RND [Hack64 Wiki]

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====== RND ======

This is a format used for 3D models. It has the file extension //.rnd//

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**Note: This page contains incomplete information.**
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===== Header =====

The header of the file takes up the first 0x40 bytes of the file.

^Offset^#Bytes^Description^
|0x00|0x26|String name of the file|
|0x26|2| |
|0x28|2| Number of points (Little Endian) |
|0x2A|2| Number of vertices (LE) |
|0x2C|2| Number of triangles (LE) |
|0x2E|2| Number of materials (LE) |
|0x30|0x10|  |

===== Points =====

Following the header are the points of the models. Each point is 6 bytes long.

^Offset^#Bytes^Description^
|0x00|2|X coordinate (signed short, LE)|
|0x02|2|Y coordinate (signed short, LE)|
|0x04|2|Z coordinate (signed short, LE)|

===== Vertices =====

Following the points are the vertices. Each vertex is 10 bytes long.

^Offset^#Bytes^Description^
|0x00|2|U tex coordinate (0-255, LE)|
|0x02|2|V tex coordinate (0-255, LE)|
|0x04|1|Red color value (0-255)|
|0x05|1|Green color value (0-255)|
|0x06|1|Red color value (0-255)|
|0x07|1|Alpha? Not used?|
|0x08|2|Point ID (signed short, LE)|

Note: The UV coordinates are not in the N64's s10.5 format. To get the proper U/V value, you just simply divide by 255.

===== Triangles =====

Following the vertices are the triangles. Each triangle is 8 bytes long.

^Offset^#Bytes^Description^
|0x00|2|Vertex 1 ID (LE)|
|0x02|2|Vertex 2 ID (LE)|
|0x04|2|Vertex 3 ID (LE)|
|0x06|2|Material ID (LE)|

===== Materials =====

Following the triangles are the materials. Every RND model must have at-least 1 material, even if it has to be a dummy material. Each material is 0x43 bytes long.

^Offset^#Bytes^Description^
|0x00|0x20|String name of the material|
|0x20|4|4 character string name of the [[supercross_2000:shpn|SHPN]] texture|
|0x24|0x1F| |

===== Other structures =====

There are many other structures within the RND file that are currently not documented. Please update this page when new information is found.
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