trimesh.path.traversal

Classes:

PathSample(points)

Functions:

closed_paths(entities, vertices)

Paths are lists of entity indices.

discretize_path(entities, vertices, path[, …])

Turn a list of entity indices into a path of connected points.

is_ccw(points)

Check if connected 2D points are counterclockwise.

resample_path(points[, count, step, step_round])

Given a path along (n,d) points, resample them such that the distance traversed along the path is constant in between each of the resampled points.

split(path)

Split a Path2D into multiple Path2D objects where each one has exactly one root curve.

vertex_graph(entities)

Given a set of entity objects generate a networkx.Graph that represents their vertex nodes.

vertex_to_entity_path(vertex_path, graph, …)

Convert a path of vertex indices to a path of entity indices.
class trimesh.path.traversal.PathSample(points)

Bases: object

Methods:

sample(distances)

truncate(distance)

Return a truncated version of the path.
sample(distances)
truncate(distance)

Return a truncated version of the path. Only one vertex (at the endpoint) will be added.

trimesh.path.traversal.closed_paths(entities, vertices)

Paths are lists of entity indices. We first generate vertex paths using graph cycle algorithms, and then convert them to entity paths.

This will also change the ordering of entity.points in place so a path may be traversed without having to reverse the entity.

Parameters

  • entities ((n,) entity objects) – Entity objects

  • vertices ((m, dimension) float) – Vertex points in space

Returns

entity_paths – Ordered traversals of entities

Return type

sequence of (n,) int

trimesh.path.traversal.discretize_path(entities, vertices, path, scale=1.0)

Turn a list of entity indices into a path of connected points.

Parameters

  • entities ((j,) entity objects) – Objects like ‘Line’, ‘Arc’, etc.

  • vertices ((n, dimension) float) – Vertex points in space.

  • path ((m,) int) – Indexes of entities

  • scale (float) – Overall scale of drawing used for numeric tolerances in certain cases

Returns

discrete – Connected points in space that lie on the path and can be connected with line segments.

Return type

(p, dimension) float

trimesh.path.traversal.resample_path(points, count=None, step=None, step_round=True)

Given a path along (n,d) points, resample them such that the distance traversed along the path is constant in between each of the resampled points. Note that this can produce clipping at corners, as the original vertices are NOT guaranteed to be in the new, resampled path.

ONLY ONE of count or step can be specified Result can be uniformly distributed (np.linspace) by specifying count Result can have a specific distance (np.arange) by specifying step

Parameters

  • points ((n, d) float) – Points in space

  • count (int,) – Number of points to sample evenly (aka np.linspace)

  • step (float) – Distance each step should take along the path (aka np.arange)

Returns

resampled – Points on the path

Return type

(j,d) float

trimesh.path.traversal.split(path)

Split a Path2D into multiple Path2D objects where each one has exactly one root curve.

Parameters

path (trimesh.path.Path2D) – Input geometry

Returns

split – Original geometry as separate paths

Return type

list of trimesh.path.Path2D

trimesh.path.traversal.vertex_graph(entities)

Given a set of entity objects generate a networkx.Graph that represents their vertex nodes.

Parameters

entities (list) – Objects with ‘closed’ and ‘nodes’ attributes

Returns

  • graph (networkx.Graph) – Graph where node indexes represent vertices

  • closed ((n,) int) – Indexes of entities which are ‘closed’

trimesh.path.traversal.vertex_to_entity_path(vertex_path, graph, entities, vertices=None)

Convert a path of vertex indices to a path of entity indices.

Parameters

  • vertex_path ((n,) int) – Ordered list of vertex indices representing a path

  • graph (nx.Graph) – Vertex connectivity

  • entities ((m,) list) – Entity objects

  • vertices ((p, dimension) float) – Vertex points in space

Returns

entity_path – Entity indices which make up vertex_path

Return type

(q,) int