Graphics Programs Reference
In-Depth Information
Let's select features, or points, on the table. You will define the ground plane on
two axes. One for the axis going from the camera forward—the Z axis. The other
going across, perpendicular to the camera—the X axis. Start with the Z axis.
7. In Viewer2, which is showing in the 2D view, select two points along the right
side of the table. They should be far apart. Just click the first one and then Shift-
click the second one.
Notice that when you're selecting points in the 2D view they are highlighted in
the3Dview.Makesurethepointsyouselectarepartofthemainpointcloudarea
representing the table in the 3D view.
You can see the two points I selected in FIGURE 10.21 , both in 2D and 3D view.
Figure 10.21. Selecting points from the point cloud.
To define what the points represent, use the contextual menu.
8. Right-click (Ctrl-click) anywhere in the 2D Viewer. From the contextual menu
choose Ground Plane, then Set Z ( FIGURE 10.22 ) .
Figure 10.22. Setting the ground plane's Z axis.
 
 
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