  Recent advances in text-to-video generation have harnessed the power of
diffusion models to create visually compelling content conditioned on text
prompts. However, they usually encounter high computational costs and often
struggle to produce videos with coherent physical motions. To tackle these
issues, we propose GPT4Motion, a training-free framework that leverages the
planning capability of large language models such as GPT, the physical
simulation strength of Blender, and the excellent image generation ability of
text-to-image diffusion models to enhance the quality of video synthesis.
Specifically, GPT4Motion employs GPT-4 to generate a Blender script based on a
user textual prompt, which commands Blender's built-in physics engine to craft
fundamental scene components that encapsulate coherent physical motions across
frames. Then these components are inputted into Stable Diffusion to generate a
video aligned with the textual prompt. Experimental results on three basic
physical motion scenarios, including rigid object drop and collision, cloth
draping and swinging, and liquid flow, demonstrate that GPT4Motion can generate
high-quality videos efficiently in maintaining motion coherency and entity
consistency. GPT4Motion offers new insights in text-to-video research,
enhancing its quality and broadening its horizon for further explorations.
