# A3DMiscReferenceOnTopologyData

struct `A3DMiscReferenceOnTopologyData`

  Structure that identifies the referenced topological entity and that specifies globally-defined attributes.

  > 2.0

  `m_puiAdditionalIndexes`contains indexes on different topological elements (see Reference on Topology/Tessellationfor explanation).

  For reference on `A3DTopoEdge`or `A3DTopoCoEdge`, `m_uiSize`must be set to 3 and

  - `m_puiAdditionalIndexes`[0] is the `A3DTopoFace`index in the `A3DTopoBrepData`
  - `m_puiAdditionalIndexes`[1] is the `A3DTopoLoop`index in the `A3DTopoFace`
  - `m_puiAdditionalIndexes`[2] is the `A3DTopoCoEdge`index in the `A3DTopoLoop`.

  For reference on `A3DTopoVertex`, `m_uiSize`must be set to 4 and

  - `m_puiAdditionalIndexes`[0] is the `A3DTopoFace`index in the `A3DTopoBrepData`
  - `m_puiAdditionalIndexes`[1] is the `A3DTopoLoop`index in the `A3DTopoFace`
  - `m_puiAdditionalIndexes`[2] is the `A3DTopoCoEdge`index in the `A3DTopoLoop`
  - `m_puiAdditionalIndexes`[3] is the `A3DTopoVertex`index in the `A3DTopoEdge`referenced by the `A3DTopoCoEdge`. Is set to 0 for the start vertex, and 1 for the end vertex.

  Please notice that features/markups may refer to several linkedItems containing one `A3DMiscReferenceOnTopology`each.

  ## Index

  Variables

  - `m_eTopoItemType`
  - `m_pBrepData`
  - `m_uiSize`
  - `m_puiAdditionalIndexes`

Variables

A3DEEntityType `A3DMiscReferenceOnTopologyData.``m_eTopoItemType`
  `A3DEEntityType`

  Restricted to the type listed in in Referenceable Topological Entities.

A3DTopoBrepData *`A3DMiscReferenceOnTopologyData.``m_pBrepData`
  `A3DTopoBrepData`*

  Body.

  Filled by A3DMiscReferenceOnTopologyGet, Can be NULL. With A3DMiscReferenceOnTopologyCreate it can’t be NULL and must be a `A3DTopoBrepData`.

A3DUns32 `A3DMiscReferenceOnTopologyData.``m_uiSize`
  `A3DUns32`

  The size of `m_puiAdditionalIndexes`.

A3DUns32 *`A3DMiscReferenceOnTopologyData.``m_puiAdditionalIndexes`
  `A3DUns32`*

  Indices to retrieve the topological entity.

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