When working on molecular modeling, precise measurements of distances, angles, and dihedrals are crucial to analyzing and understanding molecular structures. However, documenting and managing these measurements while ensuring clarity can become a challenge. Fortunately, SAMSON’s Measure editor offers a way to simplify this by using measurement labels.
Measurement labels serve as powerful tools that not only display molecular properties, such as distances and angles, but also ensure these measurements are accessible and modifiable for further analysis. This blog post will guide you through how to leverage measurement labels effectively within SAMSON’s environment to enhance your molecular design workflow.
What Are Measurement Labels?
Measurement labels are annotations added to your molecular model to record distances, angles, bond lengths, or torsions. These labels remain visible in your document and can be saved for future reference. If you don’t save a measurement label, it acts as a temporary annotation that disappears once you perform another measurement.
Here’s how to create and save them using the Measure editor:
- To measure a distance, click on two atoms.
- To measure an angle, click on three atoms.
- To measure a torsion (dihedral), click on four atoms.
Once the desired measurement appears, simply press the Enter key to save it as a label within the document. Saved labels are stored permanently and can contain more detailed information in the Inspector panel.

Updating and Customizing Measurement Labels
One of the practical features of measurement labels in SAMSON is their adaptability. Labels automatically update as the positions or charges of associated atoms change, so you don’t need to repeat the measurement process manually. This dynamic updating is especially useful when using Move editors or during interactive minimization.
To customize your measurement labels, head to the Inspector, where you can adjust the font, color, and offset of the labels for a clearer visualization. For angle and torsion measurements, you can further modify the colors of distance lines, angle planes, and text annotations.
Here are some helpful customization features:
- To reset a label’s line color to its default, double-click on the associated text in the Inspector.
- To reset text color, click the X button next to the Text color in the Inspector.

Managing Label Preferences
If you frequently use labels, you can streamline their appearance through the global settings found in Preferences (Preferences > Rendering > Labels). There, you can specify default fonts for labels, adjust the number of decimal places shown for distances and angles, and establish a consistent visual style for your projects. This ensures all your measurements follow the same format, reducing inconsistencies in your reports.

Why Use Measurement Labels?
Measurement labels are invaluable for keeping track of your molecular insights while ensuring clarity in your designs. Their ability to update dynamically and provide customizable options make them a great asset for both beginners and seasoned molecular modelers.
To learn more about using the Measure editor and measurement labels in SAMSON, visit the official documentation page here: https://documentation.samson-connect.net/users/latest/measuring/.
SAMSON and all SAMSON Extensions are free for non-commercial use. Download SAMSON at https://www.samson-connect.net.
