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CAD tip CAD tip # 5936:

Question CAD 
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Q - question

FLT file format for model breaklines.

A - answer AutoCAD Civil 3D uses a text file with the .FLT extension to define breaklines (edges) for the digital terrain model. You can create this file in your text editor (e.g. Notepad).

Each breakline in this file starts with the code of the breakline type (most often "S"-Standard, "P"-Proximity) and contains the list of its X-Y-Z coordinates. At the end of line you can set the name of the breakline.

An example of a FLT file:

# Breakline file for Prague tunnel 
P1542.258750 179.318779 0.000000 Edge1-pavement  
1190.721102 350.527660 0.000000  
860.816542 446.044194 0.000000  
588.600214 619.055276 0.000000  
S1529.639450 179.318779 100.250000 Edge2
1188.918348 357.736453 101.420000  
1021.998725 330.653391 103.530000  
594.008485 610.044279 102.870000  
761.574952 744.929530 104.780000  
To define breaklines by point numbers (not point coordinates) you can use the transparent function 'PN which converts "point number" to "point coordinate XYZ".
100% *  CAD 
11.1.2008    13029×  
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applies to: Civil 3D 2008 ·

See also:
Tip 14093:3D terrain model of any place in Czechia - elevation data by the Czech Land Survey Office (CUZK) into Civil 3D.
Tip 14056:How to move blocks in the Z axis to the terrain model surface?
Tip 11511:Assigning elevations to 2D contours (isolines).
Tip 11068:Unknown icon in an AutoCAD Civil 3D project.
Tip 10682:Automatic classification of drawing objects by their properties.

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