Setting up Snap Modes enables the user to determine which points will be used as snap points when drawing in Opus. These are selected using the Snap Toolbar within Opus.
Sensitivity The Sensitivity option determines the distance the cursor has to be from the snap point before it automatically snaps into place. Move the slider to the right to make the cursor snap more easily.
Ortho Mode : Full
If the option is enabled, opus will only draw lines at 0, 90, 180 or 270 degrees. Simply point the cursor in roughly the right direction and enter a value. Ortho Mode : Full can be toggled by pressing the F8 key.
Partial
The Partial mode is similar to the Ortho Mode : Full. This causes Ortho mode to apply when the cursor has snapped to a snap point.
Element Start / End
The beginning and end of a line or other element.
Element Mid Point
The centre point on a line or other element.
Arc Centre The centre of an arc or circle.
Snap to Extents
The original point where the corner would meet, even if the corner is chamfered or filleted or the original centre of the part, even if the part has been edited and the centre point has changed.
Quadrant of Arc
Snaps to the four cardinal points of the compass on an arc.
Intersection Point
The point where two elements cross.
Reference Points
The user defined reference points that have been inserted into the drawing.
Snap to Nearest
Snaps the cursor to the point on the element that is closest to it. This is not, generally, a useful snap mode.
Grid Point
Grid points can be toggled on or off by clicking on this icon.
Tangents
The tangent of a circle or arc - this is relational to the element that is being snapped at the time.
Object Snap Tracking
Use object snap tracking to track along alignment paths that are based on object snap points. Acquired points display as a Yellow Square, and you can acquire up to seven tracking points at a time. After you acquire a point, horizontal, vertical, or polar alignment paths relative to the point are displayed as you move the cursor over their drawing paths. For example, you can select a point along a path based on an object endpoint or midpoint or an intersection between objects.