Autodesk 05726-091452-9060 User Guide - Page 182

12 Tracing The Table describes the parameters of the Trace tab. Parameter Description Line Follow Orthogonalization If this option is on, then the line following tracing automatically aligns segments of created polylines perpendicular to each other. All segments become either perpendicular or parallel with the base angle. The base angle is set in the Base angle box of the Options tab. If the Auto checkbox is on, then the program automatically defines the base angle by the direction of the polylines longest segment. The Approximation Accuracy setting in the Options tab controls the maximum angle of deviation that segments can have in relation to the Base angle and still fall under orthogonalization. You can use this option when tracing raster objects consisting of perpendicular segments, for example, when tracing buildings on plans. Auto estimate base Sets the mode which automatically defines the base direction angle of polyline segments orthogonalization. The base angle for each traced polyline is defined separately. Base Angle Ÿ Enter an angle specifying the base direction of orthogonalization. - or - Ÿ Click the button at the box name and specify two points on the image. The angle value between the line connecting these points and the axis X will be shown in the Base angle. Setting on Auto estimate base angle has the higher priority over this option. Auto Detect Direction Sets the mechanism by which the program will automatically define the direction of tracing. After the program reaches a node, it tries to find the following raster line part, which is an extension of the traced object. Pause Sets a period in seconds, during which you should choose a segment to extent tracing when the Auto Detect Direction mode of tracing extension is on. Unless the user specifies manually any other extension for the indicated period, the program will continue tracing in the automatically selected direction. Setting Pause to 0 disables this option. Place vertex on nodes If this checkbox is on,when tracing polylines, then the program inserts vertices at intersections of a generated vector polyline with raster objects (nodes). 187