A molecular presentation can be scientifically sound and still be difficult to follow if its visual setting keeps changing unexpectedly. A background that clashes with a structure, or a slide image that gets cropped in an awkward place, can distract viewers from the model. SAMSON’s Set background animation lets you choose when a background changes and, when multiple backgrounds are present, how the presentation transitions between them.
Choose a background that supports the content
The animation can set a background between two frames. You can also use an image, such as a presentation slide. When using an image, choose whether it should be fully contained in the viewing area or cover it. Containing the image keeps the whole image visible; covering the area may crop part of it along the larger side.
That choice is useful to consider before placing the animation. If every part of a slide matters, keeping it fully contained avoids losing content to cropping. If filling the available area matters more, covering it may be preferable—but check that important labels or diagrams remain visible.
Set the change at the right moment
In the Animator, open the Animation panel and double-click Set background. The animation’s beginning keyframe is placed at the current frame. You can then move the keyframes as needed, so you are not locked into the frame where you first added the effect.
The animation has two keyframes. At keyframe 1, the specified background is set. After keyframe 2, if another Set background animation has been specified, the presentation can interpolate between the backgrounds. In practice, this gives you a way to plan background changes alongside the sequence of your presentation rather than changing the visual setting at an arbitrary point.
For a clearer result, decide what each section of the presentation is meant to communicate, then place background changes where that visual context should change. For example, a slide image can provide supporting material for one part of the presentation, while another background can be used for a later section. Keep the molecular model as the focus: the background should help viewers orient themselves, not compete with the structure.
Use easing to shape the transition
When multiple backgrounds are present, SAMSON performs interpolations between them. You can control the interpolation by changing the easing curve in the Inspector. This is useful when the timing of a transition matters to the rhythm of a presentation. A transition that feels too abrupt or too gradual may draw attention away from the molecular content; adjusting the easing curve lets you tune how the interpolation progresses between frames.
After making a change, review the relevant section of the presentation to check both the selected image behavior (contained or cover) and the transition between backgrounds. These are separate considerations: image fitting determines whether the image is cropped, while the easing curve controls interpolation between backgrounds.
For the animation steps and available properties, see the Set background documentation.
Note: SAMSON and all SAMSON Extensions are free for non-commercial use. Get SAMSON.