Atlas: Created page with "'''EFC''' is a file format found in Mario Kart Arcade GP DX. It defines culling effect areas used in tracks, and it functions identically to ABC files. = File Format = The file byte order is always little endian. == File Header == The file starts with a header that is 0x10 bytes long. {|class=wikitable ! Offset !! Type !! Description |- | 0x00 || Char[4] || '''File magic'''. Always ''EFFC'' in ASCII. |- | 0x04 || Int32 || Always 1. Maybe version? The game chec..."

2025-07-06T01:56:56Z

Created page with "'''EFC''' is a file format found in Mario Kart Arcade GP DX. It defines culling effect areas used in tracks, and it functions identically to ABC files. = File Format = The file byte order is always little endian. == File Header == The file starts with a header that is 0x10 bytes long. {|class=wikitable ! Offset !! Type !! Description |- | 0x00 || Char[4] || '''File magic'''. Always ''EFFC'' in ASCII. |- | 0x04 || Int32 || Always 1. Maybe version? The game chec..."

New page

'''EFC''' is a file format found in [[Mario Kart Arcade GP DX]]. It defines culling effect areas used in tracks, and it functions identically to [[ABC]] files.

= File Format =
The file byte order is always little endian.

== File Header ==
The file starts with a header that is 0x10 bytes long.

{|class=wikitable
! Offset !! Type !! Description
|-
| 0x00 || Char[4] || '''File magic'''. Always ''EFFC'' in ASCII.
|-
| 0x04 || Int32 || Always 1. Maybe version? The game checks if this value is 1, otherwise it won't read the file.
|-
| 0x08 || Int32 || '''Number of [[#Culling Areas|Culling Areas]]''' ('''N''').
|-
| 0x0C || Byte[4] || '''Padding'''.
|-
| 0x10 || colspan=2 {{unknown|End of header, start of Culling Areas}}
|}

== Culling Areas ==
After the header, there are '''N''' 0x40-byte culling areas. Each area corresponds to each section of the track's [[EFD]] file, and it is made of a single 4x4 matrix that is used to transform the current position of the camera's target. The game checks once per frame if the transformed position of each area lies within a -0.5f to 0.5f AABB cube to determine the culling status.

{|class=wikitable
|+ Culling Area
! Offset !! Type !! Description
|-
| 0x00 || Float[16] || '''4x4 matrix'''.
|}

= Tools =
The following tools can handle EFC files:
* (none)

[[Category:Mario Kart Arcade GP DX File Formats]]

EFC (File Format) - Revision history