Product structure
Use this feature to manage and manipulate the product structure of 3D scenes, including creating hierarchies, sorting occurrences, and optimizing for performance.
Read time 2 minutesLast updated 9 months ago
API functions:
Product structure is the scene hierarchy of occurrences. It can be seen as a tree where we can go down to the leaf using scene.getChildren and go up to the root using scene.getParent.
We can manipulate this product structure to change order and parenting relations between occurences.
Note
The most complex the product structure is, the less performant will be algorithms to search something in the scene. A complex hierarchy can also have an impact in terms of real time rendering performances. Cleaning and simplifying a complex product structure is an important process to export performant 3D assets.
Code example
Create new occurrences
Let's take an example where we create a new product structure from scratch to match the following tree:
Root|- zz|- |- t|- |- n|- a|- b
def createTestProductStructure(): root = scene.getRoot() zz_occurrence = scene.createOccurrence(name="zz", parent=root) t_occurrence = scene.createOccurrence(name="t", parent=zz_occurrence) n_occurrence = scene.createOccurrence(name="n", parent=zz_occurrence) a_occurrence = scene.createOccurrence(name="a", parent=root) b_occurrence = scene.createOccurrence(name="b", parent=root)
Print the hierarchy tree
We want to be able to print the name of each occurrence and have the same representation in the console than the structure described above.
# Go through the product structure using "depth first" recursive methoddef dfPrintOccurrencesName(offset, occurrence): print(offset + scene.getOccurrenceName(occurrence)) offset = offset + " |- " for child in scene.getChildren(occurrence): dfPrintOccurrencesName(offset, child)
Manipulate the product structure
We want to manipulate the created hierarchy to sort the occurrences based on the alphabetical order of their names.
# Sort a product structure based on occurrences name alphabetical orderdef sortOccurrencesRecursively(occurrence): children = scene.getChildren(occurrence) if not children: return names = core.getProperties(children, "Name") # This built-in method retrieve all the names of an occurrence list children_with_names = zip(children, names) sorted_children_with_names = sorted(children_with_names, key=lambda x: x[1]) sorted_children = [child for child, name in sorted_children_with_names] for child in sorted_children: sortRecursively(child) scene.setParent(child, occurrence)
Output
Root|- a|- b|- zz|- |- n|- |- t