---
title: Classify with 2D polygons
slug: task-view-guide/classify-with-2d-polygons
docTags: 
createdAt: 2026-02-18T12:30:29.688Z
---

:::hint{type="warning"}
This feature can only be used when you have a task with 2D polygons **connected** to 3D classifications.
:::

After annotating 2D polygons, go to the 3D view and activate the tool. It will automatically classify all points in the point cloud that match each polygon.

## How to use the tool

::::WorkflowBlock{src="https://api.archbee.com/api/optimize/wLEz_RbWP6nIMpY-prjlm/4AMyFsy7uiVVFg2IZYqfR-20260302-101923.gif" size="100" width="799" height="544" position="center" caption="The ground 2D polygon is used to classify the points in 3D"}
:::WorkflowBlockItem
 Create 2D polygon annotations in a camera view
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:::WorkflowBlockItem
Switch to the 3D view
:::

:::WorkflowBlockItem
Click **Project polygons to 3D** in the 3D toolbar
:::
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::Image[]{src="https://api.archbee.com/api/optimize/wLEz_RbWP6nIMpY-prjlm/Q7522V32K43LoBdhUCAtL-20260218-131741.png" size="54" width="420" height="178" position="center" caption="Classify with 2D polygon tool" showCaption="true"}

![](https://api.archbee.com/api/optimize/wLEz_RbWP6nIMpY-prjlm/4AMyFsy7uiVVFg2IZYqfR-20260302-101923.gif "The ground 2D polygon is used to classify the points in 3D")

## When to use the tool

Use this tool when you have drawn 2D polygon annotations in a camera view and want to classify the corresponding points in the 3D point cloud. Instead of manually painting each region in 3D, you can project all polygons from the current camera view at once, and each polygon's points will be classified with the corresponding classification ID.

This is especially useful for fusion annotation tasks where you need to annotate the same objects in both 2D and 3D. Drawing polygons in 2D is often faster and more precise, and this tool lets you leverage that work to bootstrap the 3D segmentation.