Add Calculations - Grid: 3 Point Input

The 3-point input system can be used when a grid of calculation points is not parallel to the XY axis or when a sloping calculation grid is desired. 3 point grids can only be specified in Plan view.

Positioning Technique:

1st Point - Sets the lower left hand corner of the grid of points.
2nd point - Defines the grid's baseline and always has the same elevation coordinate as the first point.
3rd Point - Defines the height of the grid (number of points from top to bottom) and its slope. A Z-coordinate other than zero will slope the plane (tilt it up from baseline).

From the Add menu choose Calculations -Grid-3 Pt. Input, or from the Calculations Toolkit select $image\calc_button-add_grid.jpg$ (Left click on the pull-down arrow to the right of the button to invoke the secondary menu. Select 3 Pt. Input).
Specify a unique label up to 32 characters. The default label will be CalcPts_1. Unless changed, subsequent labels will be CalcPts_2, CalcPts_3, etc. If a number is used for the label, subsequent labels will be incremented accordingly.
An optional description may be entered up to 80 characters. Meaningful descriptions that include size and color information will be useful when generating schedules.
Specify the point spacing from left to right and top to bottom. By default, a point spacing of 10 by 10 is used. As the point spacing changes, the text size adjusts, automatically.
You may center the measurement points within the grid boundary, if desired, by clicking in the selection box adjacent to Center Points Relative to Grid Boundaries.
Select the light meter type by clicking on the appropriate radio button (and entering the desired values, if necessary). By default, the horizontal meter and grid is selected.
Specify the Summary options to calculate. By default, average, maximum and minimum illuminance are displayed along with uniformity ratios (Max/Avg ratio is not selected by default). If Number of Points is selected, the number of points that are in the calculation (not including points that have been removed) are shown.
Select the display options, including precision, text color, perimeter lines, point markers, meter direction indicators, and labeling.
Specify the Z coordinates of the first and third input points. You will have the option to change these values, if desired, when creating the grid. By default, both values are set to zero. If you selected Horizontal meter and grid the Z-coordinate for first and third points will always be the same.
If desired, specify Isoline contouring and Highlight Values by clicking on the appropriate buttons.
Click Ok. Control is now transferred to the drawing area to locate the grid.
To change the grid elevation, move the cursor into the Z-Coord text box and enter a new value or use the up and down arrow keys on the keyboard, before clicking the first point. Locate the first point of the grid and click the left mouse button.
Drag the cursor to the second point on the grid and left click again. This step defines the baseline of the grid.
Drag the cursor to the right corner of the grid and click the left mouse button one more time. This final step specifies the extents of the grid perpendicular to the baseline. By default, the Z coordinate will echo the first point's elevation or the predefined third point elevation (see step 7). To change the elevation for the third point, before clicking move the cursor into the Z-Coord text box and enter a new value or use the up and down arrow keys on the keyboard. You can not slope a plane if Horizontal meter and Grid are selected.

NOTES:

If Meter Indicator is selected (default condition: not selected), there will be a little line extending from the point showing the direction that the light meter is facing to "collect" light.
The meter indicators are "off" by default. They may be turned on by unchecking the appropriate box in the dialog. Compatibility with earlier versions: If selected, meter indicators will be displayed in older versions of AGi32 until the calc points are edited.