values for each cell of the grid. The byte size of each value depends on the type of the SimGrid. For Uint8's, this is 1 byte, for Float32's this is 4 bytes and so on.
The order of values is column first. So first comes (0,0), then (0,1), then (0, 2) and so on.
