> For the complete documentation index, see [llms.txt](https://docs.m-xr.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.m-xr.com/marso-measure/resources/photogrammetry-tips/reality-capture/marso-measure-and-reality-scan-cross-pol-or-sprayed-workflow.md).

# Marso Measure & Reality Scan - Cross-Pol or Sprayed workflow

Follow this page if you would like to use cross-polarisation or scanning spray.

### Capture

1. Initially capture your dataset following Marso Measure's [capture guidelines](/marso-measure/getting-started/capture.md).

{% hint style="success" %}
Shoot in RAW

Get a good equal coverage of cameras, making sure to capture the top and bottom of the asset

Keep your camera settings consistent throughout your scan
{% endhint %}

2. Then spray your object in scanning spray, and capture the object again. This time you can capture in JPG, making sure the capture is evenly exposed. You do not need to follow the Marso Measure capture technique in this instance, it can simply be how you would usually get a good photogrammetry scan.

{% hint style="danger" %}
The subject should not move between captures and the same markers should be visible - do not spray the markers.
{% endhint %}

***

### Develop

1. Follow the [Develop step](/marso-measure/getting-started/create-job.md#develop-configuration) in Marso Measure to develop the RAWs for Reality Scan, if you have a shiny object, more brightening may be required when following this step.

***

### Processing in Reality Scan

#### Alignment

1. Bring both the sprayed images and the Marso Measure images to RS, detect markers with a minimum of 10 measurements and align.

<div align="left"><figure><img src="https://content.gitbook.com/content/dSWZvUSEhiy6J2XcG20t/blobs/UugyHAesR8TIci9tWXuj/Screenshot%202025-08-19%20at%2011.03.59.png" alt="" width="375"><figcaption></figcaption></figure></div>

2. Both datasets should align together at this stage.
3. Define a known distance between 2 control points. These could be 2 markers.
4. Remove any control points with poor measurement accuracy, or remove all control points except those required for scaling if you feel you will get a nice alignment second time round based on your first effort.
5. Align again.&#x20;

#### Meshing and Preparing

1. Set the recon region for meshing.
2. Now only select the Marso Measure images and not the sprayed ones.

{% hint style="info" %}
To complete step 2, head to the console and use `-selectImage g/photo/`
{% endhint %}

3. Disable those images for meshing. If you do not have scanning spray and are only using cross-polarisation, skip this step and use all images for meshing.
4. Set the reconstruction region for meshing and mesh in normal detail.
5. Clean up mesh and make mask mesh if necessary.
6. Simplify and smooth mesh.
7. Unwrap mesh to a single 8k texture.

#### Export

{% hint style="warning" %}
Select only Marso Measure cameras again, using `-selectImage g/photo/`
{% endhint %}

1. Export the alembic.
2. Make sure only Marso Measure cameras are used again, then export your ST maps.


---

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