Fsx Autogen File Format
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Flight Simulator X Autogen File Format First draft March 2009
Compiled by Paavo Pihelgas
Contents I Preface.......................................................................................................................................................3 II Mandatory Sections.............................................................................................................................4 File Header..............................................................................................................................................................4 Version Information.............................................................................................................................................4 Height Profile..........................................................................................................................................................4 III Optional Sections................................................................................................................................5 Custom Texture Sheet.........................................................................................................................................5 Vegetation Polygons.............................................................................................................................................5 Vegetation Regions...............................................................................................................................................6 Generic Buildings..................................................................................................................................................6 Polyline Buildings.................................................................................................................................................7 Library Objects......................................................................................................................................................8 IV Additional Notes................................................................................................................................10
You are free to share and adapt contents of this document, as long as you attribute the authors and distribute the resulting work only under the same, similar or a compatible license.
____________________________________________________________________________________________________________ FSX Autogen File Format 2
I
Preface Among many other features, Flight Simulator 2002 introduced Autogen system. It's name is
derived from „automatically generated scenery“. For the first time, the whole terrain was covered with vegetation and buildings, greatly improving the flying experience. Full coverage was achieved by creating metadata file (so-called „Autogen file“ with .agn extension) for every texture used to render ground textures. Those metadata files carry information about building and vegetation placement for a specific the texture sheet. In Software Development Kit, Microsoft offers a tool – Autogen Annotator – for creating Autogen files. Its features and functionality are probably more than enough for most uses, but power users may need more flexibility. This document is aimed at them. The following pages describe the Autogen file format of Microsoft's Flight Simulator X.
____________________________________________________________________________________________________________ FSX Autogen File Format 3
II Mandatory Sections 1
File Header
Offset
Length
Format
0
4
char[4]
4
4
int
8
4
char[4]
2
Description Section identifier, always „RIFF“ Size of the remaining file Autogen identifier, always „AGNX“
Version Information
Offset
Length
Format
0
4
char[4]
4
4
int
Size of the remaining records in current section (4)
8
4
int
Version, always 13107
3
Description Section identifier, always „VERS“
Height Profile
Offset
Length
Format
Description
0
4
char[4]
4
4
int
Size of the remaining records in current section (16)
8
4
int
Percentage of 1-2 floor buildings
12
4
int
Percentage of 3-5 floor buildings
16
4
int
Percentage of 6-8 floor buildings
20
4
int
Percentage of 9-12 floor buildings
Section identifier, always „GBDD“
Remarks: • Height profile is used by Generic Buildings only. • Valid values for percentages are from 0 (0%) to 20 (100%).
____________________________________________________________________________________________________________ FSX Autogen File Format 4
III Optional Sections 1
Custom Texture Sheet
Offset
Length
Format
0
4
char[4]
4
4
int
8
variable
string
Description Section identifier, always „GBTE“ Size of the remaining records in current section Texture name (without the extension)
Remarks: • Custom texture sheet is used by Generic Buildings only.
2
Vegetation Polygons
Offset
Length
Format
Description
0
4
char[4]
4
4
int
Size of the remaining records in current section
8
...
...
Vegetation polygon subrecords
Section identifier, always „PREG“
For every group of polygons with a common GUID: Offset Length Format 0
4
char[4]
4
4
int
8
16
GUID
24
...
...
For each polygon: Offset Length
Subrecord identifier, always „PRDE“ Size of the remaining records in current section GUID of the vegetation type Polygons
Format
Description
0
4
int
Number of points
4
...
...
Points
For each point: Offset Length
Format
Description
Description
0
4
float
X coordinate in the LOD13 cell
4
4
float
Y coordinate in the LOD13 cell
____________________________________________________________________________________________________________ FSX Autogen File Format 5
Remarks: • Valid values for coordinates are from 0.0 to 1.0. • Upper left corner is at (0.0; 0.0) and lower right corner is at (1.0; 1.0).
3
Vegetation Regions
Offset
Length
Format
Description
0
4
char[4]
4
4
int
Size of the remaining records in current section
8
...
...
Vegetation region subrecords
Section identifier, always „VGRG“
For every group of regions with a common GUID: Offset Length Format 0
4
char[4]
4
4
int
8
16
GUID
24
...
...
For each region: Offset Length
Description
Subrecord identifier, always „VGRE“ Size of the remaining records in current section GUID of the vegetation type Regions
Format
Description
0
4
float
X coordinate of the NW point in the LOD13 cell
4
4
float
Y coordinate of the NW point in the LOD13 cell
8
4
float
Width
12
4
float
Height
Remarks: • Valid values for coordinates from -0.5 to 0.5. • Upper left corner is at (-0.5; -0.5) and lower right corner is at (0.5; 0.5). • Valid values for width and height are from -1 to 1 (1 = the whole span of the cell).
4
Generic Buildings
Offset
Length
Format
Description
0
4
char[4]
4
4
int
Size of the remaining records in current section
8
...
...
Generic building subrecords
Section identifier, always „GBLD“
____________________________________________________________________________________________________________ FSX Autogen File Format 6
For every group of Generic Buildings with a common GUID: Offset Length Format Description 0
4
char[4]
4
4
int
8
16
GUID
24
...
...
Subrecord identifier, always „GBLR“ Size of the remaining records in current section GUID of the vegetation type Buildings
For each Generic Building: Offset Length Format
Description
0
4
float
X coordinate of the first point of front side
4
4
float
Y coordinate of the first point of front side
8
4
float
X vector to the second point of front side
12
4
float
Y vector to the second point of front side
16
4
float
X coordinate of the third point
20
4
float
Y coordinate of the third point
Remarks: • Valid values for coordinates from -0.5 to 0.5. • Upper left corner is at (-0.5; -0.5) and lower right corner is at (0.5; 0.5). • Valid values for width and height are from -1 to 1 (1 = the whole span of the cell). • Default roofs („Default Autogen 1 roof“) are used if roof type GUID is empty.
5
Polyline Buildings
Offset
Length
Format
Description
0
4
char[4]
4
4
int
Size of the remaining records in current section
8
...
...
Vegetation polygon subrecords
Section identifier, always „PBLD“
For every group of Polyline Buildings with a common GUID: Offset Length Format Description 0
4
char[4]
4
4
int
8
16
GUID
24
...
...
Subrecord identifier, always „PBDE“ Size of the remaining records in current section GUID of the Polyline Building type Polyline Buildings
____________________________________________________________________________________________________________ FSX Autogen File Format 7
For each Polyline Building: Offset Length Format
Description
0
4
bool
Connect endpoints
4
4
int
Number of points
8
4
float
12
...
...
Building width Points
Remarks: • Valid values for building width are from 0.0 to 1.0, where 1.0 is LOD13 cell edge length. For each point: Offset Length
Format
Description
0
4
float
X coordinate in the LOD13 cell
4
4
float
Y coordinate in the LOD13 cell
Remarks: • Valid values for coordinates are from 0.0 to 1.0. • Upper left corner is at (0.0; 0.0) and lower right corner is at (1.0; 1.0).
6
Library Objects
Offset
Length
Format
Description
0
4
char[4]
4
4
int
Size of the remaining records in current section
8
...
...
Library object subrecords
Section identifier, always „AGN2“
For every group of Library Objects with a common GUID: Offset Length Format Description 0
4
char[4]
4
4
int
8
16
GUID
24
...
...
For each library object: Offset Length Format
Subrecord identifier, always „A2GE“ Size of the remaining records in current section GUID of the library object Library objects
Description
0
4
float
X coordinate of the first point of front side
4
4
float
Y coordinate of the first point of front side
8
4
float
X vector to the second point of front side
____________________________________________________________________________________________________________ FSX Autogen File Format 8
12
4
float
Y vector to the second point of front side
16
4
float
X coordinate of the third point
20
4
float
Y coordinate of the third point
Remarks: • Valid range of coordinates is from -0.5 to 0.5. • Upper left corner is at (-0.5; -0.5) and lower right corner is at (0.5; 0.5). • Valid range of vectors is from 0.0 to 1.0. Vector (1.0; 0.0) aligns face with x-axis.
____________________________________________________________________________________________________________ FSX Autogen File Format 9
IV Additional Notes •
All Autogen files created with Annotator tool have a specific property in Polyline Buildings set to 1. During the research, it was discovered that this parameter controls if beginning and end of a building are connected. This previously unknown feature widens the use of Polyline Buildings.
____________________________________________________________________________________________________________ FSX Autogen File Format 10
Compiled by Paavo Pihelgas
Contents I Preface.......................................................................................................................................................3 II Mandatory Sections.............................................................................................................................4 File Header..............................................................................................................................................................4 Version Information.............................................................................................................................................4 Height Profile..........................................................................................................................................................4 III Optional Sections................................................................................................................................5 Custom Texture Sheet.........................................................................................................................................5 Vegetation Polygons.............................................................................................................................................5 Vegetation Regions...............................................................................................................................................6 Generic Buildings..................................................................................................................................................6 Polyline Buildings.................................................................................................................................................7 Library Objects......................................................................................................................................................8 IV Additional Notes................................................................................................................................10
You are free to share and adapt contents of this document, as long as you attribute the authors and distribute the resulting work only under the same, similar or a compatible license.
____________________________________________________________________________________________________________ FSX Autogen File Format 2
I
Preface Among many other features, Flight Simulator 2002 introduced Autogen system. It's name is
derived from „automatically generated scenery“. For the first time, the whole terrain was covered with vegetation and buildings, greatly improving the flying experience. Full coverage was achieved by creating metadata file (so-called „Autogen file“ with .agn extension) for every texture used to render ground textures. Those metadata files carry information about building and vegetation placement for a specific the texture sheet. In Software Development Kit, Microsoft offers a tool – Autogen Annotator – for creating Autogen files. Its features and functionality are probably more than enough for most uses, but power users may need more flexibility. This document is aimed at them. The following pages describe the Autogen file format of Microsoft's Flight Simulator X.
____________________________________________________________________________________________________________ FSX Autogen File Format 3
II Mandatory Sections 1
File Header
Offset
Length
Format
0
4
char[4]
4
4
int
8
4
char[4]
2
Description Section identifier, always „RIFF“ Size of the remaining file Autogen identifier, always „AGNX“
Version Information
Offset
Length
Format
0
4
char[4]
4
4
int
Size of the remaining records in current section (4)
8
4
int
Version, always 13107
3
Description Section identifier, always „VERS“
Height Profile
Offset
Length
Format
Description
0
4
char[4]
4
4
int
Size of the remaining records in current section (16)
8
4
int
Percentage of 1-2 floor buildings
12
4
int
Percentage of 3-5 floor buildings
16
4
int
Percentage of 6-8 floor buildings
20
4
int
Percentage of 9-12 floor buildings
Section identifier, always „GBDD“
Remarks: • Height profile is used by Generic Buildings only. • Valid values for percentages are from 0 (0%) to 20 (100%).
____________________________________________________________________________________________________________ FSX Autogen File Format 4
III Optional Sections 1
Custom Texture Sheet
Offset
Length
Format
0
4
char[4]
4
4
int
8
variable
string
Description Section identifier, always „GBTE“ Size of the remaining records in current section Texture name (without the extension)
Remarks: • Custom texture sheet is used by Generic Buildings only.
2
Vegetation Polygons
Offset
Length
Format
Description
0
4
char[4]
4
4
int
Size of the remaining records in current section
8
...
...
Vegetation polygon subrecords
Section identifier, always „PREG“
For every group of polygons with a common GUID: Offset Length Format 0
4
char[4]
4
4
int
8
16
GUID
24
...
...
For each polygon: Offset Length
Subrecord identifier, always „PRDE“ Size of the remaining records in current section GUID of the vegetation type Polygons
Format
Description
0
4
int
Number of points
4
...
...
Points
For each point: Offset Length
Format
Description
Description
0
4
float
X coordinate in the LOD13 cell
4
4
float
Y coordinate in the LOD13 cell
____________________________________________________________________________________________________________ FSX Autogen File Format 5
Remarks: • Valid values for coordinates are from 0.0 to 1.0. • Upper left corner is at (0.0; 0.0) and lower right corner is at (1.0; 1.0).
3
Vegetation Regions
Offset
Length
Format
Description
0
4
char[4]
4
4
int
Size of the remaining records in current section
8
...
...
Vegetation region subrecords
Section identifier, always „VGRG“
For every group of regions with a common GUID: Offset Length Format 0
4
char[4]
4
4
int
8
16
GUID
24
...
...
For each region: Offset Length
Description
Subrecord identifier, always „VGRE“ Size of the remaining records in current section GUID of the vegetation type Regions
Format
Description
0
4
float
X coordinate of the NW point in the LOD13 cell
4
4
float
Y coordinate of the NW point in the LOD13 cell
8
4
float
Width
12
4
float
Height
Remarks: • Valid values for coordinates from -0.5 to 0.5. • Upper left corner is at (-0.5; -0.5) and lower right corner is at (0.5; 0.5). • Valid values for width and height are from -1 to 1 (1 = the whole span of the cell).
4
Generic Buildings
Offset
Length
Format
Description
0
4
char[4]
4
4
int
Size of the remaining records in current section
8
...
...
Generic building subrecords
Section identifier, always „GBLD“
____________________________________________________________________________________________________________ FSX Autogen File Format 6
For every group of Generic Buildings with a common GUID: Offset Length Format Description 0
4
char[4]
4
4
int
8
16
GUID
24
...
...
Subrecord identifier, always „GBLR“ Size of the remaining records in current section GUID of the vegetation type Buildings
For each Generic Building: Offset Length Format
Description
0
4
float
X coordinate of the first point of front side
4
4
float
Y coordinate of the first point of front side
8
4
float
X vector to the second point of front side
12
4
float
Y vector to the second point of front side
16
4
float
X coordinate of the third point
20
4
float
Y coordinate of the third point
Remarks: • Valid values for coordinates from -0.5 to 0.5. • Upper left corner is at (-0.5; -0.5) and lower right corner is at (0.5; 0.5). • Valid values for width and height are from -1 to 1 (1 = the whole span of the cell). • Default roofs („Default Autogen 1 roof“) are used if roof type GUID is empty.
5
Polyline Buildings
Offset
Length
Format
Description
0
4
char[4]
4
4
int
Size of the remaining records in current section
8
...
...
Vegetation polygon subrecords
Section identifier, always „PBLD“
For every group of Polyline Buildings with a common GUID: Offset Length Format Description 0
4
char[4]
4
4
int
8
16
GUID
24
...
...
Subrecord identifier, always „PBDE“ Size of the remaining records in current section GUID of the Polyline Building type Polyline Buildings
____________________________________________________________________________________________________________ FSX Autogen File Format 7
For each Polyline Building: Offset Length Format
Description
0
4
bool
Connect endpoints
4
4
int
Number of points
8
4
float
12
...
...
Building width Points
Remarks: • Valid values for building width are from 0.0 to 1.0, where 1.0 is LOD13 cell edge length. For each point: Offset Length
Format
Description
0
4
float
X coordinate in the LOD13 cell
4
4
float
Y coordinate in the LOD13 cell
Remarks: • Valid values for coordinates are from 0.0 to 1.0. • Upper left corner is at (0.0; 0.0) and lower right corner is at (1.0; 1.0).
6
Library Objects
Offset
Length
Format
Description
0
4
char[4]
4
4
int
Size of the remaining records in current section
8
...
...
Library object subrecords
Section identifier, always „AGN2“
For every group of Library Objects with a common GUID: Offset Length Format Description 0
4
char[4]
4
4
int
8
16
GUID
24
...
...
For each library object: Offset Length Format
Subrecord identifier, always „A2GE“ Size of the remaining records in current section GUID of the library object Library objects
Description
0
4
float
X coordinate of the first point of front side
4
4
float
Y coordinate of the first point of front side
8
4
float
X vector to the second point of front side
____________________________________________________________________________________________________________ FSX Autogen File Format 8
12
4
float
Y vector to the second point of front side
16
4
float
X coordinate of the third point
20
4
float
Y coordinate of the third point
Remarks: • Valid range of coordinates is from -0.5 to 0.5. • Upper left corner is at (-0.5; -0.5) and lower right corner is at (0.5; 0.5). • Valid range of vectors is from 0.0 to 1.0. Vector (1.0; 0.0) aligns face with x-axis.
____________________________________________________________________________________________________________ FSX Autogen File Format 9
IV Additional Notes •
All Autogen files created with Annotator tool have a specific property in Polyline Buildings set to 1. During the research, it was discovered that this parameter controls if beginning and end of a building are connected. This previously unknown feature widens the use of Polyline Buildings.
____________________________________________________________________________________________________________ FSX Autogen File Format 10
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