ICN Files

ICN files are 3d models rendered in the Content Browser menu. They contain vertex data, animation data, and a texture.

ICN Header

Offset	Length	Description
0x00	0x04	Magic (0x10000)
0x04	0x04	Animation shape count
0x08	0x04	Texture type
0x0C	0x04	?
0x10	0x04	Vertex count

Geometry

Offset	Length	Description
0x00	Vertex count	Vertex

Animation Data

Animation Header

Offset	Length	Description
0x00	0x04	Tag (0x01)
0x04	0x04	Frame length
0x08	0x04	Animation speed (float)
0x0C	0x04	Play
0x10	0x04	Frame count

Animation Frames

Offset	Length	Description
0x00	Frame count	Array of Frames

Texture

The texture is an optionally-compressed 128x128px ABGR1555 image.

When the Texture Type in the header is 0x07, the texture is uncompressed and can be used as a pixel buffer. Otherwise it must be RLE decompressed.

Compressed Texture

Offset	Length	Description
0x00	0x04	Compressed Size
0x04	Compressed Size	Pixel (unsigned 16 bit integer)

RLE decompression algorithm

Offset = 0
Index = 0

WHILE Offset < Compressed Size
    Repetitions = Compressed[Offset]
    Offset = Offset + 1
    
    IF Repetitions < 0xFF00
        // Repeat same pixel
        Pixel = Compressed[Offset]
        Offset = Offset + 1
        
        LOOP < Repetitions
            Texture[Index] = Pixel
            Index = Index + 1
    ELSE
        // Unique pixels
        LOOP <= Repetitions
            Pixel = Compressed[Offset]
            Offset = Offset + 1
            Texture[Index] = Pixel
            Index = Index + 1

Data Types

Vertex

Offset	Length	Description
0x00	0x08 * Animation shape count	Interleaved list of Positions for each animation shape
*	0x08	Normal
*	0x04	UV
*	0x04	Color

Position

Offset	Length	Description
0x00	0x02	X (integer)
0x02	0x02	Y (integer)
0x04	0x02	Z (integer)
0x06	0x02	W (unsigned int)

Normal

Offset	Length	Description
0x00	0x02	X (integer)
0x02	0x02	Y (integer)
0x04	0x02	Z (integer)
0x06	0x02	W (unsigned int)

UV

Offset	Length	Description
0x00	0x02	U (unsigned int)
0x02	0x02	V (unsigned int)

Color

Offset	Length	Description
0x00	0x01	R
0x01	0x01	G
0x02	0x01	B
0x03	0x01	A

Frame

Offset	Length	Description
0x00	0x04	Shape ID
0x04	0x04	Key count
0x08	0x08	?
0x10	0x08 * Key count	Frame Key

Frame Key

Offset	Length	Description
0x00	0x04	Time (float)
0x04	0x04	Value (float)