GND - Ground Field File

October 27th, 2005

Ground File, this file contains every polygon, textures and lightmaps of the ground.

*	Field	Size		Type	Description
0	Header	6	bytes	Integer	GRGN..
6	Size X	4	bytes	Integer	Size of field
10	Size Y	4	bytes	Integer	Size of field
14	Ratio	4	bytes	Float	Proportion Ratio usually 10.0
18	Texture Count	4	bytes	Integer	Number of textures used
22	Size of Texture	4	bytes	Integer	Size of Texture Path
{	Textures (Texture Path Size/2)
0	Path	40	bytes	Char	Path to file
40	??	40	bytes	Char	-
}
0	Nº of Lightmaps	4	bytes	Integer	-
4	Grid Size X	4	bytes	Integer	Size of lightmap grid X
8	Grid Size Y	4	bytes	Integer	Size of lightmap grid Y
12	Grid Size Cell	4	bytes	Integer	Number of cells by grid
{	Lightmaps (Header + Texture + Unknown + Tiles Offset )
0	Brightness	64	bytes	char	8*8 Grid Bright Values
64	Color RGB	192	bytes	char	8*8 Grid Color Values (RGB Triplets)
}
0	Nº of Tiles	4	bytes	Integer	-
{	Tiles (Header + Texture + Unknown Offset )
0	Texture Start	4	bytes	Float	Left Bottom
4	Texture Start	4	bytes	Float	Right Bottom
8	Texture Start	4	bytes	Float	Left Top
12	Texture Start	4	bytes	Float	Right Top
16	Texture End	4	bytes	Float	Left Bottom
20	Texture End	4	bytes	Float	Right Bottom
24	Texture End	4	bytes	Float	Left Top
28	Texture End	4	bytes	Float	Right Top
32	Texture	2	bytes	Integer	Nº of texture used
34	Lightmap	2	bytes	Integer	Nº of lightmap used
36	Tile Color	4	bytes	char	Tile Tint Color (RGBA)
}
{	Cubes (Header + Texture + Unknown + Tiles + Lightmaps Offset )
0	Cell	4	bytes	Float	Left Bottom
4	Cell	4	bytes	Float	Right Bottom
8	Cell	4	bytes	Float	Left Top
12	Cell	4	bytes	Float	Right Top
16	Tile Up	4	bytes	Integer	Number of Tile
20	Tile Side	4	bytes	Integer	Number of Tile
20	Tile Aside	4	bytes	Integer	Number of Tile
}

Info :
- - Designs a block type
{ } Designs a loop block
You can adjust scale of texture with Texture Start and Texture End

Nº of cubes are designed by Size X * Size Y

Credits
deufeufeu / ender (previous research)
Victor-san (Update)

Filed under Uncategorized |

4 Responses to “GND - Ground Field File”

Paul on July 11, 2006 12:31 pm
Hi,
I think Texture Start and End in a Tile section corresponds to the 2D coordinates of the texture to be applied.

for example, if the texture is 256×256,
0.5 0.75 0.5 0.75 1.0 1.0 0.75 0.75 would be a square in the texture defined by :
(128,255)-> (192,255)->(192,192)->(128,192)

Am I right ?
Ximo(Offline) on July 12, 2006 1:37 am
Yes, texture coordinates are following standard texturing techniques, so 1.0 it’s end (max size) and 0 the start, you can also make mirroring by flipping this values.
VictorSan on July 29, 2006 3:35 am
Hello,

36 ?? 4 bytes Integer ??

-> I think that this field is really a 4 unsigned char field.

If it´s taken as an integer, it´s usually a big number… i splited it into 4 unsigned chars. The result is 255 255 255 255, it repeats in every tile. I think it´s a RGBA value for that tile.

The same strange value appears in the cubes, in the “tile” fields… i don´t know it it´s the same.

Ximosoft give me credit or i kill you :D .

Akuchimoya
Estx on January 21, 2007 8:03 pm
VictorSan, Ximosoft:

The value is most likely ARGB. Alpha comes first in almost every programming language.