Modify items

Added May 4, 2021 by Tekla User Assistance tekla.documentation@trimble.com

Software version: 
2021

Modify items

Modify items

You can fine-tune the geometry of the model by modifying items. This is how you can create sloping slabs, for example.

Tip:

You can create item shapes using existing geometry and parts in the model.

When you modify an item's geometry, you can move item vertexes (corner points), edges, and faces. However, the faces always need to stay planar, so you cannot move all vertexes or edges freely. You may first need to add new edges to split existing faces. These edges act as hinges or turning joints between the faces.

When you have modified an item's geometry and want to save the changes, you can choose to update the item's current shape, or to create a new shape. Tekla Structures also stores temporary shapes in the shape catalog in case you need to undo actions. The unused temporary shapes will be deleted from the shape catalogcatalog that displays information of item shapes

The shapes are downloaded from Tekla Warehouse, are created using existing geometry and parts in the model, or are modeled using software other than Tekla Structures, for example SketchUp.

when you save the model.

Start geometry editing

Before you start, create items.

  1. Ensure that Direct modification is switched on.
  2. Select the item whose geometry you want to modify.

    You can only modify items that have a solid shape.

    The Geometry editing tab appears at the right end of the ribbon:

    Tekla Structures shows the direct modificationfunction that activates the mode where the model objects can be modified by using handles

    Direct modification enables additional handles and modification options.

    axis and rotation handles for the selected item. For example:

  3. Modify the position settings in the item properties so that both On plane and At depth are set to Middle with offset 0.

    This ensures that the later geometry modifications are accurate.

  4. If you need to adjust the item location in the model, drag the direct modification axis handles or location dimension arrowheads.

Modify the geometry of an item

Before you start, ensure that you have the Geometry editing tab open and the correct item selected.

  1. Click Handles to display handles for the selected item. For example:

  2. Move the mouse pointer over the selected item to highlight its faces, edges, and vertexes.
  3. To check the coordinates of a vertex, select the vertex.

    Tekla Structures shows the absolute, work planeplane that the user has chosen in a model and that is currently active for working on in a model view

    Newly created, copied, or moved model objects comply with the work plane. For example, shifting the work plane to follow a sloped plane makes it easier to model sloped structures.

    based coordinates in the 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.

    . For example:

  4. To move a face, edge, or vertex, drag it to a new location.

    Alternatively, you can use numeric snapping and the Enter a Numeric Location dialog box.

    To move a selected vertex to an exact location, you must enter all three coordinates (x, y, and z) of the new location, for example 400,200,0.

    Note that you can use a special character in front of the coordinates to temporarily override the default (relative) snapping mode, for example ! for global coordinates. With relative and absolute coordinates, you can also use coordinate axis prefixes x, y, and z to move a vertex or dragged edge in the prefixed directions only, for example @z500 or $y6000,z-500.

  5. To delete an edge or vertex, select it and press Delete.

    You can only delete edges whose both adjacent faces are in the same plane, and vertexes whose all adjacent faces are in the same plane.

    If the adjacent faces of an edge or vertex are not in the same plane, you can drag the edge or vertex on top of another one to combine them.

  6. If you need to undo actions, press Ctrl+Z.

Add an edge to an item

You can add edges to the selected item, and so split existing faces. Create the new edges so that they do not cross over any existing edges.

Before you start, ensure that you have the Geometry editing tab open and the correct item selected.

  1. On the Geometry editing tab, click Edge.
  2. Pick the start point of the edge.

    The start point must be located on an existing edge or vertex.

  3. Pick the end point of the edge.

    The end point must be located on a vertex or on the same face as the start point, but on another edge. If you try to pick an invalid point, Tekla Structures shows a preview of the edge in red.

    Tekla Structures creates the edge between the points you picked. For example:

    (1) Start point

    (2) End point

  4. If you want to add more edges, repeat steps 2 and 3.
  5. To stop adding edges, press Esc.

Add a vertex to an item

You can add vertexes and related edges to the faces of the selected item. You can use the vertexes as drainage points when you create sloping slabs and plan drainage, for example.

Note that you cannot add vertexes to faces that have openings or recesses if these openings are part of the item shape. However, if only the item in the model has been cut, and not its shape, you can add vertexes to these faces.

Before you start, ensure that you have the Geometry editing tab open and the correct item selected.

  1. On the Geometry editing tab, click Point.
  2. Move the mouse pointer over the faces of the selected item.

    In convex-polygonal areas, where all internal angles at face corners are less than 180 degrees, Tekla Structures shows a preview of the edges that start from each face corner and join at the current location of the mouse pointer. For example:

    If the item faces have concave-polygonal areas, where at least one internal angle is larger than 180 degrees, Tekla Structures automatically shows and adds edges that separate the concave-polygonal areas from the convex-polygonal areas.

  3. Pick a point on the desired face.

    Tekla Structures creates the vertex and related edges that join the new vertex to all existing vertexes of the same face. For example:

  4. If you want to add more vertexes, pick more points.
  5. To stop adding vertexes, press Esc.

Save a modified item and shape

When you save modified items in the model, you can choose to update the selected item's current shape, or to create a new shape for later use.

Before you start, ensure that you have the Geometry editing tab open and the correct item selected.

  1. On the Geometry editing tab, click Save as.

    The Save as dialog box opens.

  2. Select one of the following options:
    • Update current shape to use this geometry

      to update the current shape, the modified item, and all the items using that shape in the model.

      If all items are not updated in the model, save and re-open the model.

    • Create a new shape in the shape catalog with the name

      to create a new shape in the shape cataloguser interface for displaying or modifying information in categorized lists

      For example, profile catalog and shape catalog are catalogs.

      , and to update the modified item in the model to use the new shape.

  3. If you chose to create a new shape, enter a name for the shape.
  4. Click Save.

    Tekla Structures updates the items in the model and saves the shape in the shape catalog.

The temporary shapes that were created during the editing process will be deleted from the shape catalog when you save the model if the shapes are not used by any item.

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