HD52727: GSD / VARIABLE OFFSET / VARIABLE OFFSET CREATE NON-TANGENT SURF ACES.

APAR status

• Closed as Permanent restriction.

Error description

• GSD / VARIABLE OFFSET / VARIABLE OFFSET
  CREATE NON-TANGENT SURFACES.
  .
  SCENARIO:
  1.Open provided CATPart.
  2.Click on Variable offset icon. Variable offset
  definition dialog box appears.
  3.Select Surface.4 as Global Surface.
  4.Select the Boundary.3 and Value as 0mm.
  5.Select the Surface.4 and Value as Variable.
  6.Select the Boundary.4 and Value as minus 2mm
  (- 2 mm).
  7.Turn off the Constant Offset if you want input
  variable in the Value field.
  8.Click OK to Variable offset definition dialog box.
  9.Select view mode as Shading with Edges without
  Smooth Edges.
  .
  OBSERVATION:
  Five Internal Edges appear. It means Continuous in
  tangency is inferior.
  .
  

Local fix

Problem summary

• GSD / VARIABLE OFFSET / VARIABLE OFFSET CREATE NON-TANGENT SURF
  ACES.
  GSD / VARIABLE OFFSET / VARIABLE OFFSET
  CREATE NON-TANGENT SURFACES.
  .
  SCENARIO:
  1.Open provided CATPart.
  2.Click on Variable offset icon. Variable offset
  definition dialog box appears.
  3.Select Surface.4 as Global Surface.
  4.Select the Boundary.3 and Value as 0mm.
  5.Select the Surface.4 and Value as Variable.
  6.Select the Boundary.4 and Value as minus 2mm
  (- 2 mm).
  7.Turn off the Constant Offset if you want input
  variable in the Value field.
  8.Click OK to Variable offset definition dialog box.
  9.Select view mode as Shading with Edges without
  Smooth Edges.
  .
  OBSERVATION:
  Five Internal Edges appear. It means Continuous in
  tangency is inferior.
  .
  

Problem conclusion

• THIS PROBLEM IS PERMANENT RESTRICTION IN
  CATIA
  .
  Incident Diagnosis
  The variable offset surface is not smooth. Some
  edges becomes sharp.
  .
  Restriction Explanation:
  Variable offest does not preserve the tangency
  continuity for surface with no curvature continuity.
  .
  The tangency gap depend of two number :
  the product between the curvature discontinuities
  and offset value (= around 0.25 here).
  the slope of the law of offset value (high here : one
  warning "high variation" is diplayed).
  If one of them is low then the tangency gap must
  be low.
  .
  By-Pass:
  Perform one healing with tangency on the variable
  offset surface with the following parameters
  - Continuity : Tangent
  - Tangency Angle : 3.2 deg (> tangency gap)
  .
  

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

Applicable component levels