One of the recurring challenges for molecular modelers is the accurate and quick assessment of distances, bond angles, and dihedrals in molecular structures. If this is something you encounter in your workflow, SAMSON’s Measure editor offers an efficient solution to simplify this essential task.
The Measure editor allows you to precisely measure distances, bond lengths, angles, and torsions directly in the viewport, eliminating the need for tedious calculations or external tools. Here’s how it works and why it can help you work more smartly when modeling molecular structures:
Flexible Measurements at Your Fingertips
With the Measure editor, you can:
- Click on a bond to determine and display its length.
- Select two atoms to instantly view the distance between them.
- Choose three atoms to calculate the bond angle they form.
- Pick four atoms to visualize the torsion angle.
Whether you’re analyzing a newly designed molecule or preparing a structure for further simulation, having these insights at your fingertips can be invaluable.

Temporary and Saved Measurements
The Measure editor supports both temporary and saved measurements. A temporary measurement remains visible in the viewport until you begin another measurement, making it great for quick checks. For measurements you’d like to keep, you can save them as labels within your document by simply pressing Enter. Once saved, labels persist with your project and are also stored when saving the document in SAMSON’s .sam or .samx file formats.
Dynamic Updates for a Smooth Workflow
Worried about having to re-measure every time you adjust your structure? Saved measurement labels dynamically update in sync with structural changes. Whether you’re fine-tuning positions using SAMSON’s Move editors or using interactive minimization, your measurements will always reflect the current state of your structure.

Customizing to Suit Your Needs
Measurement labels can reflect more than just numerical parameters: enhance clarity by adjusting their font, color, or visibility through SAMSON’s Inspector. You can even apply custom colors to measurement lines and angles for quick recognition, as shown below:

Want to reset your adjustments? Simply double-click on the text or use the clear button in the Inspector.
Conclusion
By integrating accurate and customizable measurement tools directly into the molecular modeling workflow, SAMSON’s Measure editor empowers researchers to focus on achieving insights rather than managing logistics. The interactivity, ease of use, and advanced customization options make it a valuable tool for anyone working with molecular structures.
To explore the full capabilities of the Measure editor, visit the official documentation page.
SAMSON and all SAMSON Extensions are free for non-commercial use. You can download SAMSON at https://www.samson-connect.net.
