TIN command

Creates a TIN Surface.

BricsCAD Pro; BricsCAD Mechanical; BricsCAD BIM

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Description

Creates a TIN Surface from an imported point files or by placing new points.

A TIN Surface is a three-dimensional geometric representation of a terrain or a civil feature, which also includes its representation with triangles, contours, slopes and elevation ranges.

The algorithm connects the nearest lying points into triangles that form a Triangular Irregular Network (TIN), using the Delaunay triangulation method.

The user can affect the way points are connected by adding boundaries and breaklines to the TIN Surface. Triangles always follow specified boundaries and breaklines and never intersect them. The TIN Surface can also be edited with other options available in the TINEDIT command.

A TIN Surface is dynamically linked to its input data, while other Civil entities, such as Gradings, Alignments and Corridors are dynamically linked to the TIN Surface.

Method

A TIN surface can be created from different type of input data:

  • from CAD elements (points and linear entities) and Civil points,
  • from imported point files,
  • from Civil points, for which we specify the position and elevation in the drawing,
  • from 3D Face elements,
  • from Point Cloud element,
  • from a specified point group.

Select a set of points, polylines, 3D faces or a point cloud in the drawing to create a TIN surface. Points are added to the surface as TIN points, 3D polylines are added to the surface as breaklines. Linear entities can be added to the TIN surface as breaklines, edges or points.

Options within the command

Import from file

Creates a TIN surface from an imported points file in text file format (.TXT), comma-delimited file format (.CSV) and other text formats where the XYZ coordinates in the input file are separated by any delimiter. Multiple point files could be selected to create a TIN surface.

Enter point file delimiter
Defines another point file delimiter.
place Points

Creates a TIN surface by placing at least three points.

create from Faces
Creates a TIN surface by selecting 3D faces. You may choose to add edges of 3D faces as breaklines (Y) or to create TIN Surface only with points of 3D Faces (N).
Create from Point Cloud
Creates a TIN surface from a Point Cloud.
Simplify the TIN surface?
Yes: simplifies the TIN surface created from an imported points file, and from a Point Cloud by reducing the points density. The point filtration is defined by setting values for the radius or simplification step, and for elevation difference.

No: A TIN Surface is created from all points in the input file or in Point Cloud.

Note: After the first iteration of the simplification, a report is displayed on the command line stating the number of points before simplification, the number of removed points and the number of points after simplification. In the next step, the user can choose between options “Simplify again” or "Create TIN Surface”.
Create TIN surface
Creates the TIN surface.
cLip polygon
Creates TIN Surface only in the area defined by the CLIP polygon (a closed polyline).
Note: There is the option to remove the crossed breaklines, if any.