ApusGameEngine/AEM specification.txt at engine5 · Cooler2/ApusGameEngine · GitHub

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AEM (Apus Engine Mesh) file format specification


Data types:

1. Scalar
2. 2d vector
3. 3d vector
4. Quaternion
5. Unit 3d vector
6. Color
7. Bone (structure)
8. Bone weight (structure)

Encodings:

1. Single FP (absolute value)
2. Half FP (absolute value)
3. 16-bit range
4. 12-bit range
5. 8-bit range
6. 556 packed 3d range (ultra low quality)
7. 16-bit packed unit 3d-vector
8. 12-bit packed unit 3d-vector (ultra low quality)
9. 32bit ARGB color
10. 24bit RGB color
11. 4444 ARGB color
12. 565 RGB color
13. 556 packed bone weight (16-bit structure)
14. 888 packed bone weight (24-bit structure)
15. 8-bit unsigned integer
16. 16-bit signed integer
17. FlexInt
18. Index (FlexInt)


Chunk type: XXXX XYYY, where XXXXX - chunk type and YYY - encoding

1. Vertex attributes:
 0 Position 2D (1,2,3,4,5,18)
 1 Position 3D (1,2,3,4,5,6,18)
 2 Normal (1,2,7,8,18)
 3 Tangent (1,2,7,8,18)
 4 Texture coordinates (1,2,3,4,5,18)
 5 Bone weights (13,14,18)
 6 Color (9,10,11,12,18)
 7 Custom attribute (scalar) (1,2,3,18)
 8 Custom attribute (2D) (1,2,3,4,5,18)
 9 Custom attribute (3D) (1,2,3,4,5,6,18)
 10 Custom attribute (color) (9,10,11,12,18)

2. Indexed mesh data

3. Special
 31.0 - Mesh info
 31.1 - Mesh name