# Cuboid Grouping

Cuboid Grouping allows users to link multiple cuboids that move together in the real world - maintaining their relative positions throughout a sequence. This is particularly useful when tracking objects that are physically connected or consistently aligned. The grouping helps improve annotation accuracy, ensures spatial consistency, and reduces the need for manual frame-by-frame adjustments. It’s a good and lean feature, enhancing both annotation quality and workflow efficiency without adding complexity.

{% hint style="success" %} <img src="/files/mXHEiGg35kYjwl0I4r5p" alt="" data-size="line"> Useful when tracking objects that are physically connected or consistently aligned.
{% endhint %}

![](/files/ebb938bdbe79ebca671989bb0291625299f44c8b)

***

## Use Case

* Agri-Tech – Tractor with a Towed Implement\
  Grouping ensures the implement maintains a fixed offset behind the tractor across the sequence, saving time and reducing annotation drift.
* Autonomous Driving – Cabin and a Trailer\
  Helps track multi-part vehicles moving together while preserving their orientation and spacing.

## Benefits

* Good: Maintains consistent spatial relationships between grouped cuboids, improving annotation accuracy across frames.
* Lean: Reduces manual alignment work, especially in sequences where linked objects appear across long spans.
* Flexible: Grouping can be applied and ungrouped selectively over any frame range, offering precise control.

## Steps to Use Cuboid Grouping

{% stepper %}
{% step %}

#### Multi-select cuboids

Select the cuboids to be grouped by holding down the Ctrl key and multi-selecting each cuboid.
{% endstep %}

{% step %}

#### Choose the lead cuboid

Hover over the cuboid that should lead the group, then right-click (contextual click) and choose “Group” from the context menu.

* The grouping feature will confirm the range and prevent selecting a range where both annotations are not present.
  {% endstep %}

{% step %}

#### View orthogonal

Click on an individual cuboid within the group to view the orthogonal view.

* These orthogonal views are read-only as long as the cuboid is grouped.
  {% endstep %}

{% step %}

#### Ungroup

Navigate to the frame where the grouping should end. Right-click the lead cuboid and select “Ungroup”.

* The ungroup will confirm the range the ungrouping action should be applied to.
  {% endstep %}
  {% endstepper %}

{% hint style="info" %}
Tip: Use grouping to avoid drift and rework when dealing with attached or coordinated objects that stay aligned throughout a sequence.
{% endhint %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.imerit.net/3d-multi-sensor-fusion/labeling/3d-multi-sensor-fusion-labeling-editor/key-features/cuboid-grouping.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.