Polygonal Shape Creation


The edit toolbar.


Polygonal Shape Creation

Select the Polygonal Shape Creation tool. Click into the viewport to create the first vertex, further clicks create additional vertices. To finish the shape, you can either click on the first vertex or perform a double click. Alternatively, press ESC to cancel or Enter to finish drawing.

Simple snapping: By moving the cursor over existing shapes or the terrain you can snap the position to those objects. A orange rectangle is shown around the cursor when snapping is active. Additionally the snapped component is highlighted. Snapping can be prevented by hiding layers or using the isolation mode.

Snapping to features: After the first click, multiple snapping features are enabled. These include: Global axes, 90 degree angles, parallel lines, extensions of lines and line midpoints. All snapping features are automatically intersected to form combined snapping results. While moving the mouse, a orange dashed line is shown whenever snapping to such a feature occurs. Additionally, symbols are shown to differentiate the features:


Types: (a) global axis or line extension (b) 90 degree (c) parallel (d) midpoint (e) vertex (f) combined

Splitting shapes: When the first and last vertices are snapped to an edge or vertex of the same polygon, and the whole line is contained in this polygon, the polygon is automatically split into two parts. Here is an example:


Start by creating a simple shape. Then move the cursor over the left edge until it is highlighted in orange, indicating snapping. Click to create the first vertex, then click another few times in the polygon for further vertices. Snap to the right edge, and click again, to split the shape.

Automatic closing: When the first point snaps to a shape, and the last point snaps to a line that is indirectly connected to the first point, the polygon is automatically closed along the indirect connection, as shown here:


Combine versus Add: By default, when you snap to a existing shape while creating a new one, the new shape is automatically merged with the existing shape. To prevent this, an create separate shapes instead, hold the SHIFT key while drawing the shape.

Text entry: Click on the numerical input, enter three values and press ENTER. This creates the first point at those coordinates. You can now move the mouse, the text field shows the length of the line. While moving the mouse, you can directly start typing, without clicking on the text box, to enter a length or another coordinate. When you enter one value and press ENTER, the current line is colored magenta, and the length is fixed at this value. A click or ENTER creates another point, ESC returns to a unrestricted mouse move. Entering three values and pressing ENTER immediately creates a new point.

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