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CHAPTER 3

3 User Grid Systems

The User Grid Systems utility creates 3D rectangular and radial grids in Model. Grids may be project wide or local to a specific Plant area or a room in a module or building.

Selecting 3D VIEW > Aids > User Grid Systems displays the User Grid Systems form.

The form is re-sizable and contains a pane to display available grid systems and a number of options for formatting the displayed grid. The form menus enable grids to be created and modified and the co-ordinates of a picked point to be displayed in both World and Grid co-ordinate systems.

Grids are stored in a design database and have their own hierarchy structure as shown:

Although user grid systems are stored in a design database they do not appear in the drawlist.

3.1 Creating 3D Rectangular Grids

Selecting Create > 3D Rectangular Grid… from the User Grids Systems form menu displays the Reference 3D Rectangular Grid form.

The form has two tabs. The Options tab where the grid axis offsets, line IDs and labels are specified; and the Position & Orientation tab, where the location and orientation of the grid are specified.

On the Options tab the Display area of the form contains radio button options that control how the grid is labelled in the 3D View.

The X Axis, Y Axis and Z Axis areas of the form enable grid labels, line IDs and offsets to be specified for each axis individually.

A label for the respective axis may be entered in the appropriate Label text box. The label should be meaningful and will suffix the Grid Axis (GRIDAX) and Gridline (GRIDLN) element names in the Model Explorer. The labels X, Y and EL (elevation) are commonly used for the X, Y and Z axes respectively.

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The line IDs are used to identify individual gridlines and suffix the label in the Model Explorer. The ID format may be alphabetic or numeric and may be incremented by any step.

The Offsets are relative values from the previous gridline. Negative or positive values may be entered which will determine how the grid is distributed around the grid origin.

Clicking the Autofill… link label on the Reference 3D Rectangular Grid form displays the Autofill Rectangular Grid System form.

This form enables the labels, range and interval of offsets and the ID formats to be specified. When first opened the form is populated with default values which can be adjusted accordingly.

Having specified the required data clicking the OK button will dismiss the form and autofill the Reference 3D Rectangular Grid form.

The auto filled Reference 3D Rectangular Grid form may be edited manually to make the final adjustments to the grid.

It is often easier to use the autofill function and edit than enter all the data from scratch.

The Preview link label will display the grid in the current 3D View so that it may be visually inspected before creation.

The Set View Limits to Grid link label zooms the view such that the specified grid fills the 3D View.

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The Position & Orientation tab enables the grid origin to be positioned and the grid to be orientated.

The Position area of the form enables the grid origin to be placed explicitly by entering East/West, North/South and Up/Down, i.e. X, Y and Z, co-ordinates in the relevant text boxes.

The direction may be changed by using the three pull-downs. Checking one of the Lock checkboxes disables the editing of that co-ordinate.

The position may also be specified by using the Positioning Control form and graphically selecting a position in the 3D View.

The With Respect To (WRT) textbox allows the selection of co-ordinates with respect to any model element. The default is World.

See TM-1801 AVEVA Everything3D™ Foundations training guide for information on the Positioning Control Form.

The Orientation area of the form enables the grid to be orientated in three ways:

1. Clicking the Through three point’s button prompts for the graphical selection of three points to define the plane of the grid. When the orientation points have been picked, the Y is and Z is text boxes are updated with new directions defined by the grid plane.

2. Clicking the Through origin and two points button prompts for the graphical selection of two points which, together with the origin point, define the plane of the grid. When the orientation points have been picked, the Y is and Z is text boxes are updated with new directions defined by the grid plane.

3. The orientation can also be set by entering a direction in the Y is and Z is text boxes. The X direction is automatically derived, and is displayed beneath the two text boxes. Only one direction may be altered at a time so it may require two or more entries to re-orientate the grid to the required orientation.

A grid name may be entered in the Name text box at the bottom of the Reference 3D Rectangular Grid form. This name will be displayed on the User Grid Systems form so that it may be selected for future use or modification.

Clicking the Apply button creates the grid elements and displays the grid in the 3D View. If no Grid World elements are in a writeable database, one is created automatically. If more than one writeable Grid World exists, the new grid will be placed in the first available one in the hierarchy.

The Cancel button closes the Reference 3D Rectangular Grid form.

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3.2 Creating 3D Radial Grids

Selecting Create > 3D Radial Grid… from the User Grids Systems form menu displays the Reference 3D Radial Grid form.

The form has two tabs. The Options tab, where angles, radii, offsets, line IDs and labels are specified; and the Position & Orientation tab, where the location and orientation of the grid are specified.

On the Options tab the Display frame contains radio button options that control how the grid is labelled in the 3D View.

The Angles, Radii and Z Axis frames enable grid labels, line IDs, radial line angles, concentric circular line radii and Z axis offsets to be specified.

A label for the angles, radii and Z axis may be entered in the appropriate Label text box. The label should be meaningful and will suffix the Grid Axis (GRIDAX) and Gridline (GRIDLN) element names in the Model Explorer.

The labels A, R and EL (elevation) are commonly used for the angles, radii and Z axis respectively.

The line IDs are used to identify individual gridlines and suffix the label in the Model Explorer. The ID format may be alphabetic or numeric and may be incremented by any step.

The Angles are in degrees, counter clockwise from East (X). The Radii are absolute values from the grid origin and the Offsets are relative values from the previous gridline.

Clicking the Autofill… link label on the Reference 3D Radial Grid form displays the Autofill Radial Grid System form.

This form enables the labels, range and interval of offsets and the ID formats to be specified. When first opened the form is populated with default values which can be adjusted accordingly.

Having specified the required data clicking the OK button will dismiss the form and autofill the Reference 3D Radial Grid form as shown below.

The auto filled Reference 3D Radial Grid form may be edited manually to make the final adjustments to the grid.

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It is often easier to use the autofill function and edit than enter all the data from scratch.

The Preview link label will display the grid in the current 3D View to so that it may be visually inspected before creation.

The Set View Limits to Grid link label zooms the view such that the specified grid fills the 3D View.

The Position & Orientation tab enables the grid origin to be positioned and the grid to be orientated.

This tab functions as previously described for Rectangular Grids.

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3.3 Grid Display Options

When one or more grid systems have been created the Displaying grid system area of the User Grid Systems form is activated.

Selecting a grid system from the Grid System pane and clicking the Display button displays the selected grid in the 3D View and activates the Set View Limits to Grid button which may be used to set the display limits to the whole grid.

The Hide button removes the selected grid system from the view and re-activates the Display button.The radio buttons in the Display area of the form control the labelling of the grid.

Axes only displays the gridlines only with a label at the grid origin.

Gridline IDs displays the gridline IDs prefixed with the specified label.

Spacings displays the spacing between grid lines for rectangular grids and the spacings between concentric circles and the angles between radial lines for radial grids.

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Coordinates displays the co-ordinates of the grid lines, prefixed by the specified label, for a rectangular grid and the distance from the origin of the concentric circles and the cumulative angle of the radial lines for a radial grid.

These display settings are also available in the Display area of the Reference 3D Rectangular Grid and Reference 3D Radial Grid forms.

Clicking the Select display axes… button displays the Plant Grid Axes form, if the currently selected grid is rectangular, or the Radial Grid Axes form if the currently selected grid is radial.

The Plant Grid Axes form enables the display plane for each axis to be toggled On or Off and the location of the plane to be selected, i.e. on a gridline.

The display of an axis plane is toggled using the checkbox adjacent to the appropriate plane. The plane is located using the pull-down for the appropriate plane. The list contains all of the gridlines for that axis.

For example, displaying all three axes for the grid, i.e. checking all three checkboxes and selecting X3 for the X Axis plane and

YE for the Y Axis plane gives the following result.

When the Plant Grid Axes or Radial Grid Axes forms are opened, the grid is removed from the 3D display and the Display button activated. Clicking the display button after the OK (or Cancel) buttons have been clicked on the Grid Axes forms, re-displays the grid with any changes.

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The Radial Grid Axes form enables the elevation, i.e. the Z Axis location, to be specified at which the grid is displayed. The pull-down shows all of the Z Axis locations specified when the form was created or modified.

Selecting a location displays the whole grid at the selected elevation.

The 0 label indicates the grid origin.

3.4 Modifying User Grid Systems

Highlighting the grid to be modified in the Grid Systems area of the User Grid Systems form and selecting Modify > Selected Grid System… from the form menu displays the Modify Grid (nnnn), where nnnn is the name of the selected grid.

The displayed form depends on the type of grid selected. Both forms are identical to the forms used for creating the two grid types except that they are populated with the current settings of the selected grid and the Name text box is greyed out.

Having made the required changes to the grid, clicking the Save button on the Modify Grid form displays a confirmation message to replace the existing grid.

3.4.1 Deleting User Grid Systems

Highlighting the grid to be modified in the Grid Systems area of the User Grid Systems form and selecting Delete > Selected Grid System… from the form menu deletes the grid from the form and from the 3D View if displayed.

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Having selected Delete > Selected Grid System… a confirmation message to delete the selected grid is shown. Clicking Yes will delete the grid. Clicking No will cancel the process and maintain the grid.

3.5 Displaying Picked Positions in Grid Coordinates

A position may be picked from a 3D View and displayed in terms of Grid co-ordinates.

Selecting Display > Picked position in grid cords… from the User Grid Systems form menu prompts for a position to be picked and activates the Positioning Control form.

Having picked the position the Display Grid Coords form is displayed, showing the position in both World and grid co-ordinates.

The grid used for the co-ordinates is the current grid selected from the User Grid Systems form. The grid name is displayed on the Display Grid Coords form.

The referenced grid does not have to be displayed to obtain the position in grid co-ordinates.

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Exercise 4 User Grid Systems

Empty the Drawlist and make the World the CE. Select 3D VIEW > Aids > User Grid Systems to display the User Grid Systems form. Select Create > 3D Rectangular Grid… from the form menu to display the Reference 3D Rectangular Grid form. Click the Autofill… link label to display the Autofill Rectangular Grid System form. Click the OK button on the form, accepting the default Autofill values. Note that the Reference 3D Rectangular Grid has now been populated with values.

Click the Preview link label and the Set View Limits to Grid link label to display the grid in the 3D View. Enter Rectangular_Grid in the Name textbox and click the Save button. Using the Model Explorer navigate to GRIDWL TRAINING-GRIDS. Note that a GRIDSY element named Rectangular_Grid has been created. Click the Close button on the Reference 3D Rectangular Grid form.

On the User Grid Systems form click the Gridline IDs radio button and then click the Display button to display the grid with the selected annotation option. Note that the Gridline IDs are now displayed on the grid. Try the other Display options.

Click the Select display axes… button to display the Plant Grid Axes form. Check the Display plane through X axis offset at and the Display plane through Y axis offset checkboxes. Leave the option lists at their default values of X0, YA and EL0 and click the OK button. Note that the grid has been removed from the 3D View. Click the Gridline IDs radio button on the User Grid Systems form and then click the Display button. Note the changes to the displayed grid.

Display the Plant Grid Axes form again and try different combinations of the different planes from the option gadgets and note the different combination of grid planes.

Create a 3D Radial Grid named Radial_Grid using the Autofill option on the Reference 3D Radial Grid form. Enter A in the Label textbox for the Angles on the Autofill Radial Grid System form. Display the radial grid and try the different labelling and axis options.

Create a 3D Rectangular Grid named Area01_Grid with the following data: