eradiate.kernel.KernelDictTemplate

class eradiate.kernel.KernelDictTemplate(data=NOTHING)

Bases: UserDict

A dict-like structure which defines the structure of an instantiable Mitsuba scene dictionary.

Entries are indexed by dot-separated paths which can then be expanded to a nested dictionary using the render() method.

Each entry can be either a hard-coded value which can be directly interpreted by the mitsuba.load_dict() function, or an InitParameter object which must be rendered before the template can be instantiated.

Notes

If a nested mapping is used for initialization or assignment, it is automatically flattened.

clear() → None.  Remove all items from D.

get(k[, d]) → D[k] if k in D, else d.  d defaults to None.

items() → a set-like object providing a view on D's items

keys() → a set-like object providing a view on D's keys

pop(k[, d]) → v, remove specified key and return the corresponding value.

If key is not found, d is returned if given, otherwise KeyError is raised.

popitem() → (k, v), remove and return some (key, value) pair

as a 2-tuple; but raise KeyError if D is empty.

render(ctx, nested=True, drop=True)

Render the template as a nested dictionary using a parameter map to fill in empty fields.

Parameters:

• ctx (KernelContext) – A kernel dictionary context.

• nested (bool, optional) – If True, the returned dictionary will be nested and suitable for instantiation by Mitsuba; otherwise, the returned dictionary will be flat.

• drop (bool, optional) – If True, drop unused parameters. Parameters may be unused either because they were filtered out by the flags or because context information implied it.

Returns:

dict

setdefault(k[, d]) → D.get(k,d), also set D[k]=d if k not in D

update([E, ]**F) → None.  Update D from mapping/iterable E and F.

If E present and has a .keys() method, does: for k in E: D[k] = E[k] If E present and lacks .keys() method, does: for (k, v) in E: D[k] = v In either case, this is followed by: for k, v in F.items(): D[k] = v

values() → an object providing a view on D's values