Master Precise Molecular Manipulations with SAMSON’s Move Editors

Molecular modelers often face the challenge of precisely positioning and orienting atoms, molecules, or structures within their molecular designs. Whether you need to align molecules for docking studies, move fragments for analysis, or simulate interactions efficiently, having the right tools for precise manipulation is essential. In this post, we’ll explore how Move Editors in SAMSON simplify this task, offering detailed control over translations and rotations, and even snapping for exact adjustments.

Meet the Move Editors

SAMSON’s suite of Move Editors provides an intuitive way to manipulate molecular structures, meshes, and labels. Here’s an overview of the three main editors available:

  • Displace editor Displacer: Moves objects within the camera plane. It’s ideal for interactive simulations, where you need to reposition objects dynamically.
  • Local Move Editor Local Move Editor: Provides translation and rotation along an object’s principal axes. Perfect for editing dihedrals or manipulating objects relative to their local geometry.
  • Global Move Editor Global Move Editor: Enables translation and rotation along the global XYZ axes, making it easy to align objects based on the universal reference frame.

Detailed Control with the Local Move Editor

Need an example of precise control? Let’s take a closer look at the Local Move Editor. This editor allows you to perform fine-grained transformations:

  • Translation: Use the central widget (a cross with arrows) to move selected objects within the camera plane. Other widgets let you move objects along their principal axes or specific planes.
  • Rotation: Rotate objects using the curved arrows representing the three local axes, or use the trackball widget for free-angle adjustments.

The widget colors provide guidance:

  • light blue Light Blue: Local X axis
  • mid blue Mid Blue: Local Y axis
  • dark blue Dark Blue: Local Z axis

Here’s an example of editing dihedral angles using the Local Move Editor:

Edit dihedral angle

Optimized Adjustments with Snapping

When precision is crucial, snapping features can save time and enhance accuracy:

  • Translational snapping: Align translations to defined increments. For example, set snapping to 0.5Å to move selections with exact spacing.
  • Rotational snapping: Adjust rotations to predefined angles, such as every 10°, for consistent alignment across models.

You can configure these preferences in the editor’s quick access menu or the application’s interface settings (Interface > Preferences > Editors > Snapping).

Viewport menu: snapping

Moving with the Global Move Editor

The Global Move Editor caters to needs requiring transformations along the global axes. It’s an excellent choice for applications where global alignment is central, such as arranging models symmetrically or aligning structures for visualization or simulations. For example:

  • Translate objects along the global X, Y, or Z axes using the straight arrow widgets.
  • Use plane widgets to shift objects along a combination of axes.
  • Rotate freely using the trackball widget or align rotations to specific global axes using curved arrow widgets.

The widget colors for the global axes are:

  • red Red: X axis
  • green Green: Y axis
  • blue Blue: Z axis

The global move editor controller

Conclusion

SAMSON’s Move Editors are essential tools for any molecular modeler looking to refine their workflows and achieve precise control over molecular structures. Experiment with the editors and snapping features to unlock new possibilities in your molecular designs! Learn more.

Note: SAMSON and all SAMSON Extensions are free for non-commercial use. Get your copy at SAMSON Connect.

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