HD22927: SHAPE DESIGN : IMPOSSIBLE TO CREATE THE LOFT SURFACE BY SELECTI NG A GUIDE CURVE

APAR status

• Closed as program error.

Error description

• The customer has created some wireframes.
  He attached the "Multi section Surface" to these
  wireframes. In this time, he met the error message
  when select the Guide Curve. " Multi-sections
  Surface.1 : Sweep operator: The extrusion of
  vertex of the profile leads to a cusp. Use a guide
  with a smaller curvature. "
  .
  Scenario :
  1. Start CATIA and open the provided CATPart
  2. Change the Workbench as "Generative Shape
  Design".
  3. Select the "Multi section Surface" icon
  Select the curve from "SECT1" to "SECT5" as
  section curve.
  Select the curve from "GUIDE_A" to "GUIDE_B" as
  guide curve.
  Select "OK". >> error message is displayed.
  .
  It is possible to create the surface by selecting the
  curve from "GUIDE_B" to "GUIDE_A".
  >> This is a problem.
  .
  Why CATIA can't create the surface by the turn of
  curve selection ?
  CATIA should create the surface by any selection.
  It is possible to avoid the error message by
  using "Deviation" option as "0.01".
  .
  .
  

Local fix

Problem summary

• Shape Design : impossible to create the Loft surface by selecti
  ng a guide curve
  The customer has created some wireframes.
  He attached the "Multi section Surface" to these
  wireframes. In this time, he met the error message
  when select the Guide Curve. " Multi-sections
  Surface.1 : Sweep operator: The extrusion of
  vertex of the profile leads to a cusp. Use a guide
  with a smaller curvature. "
  .
  Scenario :
  1. Start CATIA and open the provided CATPart
  2. Change the Workbench as "Generative Shape
  Design".
  3. Select the "Multi section Surface" icon
  Select the curve from "SECT1" to "SECT5" as
  section curve.
  Select the curve from "GUIDE_A" to "GUIDE_B" as
  guide curve.
  Select "OK". >> error message is displayed.
  .
  It is possible to create the surface by selecting the
  curve from "GUIDE_B" to "GUIDE_A".
  >> This is a problem.
  .
  Why CATIA can't create the surface by the turn of
  curve selection ?
  CATIA should create the surface by any selection.
  It is possible to avoid the error message by
  using "Deviation" option as "0.01".
  .
  .
  

Problem conclusion

• THIS PROBLEM WILL BE FIXED ON CATIA VERSION
  5 RELEASE 14 GA level.
  .
  Incident Diagnosis
  The multisection surface computation fails with error
  message '...leads to a cusp' on a specific modele
  with 2 guides and 5 sections.
  .
  Correction Explanation
  The middle section falls in a hole smaller than Catia
  resolution between sweep computation domains
  computed from guide edges projection on spine.
  Thus a wrong domain is chosen for this section,
  leading to an error in sections interpolation.
  .
  Tolerance management is improved to avoid a bad
  domain choice. The Resulting surface is now
  correct.
  .
  Answer and By-Pass
  Use tolerant modelling options to eliminate guide
  vertices and obtain only one computation domain.
  Or shift section position along the guide by a small
  value.
  Anyway the problem is fixed now.
  .
  .
  

Temporary fix

Comments

APAR Information

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

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

Fix information

• Fixed component name

  CATIA V5/NT/200

• Fixed component ID

  569151000

Applicable component levels

• R514 PSN

     UP