NXcg_alpha_complex

Status:

base class, extends NXobject

Description:

Computational geometry description of alpha shapes or wrappings to primitives.

For details see:

in CGAL, the Computational Geometry Algorithms Library. As a starting point, we follow the conventions of the CGAL library.

Symbols:

The symbols used in the schema to specify e.g. dimensions of arrays.

d: The dimensionality of the alpha shape, for now 2 or 3.

n_e: The number of edges.

n_f: The number of faces.

n_c: The number of cells.

Groups cited:

NXcg_point_set, NXcg_tetrahedron_set, NXcg_triangle_set

Structure:

dimensionality: (optional) NX_UINT {units=NX_UNITLESS}

Any of these values: 2 | 3

type: (optional) NX_CHAR

Specify which general type of alpha shape is computed. Using for now the CGAL terminology. Basic means (unweighted) alpha shapes. Alpha_wrapping means meshes created using alpha wrapping procedures.

Any of these values: convex_hull | alpha_shape | alpha_wrapping

mode: (optional) NX_CHAR

Specifically when computed with the CGAL, the mode specifies if singular faces are removed (regularized) of the alpha complex.

Any of these values: general | regularized

alpha: (optional) NX_NUMBER {units=NX_LENGTH}

The alpha, (radius of the alpha-sphere) parameter to be used for alpha shapes and alpha wrappings.

offset: (optional) NX_NUMBER {units=NX_LENGTH}

The offset distance parameter to be used in addition to alpha in the case of alpha_wrapping.

point_set: (optional) NXcg_point_set

Point cloud for which the alpha shape or wrapping should be computed.

triangle_set: (optional) NXcg_triangle_set

Triangle soup for which the alpha wrapping should be computed.

triangulation: (optional) NXcg_triangle_set

A meshed representation of the resulting shape.

interior_cells: (optional) NXcg_tetrahedron_set

Hypertext Anchors

List of hypertext anchors for all groups, fields, attributes, and links defined in this class.

NXDL Source:

https://github.com/FAIRmat-Experimental/nexus_definitions/tree/fairmat/contributed_definitions/NXcg_alpha_complex.nxdl.xml