Reference on Topology/Tessellation

Types

	A3DMiscReferenceOnTopologyData
	A3DMiscReferenceOnTessData

Functions

A3DStatus	A3DMiscReferenceOnTopologyGet()
A3DStatus	A3DMiscReferenceOnTessGet()
A3DStatus	A3DMiscReferenceOnTessCreate()
A3DStatus	A3DMiscReferenceOnTopologyCreate()

Detailed Description

group a3d_reference_on_topo

Creates and accesses entities that reference topological entities and that specify globally-defined attributes.

Entity type is kA3DTypeMiscReferenceOnTopology.

Version

2.0

Referenced topological entities are retrieved by indexes which are meaningful in the context of their parent element.

For a A3DTopoConnex, it needs:

• the A3DTopoConnex index on the current A3DTopoBrepData.

For a A3DTopoShell, it needs:

• the A3DTopoShell index on the current A3DTopoBrepData. It is a index which is global to the BrepData. In the case of several A3DTopoConnex, it must take into account the number of shells present in the preceding A3DTopoConnex.

  A3DUns32 uiShellIndex = 0;
  for all pConnex on A3DTopoBrepData
  {
      for all pShell on pConnex
      {
          if pShell is wanted
              return uiShellIndex;
          uiShellIndex++;
      }
  }
  

For a A3DTopoFace, it needs:

• the A3DTopoFace index on the current A3DTopoBrepData. It is a index which is global to the BrepData. In the case of several A3DTopoConnex, it must take into account the number of faces present in the preceding A3DTopoConnex.

  A3DUns32 uiFaceIndex = 0;
  for all pConnex on A3DTopoBrepData
  {
      for all pShell on pConnex
      {
          for all pFace on pShell
          {
              if pFace is wanted
                  return uiFaceIndex;
              uiFaceIndex++;
          }
      }
  }
  

For a A3DTopoEdge or A3DTopoCoEdge, it needs:

• the A3DTopoFace index on the current A3DTopoBrepData (see index need for A3DTopoFace reference).
• the A3DTopoLoop index on the current A3DTopoFace.
• the A3DTopoCoEdge index on the current A3DTopoLoop.

For a A3DTopoVertex, it needs:

• the A3DTopoFace index on the current A3DTopoBrepData (see index need for A3DTopoFace reference).
• the A3DTopoLoop index on the current A3DTopoFace.
• the A3DTopoCoEdge index on the current A3DTopoLoop.
• the A3DTopoVertex index on the current A3DTopoEdge. Is set to 0 for the start vertex, and 1 for the end vertex.

Function Documentation