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ISimplex Interface
ISimplex(64) Interface
- GetVertexCount
- GetVertexPosition
- GetFacetNormal
- GetNormal
- GetNormalIndex
- SetNormalIndex
This interface manipulates properties of a single simplex in a mesh.
Two ISimplex instances may have different pointer (or hash etc in higher level
languages) but still represent the same vertex. Use
IObject_KC interface queried from
each to compare the identity of the undelying object with a call to IObject_KC.IsEqual
Quering this interface for each simplex in a mesh should be avoided whenever possible to avoid excessive memory consumption. Consider using IMeshMods and/or other mesh interfaces instead
See also IMesh, IMesh, IVertex,
IInterface List
HRESULT GetVertexCount(int* count )
Parameters
count - [out] - Returned number of vertices in
the simplex. In this product it is always 3.
Returns
- S_OK in case of
success.
- Remarks:
This method returns number of vertices in the simplex. In this product (may
change in future) all
simplexes are triangles, so the return is always 3.
HRESULT GetVertexPosition( int index, int* vertex )
Parameters
index - [in] Index of a
corner of the triangle. Must be 0, 1, or 2.
vertex - [out, retval]
Returned position of the vertex in the vertex list
of the mesh.
Return Values
- S_OK in case of
success.
-
- Remarks:
This method returns position of the index-th
corner in the vertex list of the mesh.
HRESULT GetFacetNormal( double* vx, double* vy, double* vz )
Parameters
vx, vy, vz - [out] - Calculated coordinates of normal to face of
the simplex
Return Values
- S_OK in case of
success.
-
- Remarks:
Returns coordinates of normal to face of the simplex. Note this normal may
be different from normal returned by IMesh.GetNormal() or
IVetrex.GetNormal() The later normals
are applied at vertices of the mesh, which quite often does not coincide with
normal of the face even for regular vertices. The method is provided for
convenience in performing different mesh related calculations.
HRESULT GetNormal(int index, double* vx, double* vy, double* vz )
Parameters
index - [in] Index of a
corner of the triangle. Must be 0, 1, or 2.
vx, vy, vz - [out] - Returned coordinates of normal at the
corner vertex.
Return Values
- S_OK in case of
success.
-
- Remarks:
This method returns coordinates of normal at the index-th
corner of the simplex. When the corner a singular vertex (has several normals)
the correct normal, assigned via SetNormalIndex
below or in some other way, is returned.
HRESULT GetNormalIndex(int index, int* normal)
Parameters
index - [in] Index of a
corner of the triangle. Must be 0, 1, or 2.
normal - [out, retval] - Returned index of
the normal correspondent to this simplex in normal array of the vertex.
Return Values
- S_OK in case of
success.
-
- Remarks:
Returns index of the normal correspondent to this simplex in normal array of
the vertex
HRESULT SetNormalIndex(int index, int normal)
Parameters
index - [in] Index of a
corner of the triangle. Must be 0, 1, or 2.
normal - [in] - 0-based index of the normal
correspondent to this simplex in normals array of the vertex. Must be less than
value returned by IVertex.GetNormalCount
for the correspondent vertex.
Return Values
- S_OK in case of
success.
-
- Remarks:
This methods assigns normal-th normal of normals
array of the vertex as normal related to this simplex.
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