A molecular model can be difficult to present when the whole structure appears at once. A sudden reveal may distract from the feature you want people to notice, while a static image gives no sense of how the model enters the scene. SAMSON’s Appear animation offers a simple way to make selected nodes progressively visible, helping you guide attention through a molecular presentation.
The key to using it well is choosing the right nodes. Structural models, visual models, meshes, and labels have a transparency attribute, so Appear can gradually change their visibility. Individual atoms and bonds do not have their own opacity attribute: to change their transparency, apply the animation to the structural model that contains them. If you select a node without a transparency attribute, Appear behaves similarly to the Show animation instead.
Build a reveal in three stages
First, select the nodes you want to reveal. Then open the Animation panel in the Animator and double-click Appear. The animation has four keyframes, arranged to create three useful stages:
- Keyframes 1–2: the selected nodes are fully transparent.
- Keyframes 2–3: the nodes progressively appear as their transparency decreases.
- Keyframes 3–4: the nodes remain fully opaque.
This structure is helpful when you want an object to be invisible before its reveal, become visible gradually, and then stay present for the rest of the presentation. You can move the animation’s keyframes to adjust when those stages occur. For example, you can give the reveal more room in the timeline if a gradual transition is important, or position it so the model is already visible when you begin discussing it.
Make the animation serve the explanation
Before adding the effect, decide what the viewer should notice first. If the aim is to introduce one part of a scene before another, apply Appear to the relevant nodes rather than treating the entire scene as a single object. This keeps the animation connected to the structure you are explaining. For atoms and bonds, remember to select their structural model when you need to control transparency; selecting individual atoms or bonds will not give them independent opacity changes.
Then check the reveal in context. The fully transparent interval gives you a starting point, the transition between the middle keyframes provides the gradual appearance, and the final interval lets the viewer examine the opaque model. If the transition feels too abrupt or too slow for the presentation, adjust the keyframe positions. You can also change how parameters are interpolated between frames by modifying the animation’s Easing curve.
One practical distinction: Appear is specifically useful when gradual transparency is available on the selected nodes. For nodes without that attribute, its behavior is similar to Show, so it may not create the same translucent-to-opaque transition. If the goal is to change the transparency of a molecular structure, target the structural model itself.
To access animations in the current interface, use the Animation panel in the Animator; the older Animation menu shown in some recordings is no longer present. For the full instructions and related details, see the Appear animation documentation.
Note: SAMSON and all SAMSON Extensions are free for non-commercial use. Get SAMSON.