Tree format (.ntr) description

The file completely describes the cells geometry.

• the file starts with header lines describing the types of segment points present in the file
• this section is closed with a line of ********************
• the next line contains the number of points
• then each line contains the description of one point
• Each record consist of the following fields:
• X, Y, Z coordinates (in micrometer)
• diameter (in micrometer)
• type of point
• 1= tree origin
• 7=branchpoint
• 4=continuation point
• 8=end point
•  type of segment: identifies the segment types described in the header
• the points are described sequentially after an endpoint the next point is connected to the next unfinished branchpoint
• e.g.
•                   6 7 8 9
  1 2 3 4 5 <
                   10 11 12 13 14
• The description is 1,2,3,4,5(bp),6,7,8,9(ep),10,11,12,13,14(ep)