A molecular structure can be scientifically accurate and still be hard to read on screen. When atoms and bonds overlap, it may be difficult to tell which parts are closer, how regions are oriented, or where one structure ends and another begins. The answer is not always to rotate the molecule again: SAMSON’s rendering preferences offer several visual cues that can make depth and shape easier to interpret.
This guide focuses on three useful options—ambient occlusion, shadows, and silhouettes—and how to try them without making the view harder to read or unnecessarily taxing your graphics card.
Start with ambient occlusion
Ambient occlusion darkens regions that are less accessible to light. In a molecular view, this can add shading around recessed or closely packed areas, helping the eye distinguish depth. SAMSON provides two types:
- Screen-space ambient occlusion is an efficient approximation, but its appearance is sensitive to the camera distance.
- Object-space ambient occlusion is more realistic, but slower.
If your main problem is that a structure feels flat, ambient occlusion is a sensible first effect to test. Keep in mind that changing the camera distance can change the appearance of the screen-space version, so judge it at the zoom level you intend to use.
Add shadows to clarify relative position
Shadows can help communicate where structures sit relative to one another. Without them, two nearby elements may be difficult to distinguish spatially, even when their colors and shapes are clear. If your view contains several components at different depths, try shadows and check whether their relative positions become easier to understand.
Rendering quality has a practical limit: on an older graphics card, shadows may affect performance. The preferences documentation recommends disabling shadows or choosing a lower preset in that situation. A useful test is to compare the same view with shadows on and off, then keep them only if the added depth cue helps your task.
Use silhouettes to separate regions
Silhouettes emphasize the outlines of structures and can make regions at different depths easier to distinguish. They are particularly worth testing when neighboring shapes blend together or when internal contours are difficult to follow. Ambient occlusion adds shading; shadows help indicate relative position; silhouettes make boundaries clearer. These effects address different visual problems, so it is often more useful to choose based on what is unclear than to enable everything by default.
A quick, controlled tuning workflow
- Open Interface > Preferences. On Windows or Linux, use Ctrl+K; on Mac, use Cmd+,.
- Use the Preferences search to find the rendering category you need.
- If Automatically test is checked, changes take effect immediately in the interface and rendering.
- Begin with the view that is giving you trouble, and change one effect at a time. This makes it easier to tell which adjustment actually improves depth perception.
- Check the structure at the camera distance you expect to use. In particular, screen-space ambient occlusion can change with distance.
- If rendering becomes sluggish on an older graphics card, consider disabling shadows or selecting a lower shadow preset.
The goal is not to make every structure darker or more dramatic. It is to make the spatial relationships relevant to your current task easier to see. A restrained combination—or a single well-chosen effect—can be clearer than layering on every available option.
For details on these and other interface and rendering settings, see the SAMSON Preferences documentation.
Note: SAMSON and all SAMSON Extensions are free for non-commercial use. Get SAMSON.