As a molecular modeler, you often need precise control to move, align, and rotate molecular structures or other objects within your workspace. A lack of robust tools for such tasks can result in inefficiencies or inaccuracies in your workflow. Fortunately, SAMSON provides an excellent solution with its Move Editors — versatile tools tailored for precision in molecular adjustments.
What are Move Editors?
Move Editors in SAMSON are specialized tools designed to reposition or orient selected molecular objects with accuracy and control. Whether you are working with molecules, atoms, meshes, or lights, Move Editors allow you to adjust their positions and orientations both interactively and precisely. Here, we’ll dive into the primary Move Editors in SAMSON:
- Displacer: A simple yet effective editor for moving objects in the plane of the screen (camera plane).
- Local Move Editor: Ideal for translations and rotations relative to the selected object’s principal axes.
- Global Move Editor: Perfect for transformations along the global XYZ axes.
Each editor is accessible via shortcuts (D for the Displacer, M for the Local Move Editor, and K for the Global Move Editor), and you can switch between them seamlessly to refine your modeling workflow.
Using the Local Move Editor
The Local Move Editor is a particularly useful tool in SAMSON for achieving precision in molecular transformations. Let’s see how it works:
- Translate: Use the central translation widget — a cross with arrows — to move objects within the camera plane. You can adjust the motion by enabling snapping features for incremental movements (e.g., 0.5Å).
- Rotate: To rotate around the object’s local axes, use the side rotation widgets (curved arrows), or utilize the trackball for free rotations on a sphere. Snapping can again be activated, allowing controlled angular increments, such as 10°.
With the Local Move Editor, you can even edit complex features like dihedral angles, providing fine control over molecular conformations. Below is an example animation demonstrating its intuitive and robust transformation features:
Snapping for Precision
One of the standout features of SAMSON’s Move Editors is the snapping mode. Snapping allows you to move and rotate objects in precise increments, making it easy to align objects to specific planes or axes:
You can control the snapping values via the editor’s quick access menu or in the Preferences menu (Interface > Preferences > Editors > Snapping). This feature is especially useful for repetitive tasks like aligning multiple objects in a symmetrical arrangement or fine-tuning rotations for intricate modeling.
Interactive Precision
The Move Editors also support interactive transformations. For example, to translate a selected set of atoms:
- Select the desired atoms using the rectangle selection tool.
- Press the left mouse button on the desired translation widget and drag to the desired position. Applied transformations display visually, and changes can be undone using Edit > Undo.
This visual and interactive workflow ensures a smoother modeling experience, with fewer errors and streamlined adjustments.
Conclusion
With SAMSON’s Move Editors, you gain access to a set of intuitive, precise, and feature-rich tools for molecular manipulations. Whether adjusting a molecule’s conformation, aligning objects to global axes, or performing complex rotations, these tools can significantly enhance your productivity and precision in molecular design.
To explore these tools in greater depth, visit the official documentation page on Moving Objects.
Note: SAMSON and all SAMSON Extensions are free for non-commercial use. Download SAMSON today at https://www.samson-connect.net.