HC00196: CURVE1 / BITGT SPHERE : BAD RESULT FOR 2 CURVES : NOT TANGENT

APAR status

• Closed as unreproducible in next release.

Error description

• CURVE1+BITGT+SPHERE GIVES A BAD RESULT FOR SOME GENERATED CURVES
  .
  SCENARIO:
  --------
  (1) FILE+READ the customer's model containing 2 surfaces
  (2) Select CURVE1+BITGT+SPHERE
      SELECT BLUE *SUR1 AND SELECT GREEN *SUR2.
      KEY IN 3,3 FOR RADII AND PRESS ENTER.
  ====>  BAD BITANGENT CURVES (6 CURVES) ARE CREATED.
  EXPECTED RESULT: TWO SMOOTH (NOT TWISTED) BI-TANGENT CURVES
                   ARE CREATED.
  THE RESULTING CURVES ARE NOT OF GOOD QUALITY. GO TO THE
  SURF1+CURVE FUNCTION AND SELECT EITHIER OF THE LONGER CURVES
  GENERATED BY THE CURV1+BITGT+SPHERE, THE RESULT IS
  NON-TANGENT ARCS . THESE CURVES ARE NOT OF USABLE QUALITY.
  USING SURF1+CURVE THE MESSAGE  NON-TANGENT ARCS   IS STILL
  SHOWN.
  

Local fix

Problem summary

•  INCIDENT DIAGNOSIS:
  CURVE1/BITGT/SPHERE gives a bad result for 2 curves
  

Problem conclusion

Temporary fix

Comments

• THE PROBLEM WAS SUBMITTED ON :
      CATIA VERSION 4 RELEASE 1.7
  .
  THIS PROBLEM IS NOT REPRODUCIBLE ON :
      CATIA VERSION 4 RELEASE 2.4 REFRESH 1 GA level
  REASON:
  It is normal that there are 6 curves solution.
  The small curves correspond also to bitangency curves.
  Nevertheless, there is a small tangent discontinuity within
  curve (0.6 degree). To correct, it we need to improve the
  smoothing algorithm. It can lead to many regressions.
  The SURF1/CURVE works with very strict tolerances.
  If you want to generate an equivalent surface, you can use
  a newer function BLENDSURF. This function is more tolerant :
  BLENDSURF/BTGT LIM (in order to calculate the bitangency
  curves), with the connect option POINT.
  SURF1/CURVE operation was impossible because of a diagnostic of
  poor quality.
  A partial correction has been provided in V423-R1 level.
  

APAR Information

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

  HC00190

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

Modules/Macros

•    FILE
  

Fix information

• Fixed component name

  CATIA FOR SUN

• Fixed component ID

  562640000

Applicable component levels

• R424 PSY

     UP

• RG24 PSY

     UP