CLSN (File Format)

The CLSN format in Donkey Kong Country: Tropical Freeze is for static collision, usually used by world geometry.

This file format is almost completely documented Collision materials need experimentation to verify structure + figure out what the different flags do

Format

Type	Count	Name	Description
Form Descriptor	1	Collision Form Descriptor	Data type is CLSN
Chunk Descriptor	1	Vertices Chunk Descriptor	Data type is VERT
u32	1	Vertex Count
vector3	Vertex Count	Vertex Data
Chunk Descriptor	1	Collision Materials Chunk Descriptor	Data type is MTRL
u32	1	Collision Material Count
Collision Material	Collision Material Count	Collision Materials	Collision materials define collision properties.
Chunk Descriptor	1	Triangles Chunk Descriptor	Data type is TRIS
u32	1	Triangle Count
Collision Triangle	Triangle Count	Triangles Array
Chunk Descriptor	1	Tree Chunk Descriptor	Data type is TREE
u32	1	Leaf Node Count
Tree Leaf Node	Leaf Node Count	Leaf Node Array
End of file

Collision Material

Offset	Type	Count	Name	Description
0x0	u32	1	Unknown
0x4	u32	1	Unknown
0x8	u32	1	Unknown
0xC	u32	1	Unknown
0x10	u32	1	Unknown
0x14	End of collision material

Collision Triangle

Offset	Type	Count	Name	Description
0x0	u32	3	Vertex Indices
0xC	u16	1	Collision Material Index
0xE	u16	1	Unknown	This is probably just padding.
0x10	End of triangle

Tree Leaf Node

Offset	Type	Count	Name	Description
0x0	vector3	2	Axis-Aligned Bounding Box	Represented by a pair of points where point 1 is min and point 2 is max.
0x18	u32	1	Unknown
0x1C	u32	1	Unknown
0x20	u32	1	Unknown
0x24	End of leaf node