Make a crowded molecular model easier to read—one atom at a time

A molecular model can contain exactly the information you need—and still be difficult to explain. When many atoms and bonds compete for attention, viewers may struggle to follow the part of the structure you want to discuss. Hiding the surrounding atoms all at once can solve the clutter problem, but it can also make the change feel abrupt and leave the audience unsure what disappeared.

The Conceal atoms animation offers a more gradual way to simplify a view. It progressively hides selected atoms and the bonds between hidden atoms over time. This is a visibility change, not a transparency effect: the selected parts disappear from view rather than becoming increasingly see-through.

Use the transition to guide attention

A progressive reveal or conceal can help turn a dense structure into a sequence the audience can follow. For example, you might use it while presenting a molecular model to shift attention from a larger selection toward the region you want to discuss. The animation does not decide what is important; your selection and timing establish what the viewer sees and when.

That distinction is useful when preparing a presentation. Instead of asking viewers to interpret a crowded frame and mentally ignore parts of it, you can stage the change across the timeline. The model remains the subject, while the visibility transition helps make the explanation easier to track.

Build the animation in four keyframes

1. Select the atoms and bonds you want to conceal. The animation acts on the specified selection, so check that it contains the parts you intend to hide.
2. Add the effect. In the Animator, double-click Conceal atoms in the Animation panel.
3. Arrange the timing. The effect has four keyframes. Between keyframes 1 and 2, the selected atoms and bonds are shown. Between keyframes 2 and 3, they progressively disappear. Between keyframes 3 and 4, they are hidden.
4. Move the keyframes as needed. Adjusting their positions changes when the stages happen in your animation. Play the sequence back and check that the transition fits the pace of your explanation.

Pay attention to selection order

During the progressive part of the animation, atoms and the bonds between hidden atoms disappear according to their order in the selection. That means the selection is not only a list of what will be hidden: its order can affect how the transition unfolds. If the sequence matters to your explanation, review the selection and preview the animation rather than assuming the atoms will disappear in a particular spatial pattern.

You can also change how parameters are interpolated between frames using the Easing curve. This provides another way to tune the character of the transition. As with any animation choice, the most useful setting is the one that makes the structural change clear at the presentation’s pace.

A quick review before presenting

• Confirm that the intended atoms and bonds are selected.
• Check the four keyframe stages: shown, progressive concealment, then hidden.
• Preview the order in which selected atoms disappear.
• Move keyframes or adjust the easing curve if the transition is hard to follow.

Concealment works best when it supports a specific explanation: reduce visual competition, then let the audience focus on what remains visible. To see the animation details and examples, visit the Conceal atoms documentation.

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