TIN Files
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This is the approved revision of this page, as well as being the most recent.
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This is the approved revision of this page, as well as being the most recent.
TIN files are used for storing Triangulated Irregular Networks. The TIN file format is shown below and a sample file is shown after. The TIN file format can be used to import a simple set of XYZ coordinates since the triangle information (beginning with the TRI card) does not need to be present. If there is a file of XYZ coordinates, only add the TIN, BEGT, and VERT nv cards to the top of the file and the ENDT card at the end.
TIN /* File type identifier */ BEGT /* Beginning of TIN group */ TNAM name /* Name of TIN */ TCOL id /* TIN material id */ VERT nv /* Beg. of vertices */ x1 y1 z1 lf1 /* Vertex coords. */ x2 y2 z2 lf2 . . . xnv ynv znv lfnv TRI nt /* Beg. of triangles */ v11 v12 v13 /* Triangle vertices */ v21 v22 v23 . . . vnt1 vnt2 vnt3 ENDT /* End of TIN group */
Sample TIN File:
TIN BEGT TNAM Aspen TCOL 255 255 255 VERT 408 0.0 3.1 7.8 0 5.3 8.7 4.0 1 . . 2.4 4.4 9.0 1 TRI 408 5 1 4 4 1 2 . . 4 2 3 ENDT
Cards Used in the TIN File
| Card Type | TIN |
|---|---|
| Card ID | 3000 |
| Description | File type identifier. Must be on first line of file. No fields. |
| Required | YES |
| Card Type | BEGT |
|---|---|
| Card ID | 3000 |
| Description | Marks the beginning of a group of cards describing a TIN. There should be a corresponding ENDT card at a latter point in the file. No fields. |
| Required | YES |
| Card Type | TNAM | ||
|---|---|---|---|
| Description | Provides a name to be associated with the TIN. | ||
| Required | NO | ||
| Format | TNAM name | ||
| Sample | TNAM aspen
| ||
| Field | Variable | Value | Description |
| 1 | name | str | The name of the TIN. |
| Card Type | TCOL | ||
|---|---|---|---|
| Description | Defines a default color for the triangles of the TIN | ||
| Required | NO | ||
| Format | TCOL color_red color_green color_blue | ||
| Sample | TCOL 255 255 255
| ||
| Field | Variable | Value | Description |
| 1 | color_red | 0–255 | The red color component of TIN triangles. |
| 2 | color_green | 0–255 | The green color component of TIN triangles. |
| 3 | color_blue | 0–255 | The blue color component of TIN triangles. |
| Card Type | MAT | ||
|---|---|---|---|
| Description | Associates a material id with the TIN. This is typically the id of the material which is below the TIN. | ||
| Required | NO | ||
| Format | MAT id | ||
| Sample | MAT 3 | ||
| Field | Variable | Value | Description |
| 1 | id | + | The material ID. |
| Card Type | VERT | ||
|---|---|---|---|
| Description | Lists the vertices in the TIN | ||
| Required | YES | ||
| Format | VERT nv x1 y1 z1 lf1 x2 y2 z2 lf2 . . xnv ynv znv lfnv | ||
| Sample | VERT 4
| ||
| Field | Variable | Value | Description |
| 1 | nv | + | The number of vertices in the TIN |
| 2–4 | x,y,z | ± | Coords. of vertex |
| 5 | lf | 0,1 | Locked / unlocked flag for vertex (optional). 0=unlocked, 1=locked. Repeat fields 2–5 nv times. |
| Card Type | TRI | ||
|---|---|---|---|
| Description | Lists the triangles in the TIN | ||
| Required | NO ( a set of triangles can be generated from the vertices) | ||
| Format | TRI nt v11 v12 v13 v21 v23 v23 . . vnt1 vnt2 vnt3 | ||
| Sample | TRI 4
| ||
| Field | Variable | Value | Description |
| 1 | nt | + | The number of triangles in the TIN. |
| 2–4 | v1,v2,v3 | + | Vertices of triangle listed in a counter-clockwise order. Repeat nt times. |
| Card Type | ENDT |
|---|---|
| Card ID | 3000 |
| Description | Marks the end of a group of cards describing a TIN. There should be a corresponding BEGT card at a previous point in the file. No fields. |
| Required | YES |
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