eradiate.scenes.biosphere.AbstractTree#

class eradiate.scenes.biosphere.AbstractTree(id='abstract_tree', leaf_cloud=None, trunk_height=<Quantity(1.0, 'meter')>, trunk_radius=<Quantity(0.1, 'meter')>, trunk_reflectance=0.5, leaf_cloud_extra_offset=_Nothing.NOTHING)[source]#

Bases: eradiate.scenes.biosphere._tree.Tree

A container class for abstract trees in discrete canopies. Holds a LeafCloud and the parameters characterizing a cylindrical trunk. The entire tree is described in local coordinates and can be placed in the scene using InstancedCanopyElement.

The trunk starts at [0, 0, -0.1] and extends to [0, 0, trunk_height]. The trunk extends below z=0 to avoid intersection issues at the intersection of the trunk and the ground the tree is usually placed on.

The leaf cloud will by default be offset such that its local coordinate origin coincides with the upper end of the trunk. If this is not desired, e.g. the leaf cloud is centered around its coordinate origin and the trunk should not extend into it, the parameter leaf_cloud_extra_offset can be used to shift the leaf cloud in addition to the trunk’s extent.

Parameters

  • id (str, optional, default: "abstract_tree") – User-defined object identifier.

  • leaf_cloud (LeafCloud or dict, optional) – Instanced leaf cloud. Can be specified as a dictionary, which will be interpreted by biosphere_factory. If the latter case, the "type" parameter, if omitted, will implicitly be set to "leaf_cloud".

  • trunk_height (quantity or float, default: 1.0 m) – Trunk height. Unit-enabled field (default: ucc[“length”]).

  • trunk_radius (quantity or float, optional, default: 0.1 m) – Trunk radius. Unit-enabled field (default: ucc[“length”]).

  • trunk_reflectance (Spectrum or dict, optional, default: 0.5) – Reflectance spectrum of the trunk. Must be a reflectance spectrum (dimensionless).

  • leaf_cloud_extra_offset (quantity or array-like, optional, default: [0, 0, 0]) – Additional offset for the leaf cloud. 3-vector. Unit-enabled field (default: ucc[“length”])

Fields

  • id (str or None) – User-defined object identifier.

  • leaf_cloud (LeafCloud or None) – Instanced leaf cloud.

  • trunk_height (quantity) – Trunk height.

  • trunk_radius (quantity) – Trunk radius.

  • trunk_reflectance (Spectrum) – Reflectance spectrum of the trunk.

  • leaf_cloud_extra_offset (quantity) – Additional offset for the leaf cloud.

kernel_bsdfs(ctx)[source]#

Return BSDF plugin specifications.

Parameters

ctx (KernelDictContext) – A context data structure containing parameters relevant for kernel dictionary generation.

Returns

dict – Return a dictionary suitable for merge with a KernelDict containing all the BSDFs attached to the shapes in the abstract tree.

kernel_dict(ctx)#

Return a dictionary suitable for kernel scene configuration.

Parameters

ctx (KernelDictContext) – A context data structure containing parameters relevant for kernel dictionary generation.

Returns

KernelDict – Kernel dictionary which can be loaded as a Mitsuba object.

kernel_shapes(ctx)[source]#

Return shape plugin specifications.

Parameters

ctx (KernelDictContext) – A context data structure containing parameters relevant for kernel dictionary generation.

Returns

dict – A dictionary suitable for merge with a KernelDict containing all the shapes in the abstract tree.