BrepData

Entity type is kA3DTypeTopoBrepData.

Orientations

Here are some important points about A3DTopoBrepData entity orientation:

  • Edges are implicitly oriented from the Start vertex toward the End vertex.
  • 3D curves referenced by edges are oriented from the Start vertex toward the End vertex.
  • Orientation with loop, which relates to the corresponding edge.
  • Orientation UV with loop, which relates to the space parametric curve attached to the co-edge, if defined.
  • Co-edge has two flags that describe orientation:
  • Loop is oriented regarding Ampere rule (in surface parametric space).
  • Surface is oriented with the shell so that normals point from the material to the void.

Generally, a face containing a hole is defined with two loops having the same orientation. The outside loop is defined by the m_uiOuterLoopIndex member of an A3DTopoFaceData structure, regardless of orientation. To get the real face normal vector, you must consider the surface normal vector and the m_pucOrientationWithShell member of the A3DTopoShellData structure.

sa A3DTopoBrepData, A3DTopoBrepDataData, A3DTopoBrepDataGet, A3DTopoBrepDataCreate

Returns

A3D_SUCCESS on success, or an error code on failure

Structures

Functions