A molecular scene can become difficult to follow when a component disappears all at once. A sudden change may leave viewers wondering whether the structure was removed, hidden, or simply replaced. A gradual fade offers a calmer way to shift attention: the selected nodes remain visible at first, become progressively transparent, and end fully transparent.
In SAMSON, the Disappear animation is useful when you want to reduce visual clutter or guide an audience from one part of a molecular scene to another without an abrupt cut. For example, you might fade a model out before focusing on a different part of a presentation. The animation changes visibility over time, so viewers can see that the scene is transitioning rather than changing instantaneously.
Choose the right thing to fade
Before adding the animation, select the nodes you want to disappear. This matters because Disappear works differently depending on the selected node’s attributes. Structural models, visual models, meshes, and labels are examples of nodes that can have a transparency attribute. Those nodes can gradually become more transparent.
Individual atoms and bonds do not have their own opacity attribute. Their structural models do. So, if your goal is to fade atoms and bonds, apply the animation to the relevant structural model, rather than selecting individual atoms or bonds and expecting their transparency to change. This distinction can save time when an animation appears not to affect the elements you selected.
For nodes without a transparency attribute, Disappear behaves similarly to the Hide animation. If you specifically need a gradual transparency change, check that the selected node supports transparency before building the rest of the sequence.
Build a fade that fits your presentation
To add the effect, choose the desired nodes, then double-click Disappear in the Animation panel of the Animator. The animation contains four keyframes, which define the transition:
- Between keyframes 1 and 2, the selected nodes are fully opaque.
- Between keyframes 2 and 3, they progressively become more transparent.
- Between keyframes 3 and 4, they are fully transparent.
The keyframes are movable, so you can adapt the transition to the pacing of your presentation. If viewers need time to inspect the structure before it fades, position the start of the transparency change later. If the fade should happen over a longer portion of the animation, adjust the keyframes to give that change more room. There is no need to treat the default keyframe spacing as a fixed storytelling choice.
You can also modify the easing curve, which changes how the parameters are interpolated between frames. This gives you a way to adjust the character of the transition without changing the basic purpose of the animation. Consider the visual result in the context of the surrounding animation: the fade should help clarify what is changing, not distract from the molecular detail you want viewers to notice.
A practical check before sharing
Play through the sequence and check three things: whether the intended model or label is fading, whether the transition is easy to follow, and whether the final transparent state leaves the scene in the condition you expect. If atoms or bonds remain visible when you meant to fade them, revisit the selection and apply the effect to their structural model. If the transition feels abrupt or too slow for your presentation, move the keyframes and review the easing curve.
Used this way, Disappear is more than a way to remove an object from view. It is a small presentation tool for managing attention while keeping the change understandable. To see the original instructions and related details, read the Disappear animation documentation.
Note: SAMSON and all SAMSON Extensions are free for non-commercial use. Get SAMSON.