GPT4Point: A Unified Framework for Point-Language Understanding and
  Generation
Zhangyang Qi Ye Fang Zeyi Sun Xiaoyang Wu Tong Wu Jiaqi Wang Dahua Lin Hengshuang Zhao
Multimodal Large Language Models (MLLMs) have excelled in 2D image-text
comprehension and image generation, but their understanding of the 3D world is
notably deficient, limiting progress in 3D language understanding and
generation. To solve this problem, we introduce GPT4Point, an innovative
groundbreaking point-language multimodal model designed specifically for
unified 3D object understanding and generation within the MLLM framework.
GPT4Point as a powerful 3D MLLM seamlessly can execute a variety of point-text
reference tasks such as point-cloud captioning and Q&A. Additionally, GPT4Point
is equipped with advanced capabilities for controllable 3D generation, it can
get high-quality results through a low-quality point-text feature maintaining
the geometric shapes and colors. To support the expansive needs of 3D
object-text pairs, we develop Pyramid-XL, a point-language dataset annotation
engine. It constructs a large-scale database over 1M objects of varied text
granularity levels from the Objaverse-XL dataset, essential for training
GPT4Point. A comprehensive benchmark has been proposed to evaluate 3D
point-language understanding capabilities. In extensive evaluations, GPT4Point
has demonstrated superior performance in understanding and generation.