Vulcan - Snap Modes | Mining University

Vulcan - Snap Modes

Vulcan snap modes are a powerful tool that allows the user to snap to the exact point specified.  Using snap modes is an important part of creating drafting objects that are precise and accurate.

Whether you know it or not, if you have been digitizing objects in Vulcan, you have been using snap modes.  The default snap mode is called 'Indicate.'  This mode allows the user to specify a point anywhere on screen.  This point will have the easting and northing coordinates of the point that was clicked, but what about the elevation?  If the point was digitized in plan view (click the 'Reset' icon a few times) the point will be at the elevation specified in the 'z' field of the 'Status' toolbar.  If the point was digitized while in a rotated view the elevation of the point (and possibly the easting and northing coordinates) will be at a seemingly random location defined by the Vulcan software.  This tendency for randomness is a big reason that the other snap modes exist.

Just below the primary window and on the left (if you haven't changed the Vulcan layout) you will find the 'Digitise' toolbar (Australian spelling by design).  The first five icons from the left are the snap modes.  The first one is the 'Indicate' snap mode and should be depressed.  The next icon over is called the 'Object' snap mode.  This mode will snap the digitized point to the nearest point or line object.  The elevation coordinate (and northing and easting coordinates in rotated view) is controlled by this intersection with the existing object.  While using the 'Object' snap mode, if you click a point too far away from any object, no point will be created and a warning sound will be played.  This is not a problem, just click the next point closer to an existing object.

The next snap mode, 'Point' snap, is similar to the 'Object' snap mode except that it will only snap to the nearest point or end of line segment.  Again, if a point is clicked too far away from an existing object a warning sound will be heard and no point will be created. 

When working with the 'Point' snap mode sometimes the digitized point will snap to the other end of an indicated line segment even though the cursor is almost exactly above the desired point.  When this occurs, the easiest solution is to click on the line segment about a quarter of the entire segment length away from the desired point.  This will still snap to the desired location and avoid the random snap to the other endpoint.  I don't know why this happens but I think it has to do with the graphics driver.

The fourth snap mode is the 'Smart' snap.  The 'Smart' snap mode will snap to specific object locations (endpoint, midpoint, intersection, etc...) much like AutoCAD.  This is very useful to people with a background in drafting.  Right click on the icon to view the snap properties.  This snap mode does not work with all Vulcan digitizing tools.  It is being added on a discretionary basis as needed.  Right now I do know that it definitely works with digitizing points, lines and polygons.

The last mode is the snap to 'Grid' mode.  In order to use this mode you must first turn on a Vulcan grid.  On the 'Graphics' toolbar click the 'Toggle Grid Display' icon.  The snap to 'Grid' mode will snap points to the intersection of grid coordinates.  Right click on the 'Toggle Grid Display' icon to view more options for displaying the grid.

Now that you are familiar with the various Vulcan snap modes, digitizing data will be faster and more efficient as well as more accurate.

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