A3DTopoContextData

Fields

`A3DUns8`	`m_ucBehaviour`
`A3DDouble`	`m_dGranularity`
`A3DDouble`	`m_dTolerance`
`A3DBool`	`m_bHaveSmallestFaceThickness`
`A3DDouble`	`m_dSmallestThickness`
`A3DBool`	`m_bHaveScale`
`A3DDouble`	`m_dScale`

Detailed Description

struct A3DTopoContextData

Structure for parsing or creating an A3DTopoContext entity.

The m_ucBehaviour member is an array of bits that uses values from the topology context bitmask definitions (Topology Context Data).

Version: 2.0

Note

m_dScale is a conversion factor from the unit of the part (which is not mandatory millimeters) to the “unit” of the modeling kernel. In fact, there is NO notion of physical unit at the level of the “TopoContext”. The numbers that are stored there do not have a physical significance by themselves. To interpret them, you should take into account the unit of the part and the “TopoContext” context scale. Then, there can be further scale on the product hierarchy that should be taken into account when converting entities while respecting a given accuracy towards original geometry.

Public Members

A3DUns8 m_ucBehaviour: Array of bits.

A3DDouble m_dGranularity: Minimal size of an edge. This value is non-dimensional.

A3DDouble m_dTolerance: Global base tolerance used in the context for topological elements. This value is non-dimensional.

A3DBool m_bHaveSmallestFaceThickness: True if next member is valid.

A3DDouble m_dSmallestThickness: Smallest thickness for a face. Used in internal loop treatment. Default should be 100 * m_dGranularity.

A3DBool m_bHaveScale: True if next member is valid.

A3DDouble m_dScale: Optional scale to interpret the data of the context.