# Photogrammetry

Once you have the photogrammetry images generated by Marso Measure, you can complete your normal Photogrammetry Workflow.

For specific tips depending on your photogrammetry software of choice, see [Photogrammetry Tips](https://docs.m-xr.com/marso-measure/resources/photogrammetry-tips).

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## Photogrammetry Checklist

#### Use the images generated by Marso Measure

Images with names *photogrammetry\_xxx* must be used. You can find these by pressing the `Images` button when the job is selected.

{% hint style="info" %}
At this time, you **cannot** use an external software like Lightroom to do this.
{% endhint %}

#### Ensure most cameras are solved accurately

Poorly solved cameras can lead to artifacts in the material measurement later on. We recommend attempting to re-align any bad camera solves. Cameras that cannot be aligned should be removed from the scene or disabled.

#### Include any stands or supports in your bounding box

Any geometry that might obstruct a camera's view of the subject should not be removed, but exported separately as a [Mesh Mask](https://docs.m-xr.com/marso-measure/getting-started/photogrammetry/mask-mesh-and-manual-uv-unwrap)

#### Scale the Solved Scene

It is essential that the scene is scaled. The recommended approach is to place two markers at a known distance apart in the scene, and once solve apply the distance constraint.

{% hint style="info" %}
You can also re-scale with Blender by following the instructions [here](https://docs.m-xr.com/marso-measure/resources/re-scaling-an-alembic-with-blender).
{% endhint %}

#### UV Unwrap the subject

A UV Unwrap is required for Marso Measure to export textures. This can be done automatically by the photogrammetry software by running the texturing process, or [Manually](https://docs.m-xr.com/marso-measure/getting-started/photogrammetry/mask-mesh-and-manual-uv-unwrap) if you prefer.

{% hint style="info" %}
For optimal UVs we recommend generating the texture at the same resolution or lower resolution than the textures you wish to output from Marso Measure. 

A UV Unwrap at higher resolution than the final textures may cause artifacts.
{% endhint %}

#### Use the Export Configuration

For Reality capture we provide Export Configurations that can be loaded to ensure the export settings are correct:

* [Reality Capture - Alembic Export](https://f005.backblazeb2.com/file/maestro-external-releases/confluence_files/reality_capture_1.4_alembic_export_settings.xml)
* [Reality Capture - ST Map](https://f005.backblazeb2.com/file/maestro-external-releases/confluence_files/reality_capture_1.4_ST_map_export_settings.xml)

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{% hint style="warning" %}
A very high number of polygons in the mesh may cause Marso Measure to exceed the available VRAM on your system. If this occurs, simplify the mesh and reattempt the process. 

Marso Measure can produce highly detailed normals, even on medium to low poly meshes.
{% endhint %}

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