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From Sonic Retro

Disclaimer

Each level in Sonic Adventure DX is a compiled C++ file with embedded model data. They are usually similar in structure, but there is technically the possibility that some things may be in different locations for different levels.

COL Format

The name COL is an antiquated misnomer, but for lack of a better name, it stuck. This data struct is a reference for loading a level model. It's 0x24 bytes long and works as follows:

struct COL
float center[3]; // Center of the visibility/collision sphere.
float radius; // Could be diameter.
dword null[2]; // for alignment purposes
dword SEG; // points to SEG struct
dword null; 
Short col; // determines solidity
Short surf_flag; // determines visibility

Surface Flags

First byte:

• 1x = can land on
• 2x = push
• 3x = push
• 4x = Kill sonic?
• 5x = no alpha, no col
• 6x = water
• 7x = lighting
• 8x = Stage Specific on/off (EC footprints)
• 9x = normal surf

Second Byte:

• x0 = normal
• x1 = hurt
• x2 = low traction
• x3 = hurt

Listing of Header locations

This listing isn't for the actual start of the header, that location hasn't been determined. Since the major interest in editing levels is editing their geometry, this list will (for now) refer to the geometry loading index. These use the COL format as described above. Also, when this list was being created, the location selection was a little inconsistent. This has since been corrected, and the data has been reformatted to facilitate the use of available level rippers.

Emerald Coast Geometry Loaders

Segment 0

• Geometry loader starts at: 11098424
• Geometry loader pointer at: 11115716
• Geometry loader has 480 objects

Segment 1

• Geometry loader starts at: 12814040
• Geometry loader pointer at: 12820136
• Geometry loader has 169 objects

Segment 2

• Geometry loader starts at: 12806840
• Geometry loader pointer at: 12814016
• Geometry loader has 199 objects

Windy Valley Geometry Loaders

Segment 0

• Geometry loader starts at: 8406760
• Geometry loader pointer at: 8409580
• Geometry loader has 78 objects

Segment 1

• Geometry loader starts at: 8405856
• Geometry loader pointer at: 8406732
• Geometry loader has 24 objects

Segment 2

• Geometry loader starts at: 8399808
• Geometry loader pointer at: 8405832
• Geometry loader has 167 objects

Casinopolis Geometry Loaders

Segment 0

• Geometry loader starts at: 26773520
• Geometry loader pointer at: 26782172
• Geometry loader has 240 objects

Segment 1

• Geometry loader starts at: 62765888
• Geometry loader pointer at: 26773496
• Geometry loader has 211 objects

Segment 2

• Geometry loader starts at: 26762288
• Geometry loader pointer at: 26765864
• Geometry loader has 99 objects

Segment 3

• Geometry loader starts at: ??
• Geometry loader ends at: ??
• Geometry loader is 0x?? long

Ice Cap Geometry Loaders

Segment 0

• Geometry loader starts at: 10753248
• Geometry loader loader pointer at: 10755384
• Geometry loader loader has 59 objects

Segment 1

• Geometry loader starts at: 10750440
• Geometry loader pointer at: 10753224
• Geometry loader has 79 objects

Segment 2

• Geometry loader starts at: 10739784
• Geometry loader pointer at: 10750416
• Geometry loader has 295 objects

Twinkle Park Geometry Loaders

Segment 0

• Geometry loader starts at: 36406944
• Geometry loader pointer at: 36411240
• Geometry loader has 119 objects

Segment 1

• Geometry loader starts at: 36399960
• Geometry loader pointer at: 36406920
• Geometry loader has 193 objects

Segment 2

• Geomtery loader starts at: 36396792
• Geometry loader pointer at: 36399936
• Geometry loader has 87 objects

Speed Highway Geometry Loaders

Segment 0

• Geometry loader starts at: 3636248
• Geometry loader pointer at: 36380324
• Geometry loader has 474 objects

Segment 1

• Geometry loader starts at: 36360040
• Geometry loader pointer at: 36363220
• Geometry loader has 88 objects

Segment 2

• Geomtery loader starts at: 36352728
• Geometry loader pointer at: 36360012
• Geometry loader has 202 objects

Red Mountain Geometry Loaders

Segment 0

• Geomtery loader starts at: 31699976
• Geometry loader pointer at: 31720940
• Geometry loader has 582 objects

Segment 1

• Geometry loader starts at: 34369336
• Geometry loader pointer at: 34376548
• Geometry loader has 200 objects

Segment 2

• Geomtery loader starts at: 34355584
• Geometry loader pointer at: 34369312
• Geometry loader has 381 objects

Lost World Geometry Loaders

Segment 0

• Geometry loader starts at: 29588672
• Geometry loader pointer at: 29592428
• Geometry loader has 104 objects

Segment 1

• Geometry loader starts at: 29576504
• Geometry loader pointer at: 29588648
• Geometry loader has 337 objects

Segment 2

• Geometry loader starts at: 29575856
• Geometry loader pointer at: 29576480
• Geometry loader has 17 objects

Sand Hill Geometry Loader

• Geomtery loader starts at: 20168472
• Geometry loader pointer at: 20179824
• Geometry loader has 315 objects