Composite Geometry

The virtual geometry module has the capability to combine a set of connected curves into a single composite curve, or a set of connected surfaces into a single surface. The general purpose is to suppress or remove the child geometry common to those entities being composited. For example, compositing a set of curves suppresses the vertices common to those curves, thus removing the constraint that a node must be placed at that vertex location.

To use the composite create operation

  1. On the Command Panel, click on Geometry.
  2. Click on Surface or Curve.
  3. Click on the Modify action button.
  4. Select Composite from the drop-down menu.
  5. Enter in the appropriate settings for Surface ID(s) or Curve ID(s). This can also be done using the Pick Widget function.
  6. Select Create from the Select menu and enter in the appropriate settings.
  7. Click Apply.

Composite Create {Surface|Curve} <id_list>

This command will composite as many surfaces (or curves) as possible, in many cases creating multiple composites.

The entities combined to create the composite must either all be unmeshed or all be meshed. A meshed composite surface can not be removed unless the mesh is first deleted.

Care should be taken when compositing over large C1 discontinuities as it may cause problems for the meshing algorithms and may result in poor quality elements. C1 discontinuities are corners or abrupt changes in the surface normal.

To use the composite delete operation

  1. On the Command Panel, click on Geometry.
  2. Click on Surface or Curve.
  3. Click on the Modify action button.
  4. Select Composite from the drop-down menu.
  5. Enter in the appropriate settings for Surface ID(s) or Curve ID(s). This can also be done using the Pick Widget function.
  6. Select Delete from the Select menu.
  7. Click Apply.

Composite Delete {Surface|Curve} <id>