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Point Cloud details

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Message 1 of 3
martin.harlem
354 Views, 2 Replies

Point Cloud details

 

Two small questions related to Civil 3D:

 

1) When importing creating point clouds from x,y,z-data, most of the time, the point cloud consists of a number of point clusters seperated by void space. However, when creating a surface from this point cloud, chosing point cloud extents as a constraint, Civil 3D creates lines/triangles between these point clusters. This is illustrated in the file in the link:

 

http://ge.tt/2Rcfq5b

 

A way to get this away is to edit the surface by using the Delete line command, however, this can be very cumbersome.

Is it possible to specify in Civil 3D that, inside the point cloud, point clusters should be added to surface, but no lines should be added between the point clusters (one could e.g. think about a point interdistance factor, which the user could specify. This would then for each point consider the distance to neighboring points and if the distance between that particular point and a neighboring point exceeds a that certain factor, then NO line is added.

 

2) Typical, surfaces are created from point clouds with different "densities" (one surface is based on points taken on a 5x5m grid ; another surface is based on points taken on 1x1m grid, osv...), depending on the level of detail of the seabed survey. When combining these surfaces into one surface, is there a way to specify that, in case of overlap, the surface with the highest density in points should be chosen, in the understanding that Civil 3D replaces the less detailed surface with the more detailed surface at these places where there is overlap?

 

Thanks in advance,

2 REPLIES 2
Message 2 of 3

In your surface's Properties, Definition Tab, set "Use maximum triangle length" to "Yes" and then set the maximum distance that you want to use. With this is set the surface won't triangle the gaps in the data.

 

We don't have anything that would deal with the second request. To me it sounds like an engineering decision that should be made by you.

 

Peter Funk

Autodesk, Inc.



Peter Funk
Autodesk, Inc.

Message 3 of 3

As to #2, paste order would be important; paste the higher density surface over the lower density surface.

Eric Collins, P.Tech.(Eng.)

Win 10
Intel i7 9700 @ 3 GHz
16 GB RAM
Civil 3D 2019

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