PlaceIt3D: Language-Guided Object Placement in Real 3D Scenes

We introduce the novel task of Language-Guided Object Placement in 3D scenes. Our model is given a 3D scene's point cloud, a 3D asset, and a textual prompt broadly describing where the 3D asset should be placed. The task here is to find a valid placement for the 3D asset that respects the prompt.Compared with other language-guided localization tasks in 3D scenes such as grounding,this task has specific challenges: it is ambiguous because it has multiple valid solutions, and it requires reasoning about 3D geometric relationships and free space.We inaugurate this task by proposing a new benchmark and evaluation protocol. We also introduce a new dataset for training 3D LLMs on this task, as well as the first method to serve as a non-trivial baseline. We believe that this challenging task and our new benchmark could become part of the suite of benchmarks used to evaluate and compare generalist 3D LLM models We will release the dataset and the benchmark and baseline code on acceptance.