In molecular modeling, achieving precise control over the manipulation of structures is an essential task. Whether you are aligning molecules, adjusting fragments, or rotating structures, having the right tools at your disposal can make a significant difference. SAMSON provides intuitive and versatile move editors to transform these tasks into seamless operations.
What Are Move Editors?
Move editors in SAMSON are specialized tools that allow you to efficiently and accurately move, rotate, and position molecular structures, meshes, or other elements. They are designed to provide control over positions and orientations, offering options suitable for both novice and advanced users.
Here are the three main types of move editors in SAMSON and what they can do:
- Displacer: Move objects within the camera plane for quick positional adjustments. Shortcut: D.
- Local Move Editor: Translate and rotate objects based on their principal axes. Shortcut: M.
- Global Move Editor: Translate and rotate objects relative to the global XYZ frame. Shortcut: K.
How Do They Work?
Using the move editors is incredibly user-friendly. Let’s break down the functionality of one of the most versatile tools, the Local Move Editor.
Begin with Selection
Before moving objects, you need to select structures. Use tools like the rectangle selection editor to select atoms or groups of atoms easily. Once selected, the local move editor’s widgets become active for manipulation.
Translate and Rotate
The Local Move Editor comes equipped with translation and rotation widgets for versatile manipulations. Here’s how they are used:
- Central translation widget: Use the cross with arrows to translate the selection in the plane of the camera.
- Side translation widgets: Move objects along their principal axes using the straight arrows and planes.
- Side rotation widgets: Rotate around the object’s principal axes using the curved arrows.
- Trackball widget: Rotate freely in 3D with the sphere widget.
Snapping for Precision
If you require precision, the snapping feature can align translations and rotations to defined increments. For example, set translational snapping to 0.5Å or rotational snapping to 10° for exact modifications. Adjust these settings in the top-left viewport menu or in SAMSON’s preferences.
Examples in Action
Here are a few common use cases where the Local Move Editor shines:
- Camera plane translation: Drag the central translation widget to re-position atoms with real-time feedback.
- Rotating fragments: Use side rotation widgets to adjust dihedral angles effortlessly.
- Precision snapping: Align objects with controlled translational or rotational steps.
Why Use Move Editors in SAMSON?
Move editors are indispensable tools in molecular design workflows. They allow you to achieve precision adjustments without disrupting the accuracy of your molecular representations. Combined with the snapping feature and visual feedback, they provide robust solutions for complex modeling tasks, like aligning structures in preparation for simulations or editing specific molecular features.
To dive deeper into the capabilities of SAMSON’s move editors, check out the complete documentation at Moving Objects in SAMSON.
Note: SAMSON and all SAMSON Extensions are free for non-commercial use.