  Recent progress in text-to-3D creation has been propelled by integrating the
potent prior of Diffusion Models from text-to-image generation into the 3D
domain. Nevertheless, generating 3D scenes characterized by multiple instances
and intricate arrangements remains challenging. In this study, we present
DreamScape, a method for creating highly consistent 3D scenes solely from
textual descriptions, leveraging the strong 3D representation capabilities of
Gaussian Splatting and the complex arrangement abilities of large language
models (LLMs). Our approach involves a 3D Gaussian Guide ($3{DG^2}$) for scene
representation, consisting of semantic primitives (objects) and their spatial
transformations and relationships derived directly from text prompts using
LLMs. This compositional representation allows for local-to-global optimization
of the entire scene. A progressive scale control is tailored during local
object generation, ensuring that objects of different sizes and densities adapt
to the scene, which addresses training instability issue arising from simple
blending in the subsequent global optimization stage. To mitigate potential
biases of LLM priors, we model collision relationships between objects at the
global level, enhancing physical correctness and overall realism. Additionally,
to generate pervasive objects like rain and snow distributed extensively across
the scene, we introduce a sparse initialization and densification strategy.
Experiments demonstrate that DreamScape offers high usability and
controllability, enabling the generation of high-fidelity 3D scenes from only
text prompts and achieving state-of-the-art performance compared to other
methods.
