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Point clouds

Last updated April 18, 2019 by Tekla User Assistance tekla.documentation@trimble.com

Software version: 
2019

Point clouds

Point clouds

Point clouds are groups of measured points on the surfaces of objects created with 3D laser scanners, for example, Trimble 3D laser scanners. In construction, the point clouds are mainly used in renovation projects to define the building or structure that is to be renovated. They can also be used to get the exact position of existing machinery, pipework or landscape that need to be taken into consideration on the site. You can also use them to check execution by importing them as build points into a model to be compared to the design.

When you attach a point cloudgroup of measured points that are imported to Tekla Structures as one unit

Point clouds can be placed by the model origin or by a defined base point.

to a Tekla Structures model, you can place it either by the model originglobal coordinate system point of origin used for the model

Model origin is the default project base point.

or a defined base pointpoint in a model that is used to define a starting point in surveying and that is used as an anchor point in coordinate and height transformations

A Tekla Structures project can have several base points but only one of them can be the project base point.

Base points allow the use of another coordinate system needed for interoperability and collaboration. Base points can also be used in drawings, and in reports and templates. Model origin is the default base point in Tekla Structures.

Base points are also called control points.

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The original point cloud file is processed and cache files are created in the Potree format. The point cloud conversion occurs as a background process, and you can continue working with Tekla Structures meanwhile. Point cloud data is stored in the folder defined by the advanced option XS_POINT_CLOUD_CACHE_FOLDER. By default, the folder is %LocalAppData%\Trimble\TeklaStructures\PointClouds , for example, C:\Users\<user>\AppData\Local\Trimble\Tekla Structures\PointClouds. It may be useful to use a network drive for the potree file in a project. The file will not be copied to the local computer. This advanced option is user-specific, and it is located in the File Locations category in the Advanced Options dialog box.

If the same point cloud is used in several models, it will not be converted again or duplicated when you attach it. If point clouds are identical, the existing converted file is used, otherwise the file is converted.

In Tekla Structures , point clouds have colors if the original file format supports colors.

Point clouds can be seen in both the OpenGL model viewview that is represented in the modeling mode

Model view is available also in the drawing mode and it is represented in its own window.

and in the DX model view. The DX model view with perspectiveview projection that displays objects in a model view from a particular standpoint so that distant objects appear smaller than close ones, as do text and points

The user can zoom, rotate, pan, or fly through the model objects.

projection may give better visual result. Performance with bigger amount of data and/or larger number of views may make DX usage impossible.

Compatible file formats

ASCII ( .asc , .xyz )

E57 ( .e57 )

LAS ( .las )

LAZ ( .laz )

PTS ( .pts )

PTX ( .ptx )

Potree ( .js )

Trimble scan format ( .tzf )

Limitations

  • Some basic Tekla Structures model handling functionalities are not available, such as select, undo, move, rotate, copy, and pop-up menu on right-click.
  • Point clouds are not autosaved.
  • You cannot delete a point cloud from the point clouds list using the keyboard button Delete.
  • Point clouds are not visible in drawings.
  • Point clouds are not shared in Tekla Model Sharingcloud service for collaboration and for storing and sharing a model

    Tekla Model Sharing is one of the Tekla online services.

    or in multi-user modemode in which several users can work on the same model using their own working models

    .
  • For the file formats ASCII, PTS: On each text line, the first three fields must be: x y z. For colored point data, the last three fields must be: r g b

Attach a point cloud to the model

  1. Click the Point clouds button in the side pane.

  2. If you want to place the point cloud inside the work areacertain portion of the model that is currently active for working on in a view

    Tekla Structures indicates the work area using dashed lines. Since objects outside the work area exist but are not visible the user can set a certain sized work area so that the views of the model are simpler and quickly updated, for example.

    , select the Show inside work area only check box.
  3. Click Attach.
  4. Browse for the point cloud file.
  5. Change the point cloud scale, if needed.
  6. In Location by , select Model origin to place the point cloud in the model origin, or select a base point to place the point cloud in the real world coordinates.
    Note: If you do not know the coordinate system of the point cloud, select Auto-created base point to get the point cloud near the model origin. Automatic base point with point cloud bounding boxrectangular border with the smallest measure within which all the selected points that position the model objects lie

    In Tekla Structures two-dimensional bounding boxes are used in drawings and three-dimensional bounding boxes in models.

    min x, min y, and min z coordinates will be created in Tekla Structures origin.
  7. Click Attach point cloud.
  8. To show the point cloud in the model, select the model view where you want to show it, and click the eye buttonnext to the point cloud in the list.

    Note that when you select a model view, it has a yellow frame.

    When the point cloud is set visible in the model view, you can see the min x, min y, and min z coordinates of the point cloud bounding box on the status bar.

    To hide the point cloud, click.

When you are modeling, you can snap to points for modeling and measuring distances. You can use clip planes in point clouds to exactly show what you want, for example, clip off the roof and some of the floors so that you can see the bottom floor of the building, and everything there that needs your attention in the planning phase. You can also use the Clipper tool in Tekla Warehouseservice for collaboration and for storing and sharing Tekla Structures content

In Tekla Warehouse the content items are stored in collections. Tekla Warehouse includes the Tekla Warehouse Service and the Tekla Warehouse web site.

Tekla Warehouse is one of the Tekla online services.

for handling several clip planes at a time, and split the model to smaller pieces for visualization and modeling.

Detach a point cloud from a model

  • To detach a point cloud, clickDetach next to the point cloud name in the Point clouds list. Then reopen the model or save the model.

    Note that you cannot detach the point cloud by pressing Delete on the keyboard.

    The point clouds are cached to the default location or to the location specified by the user. When a point cloud is no longer used in any Tekla Structures model, it is cleaned from cache.

Set the default maximum point count in a view

You can use the advanced option XS_SET_MAX_POINT_CLOUD_POINT_COUNT to set the default maximum value for the points in a view. The default value is 10 000 000 (10 million).

This advanced option is system specific, and it is located in the Model View category of the Advanced Options dialog box. Restart Tekla Structures if you change the value.

Clip point clouds and reference models only

Set the user-specific advanced option XS_DO_NOT_CLIP_NATIVE_OBJECTS_WITH_CLIP_PLANE to TRUE to only clip point clouds and reference models with the Clip plane command. Native Tekla Structures objects are not clipped. FALSE is the default value. This advanced option is located in the Model View category in the Advanced Options dialog box.

Redraw the model views after changing the value.

Point cloud example

In the first image below, a point cloud has been attached to a model in a plan view. Remember to select a model view and click the eye button, otherwise the point cloud will not be shown.

In the next image, the clip planetool that hides a portion of the model in a model view

Clip plane can be created in model views that show model object faces. The clip plane is aligned with the selected model object face.

tool has been used to cut off floors and other structures:

In the next image, a section has been cut to be used in a section viewdrawing view that shows a selected area as a cross section

A section view can be created of the parts in a drawing view. A section view can be created manually or automatically.

:

The last image shows the section view:

Share point clouds with other users

Point clouds are normally so large in file size that it is not sensible to share the point cloud as a part of the model data. Point cloud is not structural domain data but project data that is not a part of the model, and therefore it is not dependent on the model save. However, there is need for multiple persons to use the same point cloud model efficiently. You can use the potree file for sharing the point cloud. The best practices in sharing the point cloud potree file among model users are explained below. You first need to create the potree file and copy the potree file to a shared location, and then other users can attach it to their Tekla Structures model.

Create a potree file

Option 1: With Tekla Structures

  1. Create a potree file by attaching a point cloud model to a Tekla Structures model.

    The potree file is created to the folder defined by the advanced option XS_POINT_CLOUD_CACHE_FOLDER. The potree file is named as <potree_name>.db , and it has a folder with the same name. For example:

  2. Copy both the <potree_name>.db file and the related folder to a shared location. You can rename the model if you want, in which case you also need to rename the folder.

    Note:

    Do not replace existing potree data, especially if it is used by other users.

Option 2: With Point cloud manager

You can download Point cloud manager from Tekla Warehouse.

For detailed instructions about using Point cloud manager , see the Point cloud manager help. You can open the help by clicking the help button.

To use the Point cloud manager :

  1. Install the applicationpart of Tekla Structures functionality that is developed in order to extend the capability of Tekla Structures but that is not included in the Tekla Structures installation

    , and start it from the start menu or start screen, depending on your Windows version.

  2. Set the root folder for the project, for example C:\Trimble\PTRS.

  3. Click the Add new project button to create a project with a given name.

    This name will be the name of the potree database and potree folder.

  4. Import one or more point cloud models by clickingAdd file , and browsing for the point cloud file.

  5. When the point cloud has been imported, create the potree by clicking.

  6. Copy the <potree_name>.db and the <potree_name> folder to a shared location. Attaching a potree requires both the <potree_name>.db and the <potree_name> folder.

Note:

Do not replace existing potree data, especially if it is used by other users.

Attach a potree from a shared location

  1. Open Tekla Structures and the Point clouds pane from the side pane.

  2. Browse to the point cloud folder ( mypotree in the example above) and select the point cloud .js file. Then follow the instructions above for attaching the point cloud.

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