3D Cursor Tools
October 2001
The 3D Viewer's 3D cursor is a handy tool for identifying not only XYZ locations in your model, but also the fault block and zone names and the dip and dip azimuth of surfaces at those locations. By marking two locations, distances can also be measured. The plunge and trend of a line or the strike and dip of a plane can be measured when two or three 3D cursor locations (respectively) are marked.
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To see this type of information, turn on the 3D cursor and the Snap to Surface function in the 3D Cursor menu (alt-z). Click with the middle mouse button on a model surface; the 3D cursor immediately moves to that location. The 3D cursor can be dragged to a specific location by holding the middle mouse button. The 3D Cursor window appears displaying the names of the fault block and zone as well as the dip and dip azimuth of the selected surface.
To measure the distance from one point in the model to another, move the 3D cursor to the desired location (using the middle mouse button) and push the Mark1 button (also on the 3D Cursor menu) or use the alt-m hot key to mark the first location. Then snap the cursor to the second point in the model. The 3D Cursor window now displays the distance, vector plunge, and vector bearing of the line formed by the "marked" 3D cursor location and the current 3D cursor location (as well as the XYZ locations of the end points).
To measure the strike and dip of a plane, simply mark the first 3D cursor location, then a second 3D cursor location (using the Mark2 button or the alt-n hot key). Once the 3D cursor is moved to a third location, a transparent plane is shown between the three points and the 3D Cursor window is updated to contain the XYZ locations of all three points as well as the strike and dip of the plane formed by those three points.
The 3D Cursor itself can be used for measuring distances: the axes are marked at user specified distances, with every tenth marking separated by an additional small disk. The distance markings can be set separately for XY versus Z and the cross at the center of the 3D cursor can be displayed with markings one tenth that of its axes. All of these features are controlled on the 3D Cursor menu.
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Last updated: March 22, 2007