Product(s):	InRoads, MX, GEOPAK
Version(s):	08.11.09+
Area:	Terrain Model
Original Author:	Jacquelyn Pettus, Bentley Technical Support Group

 

Problem:

I have imported contours graphically into my terrain model.  However, there are numerous vertices/linestrings in each contour. 

As a result, the density of triangles is high, the terrain model becomes very large, and processing times are increased.

Solution:

The solution for this is not enabled by default and requires the addition of two configuration variables:

• CIVIL_DTM_LINESTRING_FILTER_TOLERANCE
• CIVIL_DTM_LINESTRING_FILTER_MAXGAP

The Filter Tolerance represents the distance left and right of the chord that you wish to check within. The Filter Max Gap represents the horizontal length that you wish to check within. If a point falls within either tolerance, it will be ignored for triangulation.

The image below represents the same contour above with linestring thinning applied: