Matterport Capture Training

2D Trim Tool on iPad

February 7, 2026

Managing Exterior Data for Improved Processing, Dollhouse Accuracy and Point Cloud Outputs

Overview

The 2D Trim Tool in the Matterport Capture app for iPad is used to define the intended boundary of a model during capture. It is particularly valuable during exterior scanning where unwanted environmental data can increase processing time and reduce model quality.

Applying trims correctly helps produce cleaner models, improves visual presentation in Dollhouse View and reduces unnecessary geometry being included in certain exported deliverables.

Learning Objectives

After completing this section, you should be able to:

Understand when the 2D Trim Tool should be applied.
Improve model processing efficiency.
Reduce unwanted external geometry.
Predict how trim decisions influence MatterPak outputs.
Understand the limitations of trims in relation to E57 exports.

What Does the 2D Trim Tool Do?

The 2D Trim Tool allows the operator to define areas of captured data that should not be included in the processed model.

Typical uses include:

Removing excess exterior surroundings.
Excluding roads, gardens, neighbouring buildings and sky artefacts.
Controlling unwanted LiDAR returns.
Improving the appearance and navigation of Dollhouse View.

A disciplined trimming workflow often results in:

✓ Faster processing
✓ Cleaner navigation
✓ Reduced visual clutter
✓ Improved presentation quality

Windows, Mirrors and Trims – Impact on Point Cloud Deliverables

E57 Export

For E57 point cloud exports, window, mirror and trim markings do not alter the exported point cloud.

This means:

All captured point data remains available.
No points are removed because of trim, mirror or window markings.
The E57 export reflects captured scan data rather than visual processing decisions.

MatterPak (.XYZ) Export

MatterPak point cloud generation behaves differently.

When creating the .XYZ point cloud:

Points located behind window markings are removed.
Points located behind mirror markings are removed.
Points located behind trim boundaries are removed.
No replacement points are generated on glass or mirror surfaces.

Practical Result

If exterior scenery was visible through glazing before marking:

That exterior information will not appear in the MatterPak point cloud.
The glazing itself will not generate point data.
Open views beyond windows will effectively become empty space within the exported dataset.

CaptureTrain Recommended Workflow

Complete scanning before applying trims.
Review Dollhouse and Floor Plan views.
Add trims conservatively.
Mark windows and mirrors only where necessary.
Consider final deliverables before processing:
- Virtual Tour only
- MatterPak
- E57
- BIM/CAD workflows
- Survey deliverables

Training Note

Incorrect trimming rarely affects the visual tour dramatically but may significantly influence downstream workflows such as CAD extraction, modelling and point cloud usage.

Always evaluate trims in the context of the intended deliverable.