scene_synthesizer.assets.BoxMeshAsset

class scene_synthesizer.assets.BoxMeshAsset(*args, **kwargs)

A triangular mesh in the shape of a box.

Parameters:

extents (list[float]) – 3D extents of the box.
transform (np.ndarray, optional) – 4x4 homogeneous transformation matrix for box center. Defaults to None.

as_trimesh_scene(namespace='object', use_collision_geometry=True)

compute_stable_poses(convexify=False, center_mass=None, sigma=0.0, n_samples=1, threshold=0.0, tolerance_zero_extent=1e-6, use_collision_geometry=True)

Wrapper for trimesh.poses.compute_stable_poses function.

Parameters:

convexify (bool, optional) – Whether to use the convex hull of the object.
center_mass ((3,) float, optional) – The object center of mass. If None, this method assumes uniform density and watertightness and computes a center of mass explicitly. Defaults to None.
sigma (float, optional) – The covariance for the multivariate gaussian used to sample center of mass locations. Defaults to 0.0.
n_samples (int, optional) – The number of samples of the center of mass location. Defaults to 1.
threshold (float, optional) – The probability value at which to threshold returned stable poses. Defaults to 0.0.
tolerance_zero_extent (float, optional) – The threshold for considering a dimension to have zero length. In this case, trimesh.poses.compute_stable_poses gets caught in an infinite loop. We avoid this by specifying the stable poses to be along zero-length dimensions. Defaults to 1e-6.
use_collision_geometry (bool, optional) – Whether to use the collision geometry or visual geometry to calculate stable poses. Defaults to True.

Returns:

The homogeneous matrices that transform the object to rest in a stable pose. probs ((n,) float): Probability in (0, 1) for each pose

Return type:

transforms ((n, 4, 4) float)

get_bounds(query=None, frame=None, use_collision_geometry=None)

Return bounds of asset defined through nodes selected by query.

Parameters:

query (list[str] or str) – A list, string, or regular expression referring to a subset of all geometry of this asset. None means entire asset. Defaults to None.
frame (str, optional) – The reference frame to use. None means asset’s base frame is used. Defaults to None.
use_collision_geometry (bool, optional) – Whether to use collision geometry, visual geometry or both (if None). Defaults to None.

Returns:

A 2x3 matrix of minimum and maximum coordinates for each dimension.

Return type:

np.ndarray

get_center_mass(query=None, frame=None, use_collision_geometry=None)

Return center of mass for subscene defined through nodes selected by query.

Parameters:

query (list[str] or str) – A list, string, or regular expression referring to a subset of all geometry of this asset. None means entire asset. Defaults to None.
frame (str, optional) – The reference frame to use. None means asset’s base frame is used. Defaults to None.
use_collision_geometry (bool, optional) – Whether to use collision geometry, visual geometry or both (if None). Defaults to None.

Returns:

A 3-vector describing the center of mass of the queried subscene.

Return type:

np.ndarray

get_centroid(query=None, frame=None, use_collision_geometry=None)

Return centroid for asset defined through nodes selected by query.

Parameters:

query (list[str] or str) – A list, string, or regular expression referring to a subset of all geometry of this asset. None means entire asset. Defaults to None.
frame (str, optional) – The reference frame to use. None means asset’s base frame is used. Defaults to None.
use_collision_geometry (bool, optional) – Whether to use collision geometry, visual geometry or both (if None). Defaults to None.

Returns:

A 3-vector describing the centroid of the queried subscene.

Return type:

np.ndarray

get_extents(query=None, frame=None, use_collision_geometry=None)

Return extents of asset defined through nodes selected by query.

Parameters:

query (list[str] or str) – A list, string, or regular expression referring to a subset of all geometry of this asset. None means entire asset. Defaults to None.
frame (str, optional) – The reference frame to use. None means asset’s base frame is used. Defaults to None.
use_collision_geometry (bool, optional) – Whether to use collision geometry, visual geometry or both (if None). Defaults to None.

Returns:

A 3-vector describing the extents of each dimension.

Return type:

np.ndarray

get_reference_frame(xyz, query=None, frame=None, use_collision_geometry=None)

Return reference frame for subscene defined through nodes selected by query.

Parameters:

xyz (tuple[str]) – A 3-tuple/list of [‘top’, ‘center’, ‘bottom’, ‘com’, ‘centroid’]
query (list[str] or str) – A list, string, or regular expression referring to a subset of all geometry of this asset. None means entire asset. Defaults to None.
frame (str, optional) – The reference frame to use. None means scene’s base frame is used. Defaults to None.
use_collision_geometry (bool, optional) – Whether to use collision geometry, visual geometry or both (if None). Defaults to None.

Raises:

ValueError – Unknown reference string.

Returns:

A 4x4 homogenous matrix.

Return type:

np.ndarray

mesh(use_collision_geometry=False)

Return a trimesh.Trimesh object of the asset.

Parameters:: use_collision_geometry (bool, optional) – Whether to use the collision or visual geometry or both. Defaults to False.
Returns:: A trimesh mesh.
Return type:: trimesh.Trimesh

sample_stable_pose(seed=None, **kwargs)

Return a stable pose according to their likelihood.

Returns:: homogeneous 4x4 matrix seed (int, numpy.random._generator.Generator, optional): A seed or random number generator. Defaults to None which creates a new default random number generator.
Return type:: np.ndarray

scene(obj_id='object', **kwargs)

Return a scene consisting of only this asset.

Parameters:

obj_id (str, optional) – Name of object in scene. Defaults to ‘object’.
**kwargs – Additional keyword arguments that will be piped to the add_object method.

Returns:

A scene

Return type:

scene.Scene

show(use_collision_geometry=False, layers=None)

Display the asset via the trimesh scene viewer.

Parameters:

use_collision_geometry (bool, optional) – Which geometry to show: visual or collision geometry. Defaults to False.
layers (list[str], optional) – Filter to show only certain layers, e.g. ‘visual’ or ‘collision’. Defaults to None, showing everything.