CDT command
Perform a 2d conforming Delaunay triangulation on a selection of triangulation points, constraints and boundaries.
Access methods
8 Toolbar:
8 Menu: ComputationalCAD Triangulate
7 Command entry: CC:CDT
Dialog
Select triangulation points:
Select the triangulation points.
This is optional if constraints will be selected. Expects a selection of AutoCAD
3d point entities.
Select constraints:
Select the constraints. Optional if triangulation points
have been selected. Expects a selection of non-overlapping AutoCAD 3d
line entities. If lines have been selected, the following dialog
occurs:
Number of feasible constraint
violations:
Specify the number of
feasible edge violations to stop the edge insertion iteration. Expects an
integer greater or equal 0. Default is 0.
Select boundaries:
Select the boundaries (optional). Expects a selection of
closed AutoCAD 2d polyline entities.
[The triangulation starts.]
Insert on layer [Current/specify Name]
:
<Current>:
The triangles will lie on the current layer. (Default)
<specify Name>:
The following dialog is
displayed:
Specify layer
name:
Enter the name of the layer
the triangles shall be added to. If the layer does not exist, it will be
generated.
Insert as block? <Yes, No>
:
<Yes>:
The following dialog is
displayed:
Specify block name:
Enter the name of the block the triangles shall be added to. If the block does
not exist, it will be generated.
<No>: The triangles will be inserted in the model space. (Default)
Notes
Please read the comments on the input data and the general restrictions.
Example
Figure 37: Rendered view on a pure point data Delaunay triangulation of app. 54k points
Command line prompt:
Initial triangulation:
----------------------
Initial triangulation points : 54327
Initial constraints : 0
Number of boundary regions : 0
Initial boundary segments : 0
Triangulation results
---------------------
Invalid triangulation points : 0
Invalid constraints/boundaries: 0
Degenerate triangles : 0
Steiner points added : 0
Iterations for conformity : 0
Total triangulation points : 54327
Total triangles created : 107712
Total time elapsed : 2234 ms
Figure 38: Wireframe view on a pure constraint Delaunay triangulation of app. 45k contour line constraints
Command line prompt:
Initial triangulation:
----------------------
Initial triangulation points : 0
Initial constraints : 45347
Number of boundary regions : 0
Initial boundary segments : 0
Triangulation results
---------------------
Invalid triangulation points : 45073
Invalid constraints/boundaries: 2
Degenerate triangles : 0
Steiner points added : 17900
Iterations for conformity : 13
Total triangulation points : 63521
Total triangles created : 126523
Total time elapsed : 12460 ms