Package meshpy :: Module geometry
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Module geometry

source code

Classes [hide private]
  GeometryBuilder
  Marker
Functions [hide private]
 
bounding_box(points) source code
 
is_multi_polygon(facets) source code
 
offset_point_indices(facets, offset) source code
 
make_box(a, b, subdivisions=None)
:param subdivisions: is a tuple of integers specifying the number of subdivisions along each axis.
source code
 
make_circle(r, center=(0, 0), subdivisions=40, marker=100) source code
 
make_ball(r, subdivisions=10) source code
 
make_cylinder(radius, height, radial_subdivisions=10, height_subdivisions=1) source code
 
_is_same_float(a, b, threshold=1e-10) source code
 
generate_extrusion(rz_points, base_shape, closure=0, point_idx_offset=0, ring_point_indices=None, ring_markers=None, rz_closure_marker=0)
Extrude a given connected base_shape (a list of (x,y) points) along the z axis.
source code
 
generate_surface_of_revolution(rz_points, closure=0, radial_subdiv=16, point_idx_offset=0, ring_point_indices=None, ring_markers=None, rz_closure_marker=0) source code
Variables [hide private]
  EXT_OPEN = 0
  EXT_CLOSED_IN_RZ = 1
  __package__ = 'meshpy'
Function Details [hide private]

generate_extrusion(rz_points, base_shape, closure=0, point_idx_offset=0, ring_point_indices=None, ring_markers=None, rz_closure_marker=0)

source code 

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 MeshInfo.set_facets_ex to add the extrusion to a MeshInfo 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.