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Force triangle edges along a given line and ensure accurate ground model levels by adding breaklines.
Type:
Tutorial
Length:
4 min.
Transcript
00:03
It is often necessary to edit a mesh using various objects to provide more detail
00:09
and improve the representation of the underlying topography.
00:13
These mesh editing objects can be manually added or taken from external files,
00:19
layers displayed in the GeoPlan view, or objects within the network.
00:25
Breaklines are used to force triangle edges along a given line.
00:31
These can be used to enhance the detail of the mesh,
00:34
or to ensure that the ground model topography is represented more accurately by the mesh.
00:41
For example, they can help to pick out the tops of embankments or the bottom of channels.
00:48
In this example, a mesh has already been generated using the default parameters.
00:54
The 3D view can be used to compare the 2D mesh to the underlying ground model.
01:01
Because elements have a single level applied, breaklines can be used to help create a more representative mesh
01:09
by forcing how the elements are created.
01:12
Open a new scenario and add some General line objects to help pick out the topography more accurately.
01:19
This will then allow a comparison of the mesh changes to be made.
01:24
In this example, there is a channel in the ground model.
01:28
Add a pair of general lines at the top and bottom to help with the mesh creation.
01:34
When creating only a few lines, you can assign the category manually.
01:40
However, if you are importing numerous breaklines,
01:43
you can either set the category during the import process or update the category in the line grid window.
01:51
Here, the lines are assigned a common category of Breakline.
01:56
With all breaklines added as general line objects and assigned the same category,
02:03
re-mesh the 2D zone.
02:05
In the Mesh 2D Zones dialog, Break Lines section, expand the Polylines drop-down and select Breakline.
02:15
Click OK to mesh the 2D zone.
02:19
Once complete and loaded, you can see that the breakline is used to determine the boundary of the adjacent mesh elements,
02:27
and that the mesh lines up with the breaklines.
02:30
Open the 3D view window again for a better understanding of the impact this has on the 2D element levels.
02:38
The bottom and top of the channel are now more accurately represented, which will lead to more accurate results.
Video transcript
00:03
It is often necessary to edit a mesh using various objects to provide more detail
00:09
and improve the representation of the underlying topography.
00:13
These mesh editing objects can be manually added or taken from external files,
00:19
layers displayed in the GeoPlan view, or objects within the network.
00:25
Breaklines are used to force triangle edges along a given line.
00:31
These can be used to enhance the detail of the mesh,
00:34
or to ensure that the ground model topography is represented more accurately by the mesh.
00:41
For example, they can help to pick out the tops of embankments or the bottom of channels.
00:48
In this example, a mesh has already been generated using the default parameters.
00:54
The 3D view can be used to compare the 2D mesh to the underlying ground model.
01:01
Because elements have a single level applied, breaklines can be used to help create a more representative mesh
01:09
by forcing how the elements are created.
01:12
Open a new scenario and add some General line objects to help pick out the topography more accurately.
01:19
This will then allow a comparison of the mesh changes to be made.
01:24
In this example, there is a channel in the ground model.
01:28
Add a pair of general lines at the top and bottom to help with the mesh creation.
01:34
When creating only a few lines, you can assign the category manually.
01:40
However, if you are importing numerous breaklines,
01:43
you can either set the category during the import process or update the category in the line grid window.
01:51
Here, the lines are assigned a common category of Breakline.
01:56
With all breaklines added as general line objects and assigned the same category,
02:03
re-mesh the 2D zone.
02:05
In the Mesh 2D Zones dialog, Break Lines section, expand the Polylines drop-down and select Breakline.
02:15
Click OK to mesh the 2D zone.
02:19
Once complete and loaded, you can see that the breakline is used to determine the boundary of the adjacent mesh elements,
02:27
and that the mesh lines up with the breaklines.
02:30
Open the 3D view window again for a better understanding of the impact this has on the 2D element levels.
02:38
The bottom and top of the channel are now more accurately represented, which will lead to more accurate results.
Breaklines are used to force triangle edges along a given line. These can be used to enhance the detail of the mesh, or to ensure that the ground model topography is represented more accurately by the mesh.
Breaklines can help pick out the tops of embankments or the bottom of channels. In this example, a mesh has already been generated using the default parameters.
Open a 3D view to compare the 2D mesh to the underlying ground model:
Because elements have a single level applied, breaklines can be used here to help create a more representative mesh by forcing how the elements are created.
Start by creating a new scenario:
Now, add some General line objects to help pick out the topography more accurately. For this example, add a pair of general lines at the top and bottom of the channel to help with the mesh creation:
When creating only a few lines, the category can be assigned manually. However, if importing numerous breaklines, either set the category during the import process or update the category in the line grid window.
With all breaklines added as general line objects and assigned the same category, re-mesh the 2D zone:
The breakline is used to determine the boundary of the adjacent mesh elements, and the mesh lines up with the breaklines.
For a better understanding of the impact the breaklines have on 2D element levels, view the results in 3D:
The bottom and top of the channel are now more accurately represented, which leads to more accurate results.
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