A molecular scene can contain all the right information and still be difficult to read. Atoms overlap, depth is ambiguous, edges look jagged, and a protein may seem to float against its surroundings. Before changing the structure or rebuilding the scene, try adjusting how the viewport communicates depth and separation.
SAMSON’s real-time rendering effects address different parts of this problem. The useful trick is to treat them as a small set of visual tools, not as a collection of switches to turn on all at once. Begin with the feature that addresses the specific confusion in your scene, then check whether the result is clearer at the scale where you actually work.
Start with depth cues
Ambient occlusion darkens regions that are less accessible to light, helping nearby molecular features feel more distinct. Screen-space ambient occlusion is a quick approximation, though its appearance can be sensitive to camera distance. Object-space ambient occlusion is more realistic but slower. If a structure looks too flat, try screen-space ambient occlusion first and compare the same view with it off.
Shadows are useful when the question is about relative position: for example, whether a molecule sits in front of or behind a surface. Compare the views below. The point is not simply to make the scene darker; it is to make spatial relationships easier to judge. If you use an older graphics card, the documentation recommends disabling shadows or choosing a lower preset.
Make boundaries easier to follow
Silhouettes help separate regions at different depths by emphasizing their outlines. They can be especially helpful when a ribbon representation blends into neighboring parts of the scene. Try enabling silhouettes and setting their thickness to 1, as in the documented 1YRF example, then decide whether the added outlines improve your view or compete with its detail.
If the edges themselves look rough, adjust anti-aliasing. FXAA is described as an efficient option for many recent graphics cards, and the documented “Higher quality” preset uses FXAA with multisampling set to 2. Anti-aliasing uses more GPU rendering, however, so large systems may run more slowly. Treat it as a quality-versus-performance choice: smooth edges are helpful, but responsiveness matters while navigating.
Keep the background and lighting working for you
A background is not just decoration; it affects how easily you can distinguish the model from its surroundings. In Preferences, the background choices include SAMSON, black, white, a custom top-to-bottom gradient, and an image. A custom gradient can provide contrast without forcing every part of the view onto a uniform field. You can also switch backgrounds through Visualization > Options or at the bottom of the viewport.
Lighting changes the way surfaces read. The two point lights have controls for color, intensity, specular intensity, specular power, and position. High specular intensity makes surfaces look more plastic; lower values make them look more matte. For a flat-lighting appearance, the documented settings are to set both light intensities to zero, ambient light to 0.8, and Fresnel power to zero. This gives you a specific baseline to compare against rather than adjusting controls without a reference.
Use depth effects with intention
Fog progressively blends distant parts of the scene with the background. Its near and far distances define where the effect begins and reaches full strength; the strength controls how quickly it appears. Fog can help draw attention to the foreground, but distant objects may become invisible after the far distance, so avoid it when those parts carry information you need to inspect.
Depth of field simulates camera focus by blurring distant parts of a molecule. It can create a stronger sense of focus, but blur can also hide detail. The documentation suggests enabling the effect, setting strength to 80, and zooming in on a molecule as a way to see its impact. Compare the result with the effect off before using it for close inspection.
A quick, repeatable check
- Choose a representative view and note what is hard to read: depth, boundaries, jagged edges, or foreground focus.
- Open Visualization > Options to switch effects and presets on or off quickly.
- Change one effect at a time, comparing the same view so you can tell what actually helped.
- If a quick preset is not enough, use the relevant section of Preferences > Rendering to adjust parameters.
- Recheck performance and make sure the visual effect has not obscured important molecular detail.
This approach keeps the rendering choices tied to the modeling task: use ambient occlusion or shadows when depth is unclear, silhouettes when regions merge, anti-aliasing when edges distract, and fog or depth of field only when selective emphasis is useful. For the full effect reference, visit the SAMSON rendering effects documentation.
Note: SAMSON and all SAMSON Extensions are free for non-commercial use. Get SAMSON.