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Part 12 - Set Up Coordinates.
From the main VScad3 "Workspace" menu, select "Region...". The Workspace Region is important in that it defines the default area (in data coordinates) observed by all views. By default, there is only one view and it covers the entire page. Enter values for all three X, Y, and Z ranges as -5,5. Then click on "Apply".
The X and Y ranges control where an entity will appear in a view. For example, if a polyline point lies at the XY data coordinate 1,1, and the Workspace Region XY ranges are set to 0,2, then that polyline point will appear in the center of the view. The Workspace Region Z range controls the clipping of entities. Portions of entities that are outside the Z range are clipped (invisible). Note that the clipping plane positions can be overridden by using the View mode "Eye" dialog. The "Auto Adjust" button is a very handy tool for setting the Workspace Region. The ranges set by "Auto Adjust" will insure that all current entities will be visible in the view. It also ensures that no entities will be clipped in the view when the view is rotated (if the view hasn't been zoomed). When a view is rotated, it is rotated about the point that is located at the center of the Workspace Region.
If you ever load or import geometry into VScad3, and you are not able to see it completely, the first thing to do is "Auto Adjust" the Workspace Region.
Part 13 - Build a Teacup.
Click on the main "Polyline" mode button. The Polyline widgets will appear above the view window. For "Type", select "Spline". "Z plane" controls the Z plane at which the Spline is constructed when clicking to enter points in the view window. Leave this value set to 0. The Open/Closed mode determines if the polyline perimeter is open or closed. Leave it set to "Open". Click the left mouse button on the view window in a few different locations. Click the right mouse button to finish. A smoothly-curved spline is drawn through the points. This illustrates the method of using the mouse to enter points. From the main "File" menu, select "Delete -> Model". The spline (along with any other entities) is deleted.
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