Make the target position clear: a practical guide to docking animations

When preparing a molecular presentation, it can be difficult to show where a group of atoms or a mesh is meant to end up. A static image shows the final arrangement, but not the movement from the starting position. In SAMSON, the Dock animation can make that transition visible: it animates selected nodes toward their current positions, which are treated as the docked positions.

This is useful for explaining a structural arrangement in a presentation, or for making the relationship between a receptor and another structure easier to follow. It is important, though, to distinguish a visual animation from a molecular docking calculation: the animation presents movement toward positions already in the document; the documentation does not describe it as calculating or validating a binding pose.

Set up the selection deliberately

The selection determines how the animation behaves. Select at least two structural nodes or meshes. The first selected node acts as the static receptor, while the other selected nodes are animated. That makes selection order part of the setup, not just a way to identify which objects are involved.

If the receptor consists of several nodes, place those receptor nodes in a folder and select the folder first. Then select the nodes or meshes that should move. This provides a straightforward way to treat multiple receptor components as one static selection for the animation.

SAMSON may try to guess which nodes to animate when nothing is selected. For a presentation that needs to be predictable, explicit selection is the safer workflow: confirm the receptor is first, then include the structures you want animated.

Build the movement in the timeline

1. Select the receptor and the nodes or meshes that should move.
2. In the Animator, open the Animation panel and double-click the Dock effect.
3. Review the animation between its two keyframes, then move the keyframes as needed to fit the timing of your presentation.
4. If the movement is too small or too large for the view you want to communicate, inspect the animation and adjust its amplitude.

The starting positions are computed automatically away from the docked positions. The movement amplitude is also calculated when the animation is created, so the initial result may not match the timing or visual emphasis you have in mind. You can change that amplitude in the Inspector. The easing curve controls how parameters are interpolated between frames, giving you another way to adjust how the transition unfolds.

A quick review before presenting

• Check selection order: the receptor must be first; the remaining selected nodes are animated.
• Check the timeline: position the keyframes so the movement occurs at the intended point in the presentation.
• Check movement scale: inspect and adjust amplitude if the automatically computed movement does not communicate the arrangement clearly.
• Check the message: describe the animation as a visual transition to the current positions, rather than as evidence that a docking calculation found those positions.

These small checks help prevent a common presentation problem: a clear-looking animation that communicates the wrong setup. For the complete instructions and examples, learn more about the Dock animation.

Note: SAMSON and all SAMSON Extensions are free for non-commercial use. Get SAMSON.