Scene-level 3D generation represents a critical frontier in multimedia and
computer graphics, yet existing approaches either suffer from limited object
categories or lack editing flexibility for interactive applications. In this
paper, we present HiScene, a novel hierarchical framework that bridges the gap
between 2D image generation and 3D object generation and delivers high-fidelity
scenes with compositional identities and aesthetic scene content. Our key
insight is treating scenes as hierarchical “objects” under isometric views,
where a room functions as a complex object that can be further decomposed into
manipulatable items. This hierarchical approach enables us to generate 3D
content that aligns with 2D representations while maintaining compositional
structure. To ensure completeness and spatial alignment of each decomposed
instance, we develop a video-diffusion-based amodal completion technique that
effectively handles occlusions and shadows between objects, and introduce shape
prior injection to ensure spatial coherence within the scene. Experimental
results demonstrate that our method produces more natural object arrangements
and complete object instances suitable for interactive applications, while
maintaining physical plausibility and alignment with user inputs.
