Create Section

Use the Create Section option to create a cross-sectional 3D view with a specified dip and width of view.

Tip:   Select the Show Overview button from the Graphics toolbar to open an overview window showing the Plan location of the section.

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Instructions

On the View menu, click Create Section.

Follow these steps:

1. Choose a Section Type.

   • Create or replace the window's primary section - Select this option to create a Primary Section. This option is equivalent to the View > Change View > Section option with some additional items for displaying this section, such as being able to select the shadow colour, and options for the Clipping Planes. The Primary Section will disappear when you select the Reset button.

     If you create a new primary section in the same viewport, then the previous section is replaced. Your view is changed to be perpendicular to the plane when you create a primary section. This is why you might like to use the Show Overview button.

     Note:   Only primary sections can have shadows. The Annotate check box and Section name text box will be unavailable if this option is selected.

   • Create a section through all objects - Select this option to create a non-primary section. The number of non-primary sections that you can create is limited by the clipping that you require (and possibly by your graphics card's OpenGL implementation - for more information see the OpenGL website ). Unlike primary sections, your view is not changed to be perpendicular to the plane when you create a non-primary section.

     Non-primary sections can be used for intersecting with volumes (or triangulations) to create intersection highlights. For more information see Highlight Intersections .

   • Create a section through a single object - Select this option to create a non-primary section. When you create a section through all objects the clipping plane affects everything. However, when you the other objects are not clipped nor are their intersections with planes calculated.

     Tip

     Sometimes viewing a triangulation in section view can be difficult if you happen to be viewing the triangulation edge on. To make it easier to see, use the Slice toolbar icon Line Width to adjust the thickness of the intersection line.

     

2. Select Draw Shadows to shadow the data that falls outside the section. Shadows are only displayed if you choose to clip By width.

   • Backwards width/Forwards width - Specify the width of data that will be shadowed out either side of the section. The backwards width and the forwards width do not have to be the same value.

   • Backwards colour/Forwards colour - Specify the colour of the backwards and forwards shadows.

3. Use the Clip drop-down list to specify the type of clipping plane to be used with the section. There are four options:

   • By width - The view of your section will only include the width of the section (plus any shadows if you have created a primary section).

   • Forwards - The view of your section will include everything in front of your section.

   • Backwards - The view of your section will include everything behind your section.

   • No clipping - The view of the section will include everything.

4. Enter the Step size. This is the distance that is moved each step when moving the section through space.

   Note:  To move the section through space, use the Slice Forward or Slice Backwards icons on the Slice toolbar. Alternatively, you can also select the Align View With Current Slicing Plane icon and use the up and down arrows to move through space.

5. Choose whether you want Symmetrical or Asymmetrical clipping. When you choose to create a section By width, you can specify that the section is symmetrical, that is, same distance forwards or backwards, or asymmetrical, that is, different distance forward and backwards.

6. In the textbox labelled Display grid spacing, enter the spacing of the grid used to represent the plane. To control the display of the grid, whether it is visible or invisible, use the Display slider bar on the Slice toolbar.

   Click the Display colour icon to specify the colour of the grid used to represent the plane.

7. Select Annotate check box and enter a Section name to annotate a point on the section plane. This name will be displayed in the drop-down list on the Slice toolbar. The annotation value will change as you move the section through space. The size of the annotation is directly proportional to the Display Grid Spacing setting.

8. Select the viewing plane option.

   Line segment

   Select this option to define the plane by selecting an existing line and specifying the dip. Only design strings may be picked and it is not possible to pick a line in an underlay. The direction of the view, and therefore the direction of the stepping, depends on the digitised sequence of the line. The digitised sequence of the line can be reversed using the Design > Object Edit > Reverse option.

   2 Points

   Select this option to define the plane by digitising two points and specifying the dip. To locate a point precisely, use the Snap to Objects or Snap to Points modes on the Digitise toolbar. Points may be snapped onto underlays, such as block model slices or triangulations. If you use Indicate mode to select the points, then the points have the current default Z value.

   Dip

   If you choose to select your plane by either a line segment or 2 points, then you must indicate a dip. The dip is the angle of the section from horizontal. Valid dip angles are between -90 and 90.

   3 Points

   Select this option to define the plane by digitising 3 points. To locate a point precisely, use the Snap to Objects or Snap to Points modes on the Digitise toolbar. Points may be snapped onto underlays, such as block model slices or triangulations.

   Selecting this option to define explicitly the location and orientation of a plane by indicating 3 points. The first two points define the bearing of the plane, and the third point defines the dip of the plane.

   Guide centre line [section is normal to line]

   Select this option to define the plane by selecting a centre line. W tag of the points of the picked centre line can be employed to pass section width.

   To achieve the best results for the following three methods, Easting, Northing and Level, use the Zoom Data Extents icon on the Graphics toolbar, which allows all of the graphics to be viewed.

   Easting

   Select this option to enter a specific Easting value (X value). There are two ways to enter the Easting value; you can enter it directly into the text box, or you can select the Digitise icon, which to select a point from the viewing window. The resulting section will be facing an easterly direction.

   Northing

   Select this option to enter a specific Northing value (Y value). There are two ways to enter the Northing value; you can enter it directly into the text box, or you can select the Digitise icon, which to select a point from the viewing window. The resulting section has a constant Northing (Y) value.

   Level

   Select this option to enter a specific Level value (Z value). There are two ways to enter the Level value; you can enter it directly into the text box, or you can select the Digitise icon, which enables you to select a point from the viewing window. The resulting section has a constant Level (Z) value.

   To locate a point precisely, use the Snap to Objects or Snap to Points modes on the Digitise toolbar. Points may be snapped onto underlays, such as block model slices or triangulations. You will need to select this point before completing the panel. The panel will collapse while you select the point.

   Facing

   Select the orientation of the section view. The drop-down list contains different options depending upon what method was used to select the plane (see table below). The first choice in the drop-down list is the default orientation.

   Method	Orientation
   Line Segment	Point Order Reverse Point Order
   Two Points	Left to right Right to left
   Three Points	Clockwise Anticlockwise
   Guide centre line	Point Order Reverse Point Order
   Easting	East West
   Northing	North South
   Level	Down Up

9. Click OK.