HD99769: FSS : Isophotes Analysis : Display result of Isophotes analysis is incorrect on the specific surface.

APAR status

• Closed as Permanent restriction.

Error description

• SCENARIO:
  Display result of Isophotes Mapping analysis is incorrect on
  the specific surface.
  EXPECTED RESULT:
  Display result of Isophotes Mapping analysis should be
  correct on the specific surface.
  

Local fix

• empty
  

Problem summary

• SCENARIO:
  Display result of Isophotes analysis is incorrect on the
  specific surface.
  EXPECTED RESULT:
  Display result of Isophotes analysis should be correct on the
  specific surface.
  

Problem conclusion

• THIS PROBLEM IS PERMANENT RESTRICTION IN CATIA
  Additional Closure Information:
  .
  INCIDENT DIAGNOSIS:
  The old Isophote mapping analysis command shows discontinuity
  on specific surface which has long and very thin triangles.
  .
  RESTRICTION EXPLANATION:
  The old Isophote mapping analysis command is based on classic
  shading process which uses linear interpolation method.  The
  results are computed between two vertices of triangle to
  process the color results. However this method does not give
  good result whenever there is long and thin triangles
  (tessellation) because the results are linearly interpolated.
   As the length of triangle increases, interpolation also
  increases which results in high approximation.
  This problem has been solved in new command using OpenGL
  Shader mode in which results are computed on each pixel and
  not on each vertex and hence it gives more precise results on
  long and thin triangles .
  However it is not possible to implement OpenGL Shader mode in
  the old Isophote analysis command because architecture is
  completely different compared to new command and graphic
  material is managed is differently in old command.
  Therefore it is recommended to activate Enable OpenGL Shader
  option(Tools / Option / General / Display / Performance ) and
  Use new Isophote mapping Analysis command.
  .
  By-pass: None
  

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