User's Manual

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5.3 Features
Viewpoint Selection
3D Projection and Distance Measurement
Users can select from the right view, front view, and top view.
Both perspective projection (default) and orthographic projection are supported.
The distance measurement ruler is available only under orthographic projection.
After clicking on , drag your mouse while holding the Ctrl key to make a
measurement in units of meters. Click on again to quit.
Mouse Shortcuts
Distance Reference Circles
Slide the scroll wheel up/down to magnify/minimize
Drag while holding the left button to adjust the point of view
Drag while holding the scroll wheel to pan
NOTE The bottom-left
coordinate axes show the
current point of view
Click on to show/hide the 12 distance reference circles in gray. The actual
distances are marked below.
To change the color and line width of these circles, click on “Tools” in the menu
bar and open “Grid Properties”.