Geometry GenerationÂ¶
Geometry builderÂ¶
- class meshpy.geometry.GeometryBuilder[source]Â¶
- add_geometry(points, facets, facet_hole_starts=None, facet_markers=None, point_markers=None)[source]Â¶
- set(mesh_info)[source]Â¶
Transfer the built geometry into a
meshpy.triangle.MeshInfo
or ameshpy.tet.MeshInfo
.
GeometriesÂ¶
These functions are designed so that their output can be splat-passed to
GeometryBuilder.add_geometry()
:
builder = GeometryBuilder()
builder.add_geometry(*make_ball(10))
- class meshpy.geometry.Marker[source]Â¶
- FIRST_USER_MARKER = 1000Â¶
- MINUS_X = 1Â¶
- MINUS_Y = 3Â¶
- MINUS_Z = 5Â¶
- PLUS_X = 2Â¶
- PLUS_Y = 4Â¶
- PLUS_Z = 6Â¶
- SHELL = 100Â¶
Extrusions and surfaces of revolutionÂ¶
- meshpy.geometry.EXT_OPENÂ¶
- meshpy.geometry.EXT_CLOSED_IN_RZÂ¶
- meshpy.geometry.generate_extrusion(rz_points, base_shape, closure=0, point_idx_offset=0, ring_point_indices=None, ring_markers=None, rz_closure_marker=0)[source]Â¶
Extrude a given connected base_shape (a list of (x,y) points) along the z axis. For each step in the extrusion, the base shape is multiplied by a radius and shifted in the z direction. Radius and z offset are given by rz_points, which is a list of (r, z) tuples.
Returns
(points, facets, facet_holestarts, markers)
, where points is a list of (3D) points and facets is a list of polygons. Each polygon is, in turn, represented by a tuple of indices into points. If point_idx_offset is not zero, these indices start at that number. markers is a list equal in length to facets, each specifying the facet marker of that facet. facet_holestarts is also equal in length to facets, each element is a list of hole starting points for the corresponding facet.Use
set_facets_ex()
to add the extrusion to aMeshInfo
structure.The extrusion proceeds by generating quadrilaterals connecting each ring. If any given radius in rz_points is 0, triangle fans are produced instead of quads to provide non-degenerate closure.
If closure is
EXT_OPEN
, no efforts are made to put end caps on the extrusion.If closure is
EXT_CLOSED_IN_RZ
, then a torus-like structure is assumed and the last ring is just connected to the first.If ring_markers is not None, it is an list of markers added to each ring. There should be len(rz_points)-1 entries in this list. If rings are added because of closure options, they receive the corresponding XXX_closure_marker. If facet_markers is given, this function returns (points, facets, markers), where markers is is a list containing a marker for each generated facet. Unspecified markers generally default to 0.
If ring_point_indices is given, it must be a list of the same length as rz_points. Each entry in the list may either be None, or a list of point indices. This list must contain the same number of points as the base_shape; it is taken as the indices of pre-existing points that are to be used for the given ring, instead of generating new points.