> ## Documentation Index
> Fetch the complete documentation index at: https://mintlify.com/QwenLM/Qwen3-VL/llms.txt
> Use this file to discover all available pages before exploring further.

# 3D Grounding

> Accurate 3D bounding boxes for indoor and outdoor objects

# 3D Grounding

Qwen3-VL introduces 3D grounding capabilities that provide accurate 3D bounding boxes for both indoor and outdoor objects. This advanced spatial perception enables applications in robotics, autonomous systems, AR/VR, and embodied AI.

## Capabilities

Qwen3-VL's 3D grounding extends object localization into three dimensions:

* **3D Bounding Boxes**: Full volumetric object bounds
* **Indoor Scenes**: Furniture, appliances, room elements
* **Outdoor Scenes**: Vehicles, buildings, street furniture
* **Depth Estimation**: Infer object distance and depth
* **Spatial Relationships**: Understand 3D positioning between objects

## How It Works

### 3D Coordinate System

3D bounding boxes are represented with:

* **Position**: X, Y, Z coordinates in 3D space
* **Dimensions**: Width, height, depth
* **Orientation**: Rotation angles (pitch, yaw, roll)

This enables full spatial understanding of objects in the scene.

### Scene Understanding

The model analyzes:

* Perspective and vanishing points
* Occlusion and depth ordering
* Relative object sizes
* Scene geometry and structure

## Use Cases

### Robotics & Embodied AI

* **Navigation**: Help robots understand 3D space for path planning
* **Manipulation**: Guide robotic arms to grasp and move objects
* **Scene Understanding**: Build 3D world models for robot operation

### Autonomous Systems

* **Self-driving Vehicles**: Detect and track 3D positions of vehicles, pedestrians
* **Drones**: Navigate complex 3D environments
* **Warehouse Automation**: Locate and retrieve items in 3D space

### AR/VR Applications

* **Object Placement**: Position virtual objects realistically in real scenes
* **Scene Reconstruction**: Build 3D models from 2D images
* **Spatial Computing**: Enable mixed reality interactions

### Architecture & Design

* **Space Planning**: Analyze room dimensions and furniture placement
* **Construction**: Measure and model building elements
* **Interior Design**: Visualize furniture in 3D space

## Try It Out

Explore 3D grounding with our interactive cookbook:

> **[3D Grounding Cookbook](https://github.com/QwenLM/Qwen3-VL/blob/main/cookbooks/3d_grounding.ipynb)**
>
> Provide accurate 3D bounding boxes for both indoor and outdoor objects.

[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/QwenLM/Qwen3-VL/blob/main/cookbooks/3d_grounding.ipynb)

## Key Features

* **Advanced Spatial Perception**: Judge object positions, viewpoints, and occlusions
* **Indoor & Outdoor**: Works in diverse environments
* **Multi-object Tracking**: Track multiple objects in 3D space
* **Depth Reasoning**: Infer relative distances and depths

## Technical Highlights

Qwen3-VL achieves 3D grounding through:

* **Monocular Depth Estimation**: Infer depth from single images
* **Perspective Understanding**: Analyze camera angle and field of view
* **Geometric Reasoning**: Apply spatial constraints and relationships
* **Scene Context**: Use surrounding objects to inform 3D understanding

## Related Capabilities

* [2D Grounding](https://mintlify.com/QwenLM/Qwen3-VL/capabilities/grounding-2d.md) - 2D object localization
* [Spatial Understanding](https://mintlify.com/QwenLM/Qwen3-VL/capabilities/spatial-understanding.md) - Spatial reasoning and relationships
* [Omni Recognition](https://mintlify.com/QwenLM/Qwen3-VL/capabilities/omni-recognition.md) - Identify objects in 3D space


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