Correction of geometric defects: about

Modes of correction of defects

The correction of defects can be carried out in two ways:

automatically: using algorithms of correction / simplification of the geometry

manually: using specific tools

Automatic correction

The automatic correction enables to correct the following geometric defects:

superimposed points
superimposed lines
intersection line-line
intersection line-face

Note: The automatic correction is planned especially for the 2D geometry, the result in 3D is not guaranteed.

Automatic simplification

The simplification is used to simplify or "reduce" the geometry. The algorithm of automatic simplification removes some lines and points by assembling the lines of the same type.

Only the lines of the following types can be fused:

segments located on the tangent of the straight lines
arcs of circle having the same angle of curve

Manual correction

The manual correction is used:

on the one hand to correct the geometric defects by defect type
on the other hand to simplify the geometry manually

The commands of manual correction for each defect are presented in the table below.


To correct the geometric defect …	use the software command …	Expected result
Intersection line-line (particular case)	Cut a line on a point	Cutting of the line with the insertion of the new point
Intersection line-line (general case)	Cut two lines on their intersection	Cutting of two lines and insertion of the new point
Entirely superimposed lines: Partially superimposed lines:	Cut two lines on their intersection	Cutting and confusion of the lines
Open wire	Extend line to point / Extend line to line	Closing of contour by prolongation of a line and suppression of a point
Abnormal line	No software command *
Abnormal line (value fixed by the user)	Reduce continuous lines in one line	Fusion of the lines in one line
Abnormal face	No software command *
Abnormal face (value fixed by the user)	Merge two lists of lines	Confusion of the lines and removal of the face

Note: * To correct the geometric defects of abnormal line / face type, the user must decrease absolute precision by reducing relative precision (relative epsilon).

Types of fusion

There are 3 reduce types for the command Reduce continuous lines in one line:

Automatic
Arc
Segment

The choice of the reduce type depends on the types of lines. Some precautions concerning the choice of the reduce type and the type of lines to be reduced are necessary to preserve the geometry of the device.

Some examples of fusion with the different types of fusion are presented in the table below.


To reduce …	use the reduce type …	Expected result
two lines of type Segment	Automatic / Segment	Creation of a new line of the Segment type replacing two lines of the Segment type
two lines de type Arc	Automatic / Arc	Creation of a new line of the Arc of circle type replacing two lines of the Arc type
a line of the Segment type and a line of the Arc type	Arc	Creation of a new line of the Arc of circle type replacing two lines of the Segment and Arc types
a line of the Segment type and a line of the Arc type	Segment	Creation of a new line of the Segment type replacing two lines of the Arc and Segment types