GraphDreamer: Compositional 3D Scene Synthesis from Scene Graphs
Authors: name: Gege Gao, name: Weiyang Liu, name: Anpei Chen, name: Andreas Geiger, name: Bernhard Schölkopf

As pretrained text-to-image diffusion models become increasingly powerful,
recent efforts have been made to distill knowledge from these text-to-image
pretrained models for optimizing a text-guided 3D model. Most of the existing
methods generate a holistic 3D model from a plain text input. This can be
problematic when the text describes a complex scene with multiple objects,
because the vectorized text embeddings are inherently unable to capture a
complex description with multiple entities and relationships. Holistic 3D
modeling of the entire scene further prevents accurate grounding of text
entities and concepts. To address this limitation, we propose GraphDreamer, a
novel framework to generate compositional 3D scenes from scene graphs, where
objects are represented as nodes and their interactions as edges. By exploiting
node and edge information in scene graphs, our method makes better use of the
pretrained text-to-image diffusion model and is able to fully disentangle
different objects without image-level supervision. To facilitate modeling of
object-wise relationships, we use signed distance fields as representation and
impose a constraint to avoid inter-penetration of objects. To avoid manual
scene graph creation, we design a text prompt for ChatGPT to generate scene
graphs based on text inputs. We conduct both qualitative and quantitative
experiments to validate the effectiveness of GraphDreamer in generating
high-fidelity compositional 3D scenes with disentangled object entities.