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Polylines

A Polyline is how Contours are represented.

Each line will contain one data object (e.g. one point).
The data parameters for the object are separated by commas and are in the format:
NAME = VALUE
(e.g. X=123.456)
A line ending with a & means that it is continued onto the next line.
Data parameters are separted by a comma and can appear in ANY order.


[POLYLINES]
Surface="Surface 1"
Name="88.2",Layer="Contours",Entity=2415 &
 X=10224.150,Y=20135.956,Z=88.200 &
 X=10224.659,Y=20135.731,Z=88.200,Tain=0.036,Tout=-0.003 &
 X=10229.973,Y=20133.622,Z=88.200,Tain=-0.009,Tout=0.535 &
 X=10230.041,Y=20133.540,Z=88.200,Tain=-0.035,Tout=0.001 &
 X=10232.121,Y=20130.841,Z=88.200,Tain=0.006,Tout=-0.060 &
 X=10232.364,Y=20130.567,Z=88.200

Surface
The name of the surface for the polylines, this must match one of the surface names.
Polylines are created from the triangles on that surface.
See the Surfaces section for more info.

Layer
The layer name on which the polyline resides.
This layer name must appear in the list of Layers in the {LAYERS] section.
See Layers data format for more information.

Entity
A unique polyline id number.
When polyline height text is created, this number is used to 'link' trhe text to its' polyline.

Vertex X, Y
Vertex co-ordinates as X = Easting, Y = Northing in ground co-ordinates (metres).

Vertex Height - Z
The vertex height value for the polyline/contour in ground units (metres).

Tangent In - Tain
The tan of the angle of the contour line as it approaches the vertex.
The Tain and Tout are used to 'smooth' the contours when drawn.

Tangent Out - Tout
The tan of the angle of the contour line as it departs the vertex.
The Tain and Tout are used to 'smooth' the contours when drawn.