accessing the level graph, the level graph comprising a first node, a second node, a third node, and a target node, wherein:

the second node, third node, and target node are descendants of the first node,

the target node or an ancestor of the target node is a direct descendant of both the second node and the third node, and

the first node comprises a first scene description data, the second node comprises a first variation data, the third node comprises a second variation data, and the target node comprises a third variation data;

receiving a selection of the target node for computation;

determining ancestors of the target node, wherein the ancestors of the target node comprises the first node, the second node, and the third node;

determining a linearization of the ancestors of the target node, the linearization comprising an order of the ancestors of the target node;

initializing a scene description using the first scene description data of the first node;

applying the variation data of the second node and the third node, based on the order determined by the linearization, to the scene description to produce an updated scene description;

applying the third variation of the target node to the updated scene description to produce a final scene description; and

rendering an image based on the final scene description.