Optimizing V4 Migration: Deactivation of the No Show Filter

When copy/pasting V4 space data, duplication of geometries inside a same family is avoided. The main reason is that some elements such as Faces require the migration of underlying entities such as Surfaces, but the Surfaces may also have been migrated explicitly. The purpose is to analyze the set of objects migrated and to extract the representative entities. Here in this task, environment variables allow the user to deactivate these filters and to migrate all the V4 features.

This task shows you how to:

Before you begin: The following elements will no longer be converted:
  • Border curves of migrated Faces (since they would duplicate face edges).
  • Surfaces that are support of migrated faces (since they are already migrated as support of the faces).
  • Faces included in a migrated Skin or Volume (since they have been migrated through the skin or the volume and are accessible through those federating elements).
  • Volumes and Skins used in migrated solids (solids containing Volume or Skin/split primitives for instances) since they are already migrated through the solid primitive.
  • Elements in Hide, except Solids (SOLIDE or SOLIDM): The management of Hide/Show should be independent from families. However some border effects have convinced us the two behaviors should be associated: for instance if the model contains a Skin in Hide, whereas its faces are in Show space, migrating the Skin and not the Faces separately would not provide the required result.

    This can result in dramatic improvements in terms of conversion performance, memory consumption and 3D Shape size.The conversion can be operated on those representative entities only.

    Note that the element can still be copy-pasted when selected individually, or if the element it belongs to is not migrated in the same transaction.

    This enhancement is automatically in use when copy/pasting V4 space data into a 3D Shape.

CATIA V6 behavior without the environment variable (when the filter is activated)

This task describes the CATIA V6 behavior without the environment variable (when the filter is activated).

  1. Open a model in CATIA V6:



    Environment variables are provided to disable this behavior (filters):


    The following scenarios deal with the first environment variable (set KEEP_HIDDEN_ELEMENT=1). For more information about the second environment variable, please refer to Optimizing V4 Migration: Deactivation of the Parent Filter of V4 Elements.

  2. Click Swap visible space to visualize the No Show space:



    The elements CRV17 and SUR1 contained in the *MASTER are in the No Show space.

  3. Copy *MASTER and paste special it in a 3D Shape using the CATIA_SPEC option.

  4. Update the 3D Shape.



  5. Click Swap visible space :



    CRV17 and SUR1 which were in the No Show space in the model have not been migrated in CATIA V6.

    When you have a Skin containing a Face, only one feature "Skin" without Curve borders and Face is migrated. This is a means to avoid duplication of similar features.

Functionality scope:

  V4 model V6 Representation
With Filter 1 Skin in Show + 1 Face in No Show

1 Skin in Show

no Border Curve

no Face
1 Skin in No Show + 1 Face in Show Face in Show
1 Face + 1 Surface + Border Curves in Show

1 Face

no Border Curve

no Surface
1 Face in No Show + Border Curves in Show Border Curves in Show
1 Surface in No Show + Curves in No Show

no Surface in No Show

no Curves in No Show
1 Surface in No Show + Curves in Show Curves in Show
When the No Show Filter is deactivated 1 Skin in Show + 1 Face in No show 1 Skin in Show + 1 Face in No show
1 Skin in No Show + 1 Face in show

Skin in No Show

No element in No Show
1 Face + 1 Surface + Border Curves in Show

1 Face

no Border Curve

no Surface
1 Face in No Show + Border Curves in Show 1 Face in No Show + Border Curves in Show
1 Surface in No Show + Curves in No Show 1 Surface in No Show + Curves in No Show
1 Surface in No Show + Curves in Show 1 Surface in No Show + Curves in Show

CATIA V6 behavior with the environment variables (when the filter is deactivated)

This task describes the CATIA V6 behavior with the environment variables (when the filter is deactivated).

  1. You can deactivate the No Show Filter by entering the following command:

    set KEEP_HIDDEN_ELEMENT=1

  2. Open a model in CATIA V6.

  3. Copy *MASTER and paste special it in a 3D Shape using the CATIA_SPEC option.

  4. Update the 3D Shape.



  5. Click Swap visible space :



    It is now possible to visualize the Curve and Surface in the No Show space.