A3DRWParamsTessellationData

struct A3DRWParamsTessellationData

Structure to set the tessellation parameters.

3.0

Variables

A3DETessellationLevelOfDetail A3DRWParamsTessellationData.m_eTessellationLevelOfDetail
A3DETessellationLevelOfDetail

Enum to specify predefined values for some following members.

A3DDouble A3DRWParamsTessellationData.m_dChordHeightRatio
A3DDouble

Specifies the ratio of the diagonal length of the bounding box to the chord height.

A value of 50 means that the diagonal of the bounding box is 50 times greater than the chord height. Values can range from 50 to 10,000. Higher values will generate more accurate tessellation.

A3DDouble A3DRWParamsTessellationData.m_dAngleToleranceDeg
A3DDouble

Specifies the maximum angle between two contiguous tessellation segments describing the curve of a topological edge for every face.

During tessellation, the curve describing the edge of a topological face will be approximated using straight line segments. m_dAngleToleranceDeg is the maximum angle between two consecutive segments.

Allowable values range from 10 to 40. Lower values will result in greater accuracy.

A3DDouble A3DRWParamsTessellationData.deprecated_m_dMinimalTriangleAngleDeg

deprecated

A3DDouble

Specifies the angle between two contiguous segments of wire edges for every face.

Allowable values range from 10 through 30. DeprecatedThis is a deprecated feature, which will be removed in version 2026.1.0.

A3DDouble A3DRWParamsTessellationData.m_dMaxChordHeight
A3DDouble

Specifies the maximum distance between the original geometric surface specified in the CAD file and the resulting tessellation.

m_dMaxChordHeight is ignored if m_bUseHeightInsteadOfRatio isn’t set to true.

Be careful, very small values can generate very large tessellation files.

Conversely, very large values can generate inaccurate tessellation. In such cases, it may be better to use the m_dChordHeightRatio member to scale this value relative to the object that’s being tessellated.
A3DBool A3DRWParamsTessellationData.m_bAccurateTessellation
A3DBool

Accurate tessellation.

Uses standard parameters. ‘A3D_FALSE’ indicates the tessellation is set for visualization. Setting this value to ‘A3D_TRUE’ will generate tessellation more suited for analysis. Can be used with all TessellationLevelOfDetails.

A3DBool A3DRWParamsTessellationData.m_bAccurateTessellationWithGrid
A3DBool

Enable accurate tessellation with faces inner points on a grid.

A3DDouble A3DRWParamsTessellationData.m_dAccurateTessellationWithGridMaximumStitchLength
A3DDouble

Maximal grid stitch length.

Disabled if value is 0. Be careful, a too small value can generate a huge tessellation. Given in model units multiplied by the net scale of the Representation Item.

A3DBool A3DRWParamsTessellationData.m_bAccurateSurfaceCurvatures
A3DBool

Take into account surfaces curvature in accurate tessellation to controle triangles elongation directions.

Enable m_bAccurateTessellation or m_bAccurateTessellationWithGrid to use this option.

A3DBool A3DRWParamsTessellationData.m_bDoNotComputeNormalsInAccurateTessellation
A3DBool

Do not compute surface normals in accurate tessellation.

Enable m_bAccurateTessellation or m_bAccurateTessellationWithGrid to use this option.

A3DBool A3DRWParamsTessellationData.m_bKeepUVPoints
A3DBool

Keep parametric points as texture points.

A3DBool A3DRWParamsTessellationData.m_bUseHeightInsteadOfRatio
A3DBool

Use m_dMaxChordHeight instead of m_dChordHeightRatio if m_eTessellationLevelOfDetail = kA3DTessLODUserDefined.

A3DDouble A3DRWParamsTessellationData.m_dMaximalTriangleEdgeLength
A3DDouble

Maximal length of the edges of triangles.

Disabled if value is 0. Be careful, a too small value can generate a huge tessellation.