HD71925: THE RESULT OF THE "LINE NORMAL TO CURVE" COMMAND IS NOT RIGHT

APAR status

• Closed as user error.

Error description

• Scenario :
  1- File / Open the CATDrawing file
  2- Select the "Line Normal To Curve" icon.
  3- Select the point in "Section cut A-A" View.
  4- Select Line in "Section cut A-A" View.
  Result :
  Line Normal result is not created on the basis of the
  selected point.
  Expected Result :
  The "Line Normal To Curve" command should
  create Line on the basis of the selected point.
  .
  

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

• Incident Diagnosis
  The result of the "Line Normal To Curve" command
  is not right.
  Line Normal result is not created on the basis of the
  selected point.
  Correct Application
  First of all, there are two curves: purple curve is an
  arc of circle and blue one is a spline curve.
  User tries to create a line normal to the blue spline
  curve by selecting a point which is NOT close to this
  curve.
  "Line Normal To" does not create automatically an
  extrapolation curve allowing to find a mathematical
  solution. Consequently, when Sketcher solver
  takes into account the added constraint schema,
  the computed normal line will always stay inside
  the "boundaries" of the spline curve.
  Hereafter a scenario showing that there is no
  mathematical solution which this selection point and
  this spline curve:
  1- Fix the selection point
  2- Fix the spline curve
  3- Create the line normal to as specified in scenario
  Normal line is not created near the selection point
  4- Create a coincidence constraint between the
  fixed selection point and the created line "normal
  to" : "Normal to" line becomes inconsistent due to
  the fact that no mathematical solution exists.
  In addition, as described in the Sketcher
  documentation - "Creating a line normal to a curve
  chapter":
  Lines normal to a curve are created as close as
  possible to where you clicked ON THE CURVE. You
  will get better results if, before clicking the curve,
  you try to position the line as perpendicular to the
  curve as possible.
  To obtain the requested "normal to" line, user has
  to create first a line or a circle to extrapolate
  respectively in tangency or in curvature the spline
  curve and then use this extrapolated curve taking
  into account Skecther's documentation
  explanations.
  Documentation Reference
  Sketcher
  Basic Tasks
  Creating a Line Normal to a Curve
  .
  

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

Applicable component levels