A Guide to Light Attributes in SAMSON’s Node Specification Language

In molecular modeling, handling light nodes effectively can be a critical task, especially when trying to visualize complex systems or fine-tune your workflow. If you’re working in SAMSON, an integrative molecular design platform, the Node Specification Language (NSL) provides a robust framework for specifying and managing attributes of nodes—entities such as atoms, molecules, or light sources in a simulation. This guide dives into light attributes in NSL and how they can make your modeling tasks smoother.

Why Light Attributes Matter

Light nodes play a crucial role in simulations and visual representations. Whether you’re adjusting the visibility of certain elements, toggling selection states, or working with specific naming conventions, understanding and using the light attribute space in NSL can bring clarity and precision to your work.

Overview of Light Attributes

Light attributes in NSL belong to the light attribute space, which is shortened to li for convenience. They are designed to match only light nodes. Here’s a helpful breakdown of key attributes:

Attribute	Short Name	Possible Values	Usage Examples
hidden	`h`	`true`, `false`	`li.h` `not li.h`
name	`n`	strings in quotes	`li.n "A"` `li.n "L*"`
selected	(None)	`true`, `false`	`li.selected` `not li.selected`
selectionFlag	`sf`	`true`, `false`	`li.sf` `li.sf false`
visibilityFlag	`vf`	`true`, `false`	`li.vf` `li.vf false`
visible	`v`	`true`, `false`	`li.v` `not li.v`

How to Use Light Attributes

Light attributes are particularly useful for customizing visualizations and managing selections. For example:

Toggling visibility: You can set the visibility of light nodes with the visible attribute (li.v). Use this to focus on specific light sources by hiding others.
Filtering by name: Match specific nodes based on naming patterns using the name attribute. For instance, li.n "L*" matches all light nodes whose names start with “L”.
Selection management: Need to ensure certain light nodes are selected or deselected? The selected and selectionFlag attributes come to the rescue.

Inherited Attributes

Many light attributes are inherited from the parent node attribute space. For example, hidden, name, and visibilityFlag are originally defined for nodes of any type, not just lights. However, some inherited attributes—like selected—might behave slightly differently, so it’s worth checking their descriptions in the documentation.

Boost Your Workflow

By utilizing these light attributes, you can enhance the efficiency of your molecular modeling tasks. Whether sorting out visual clutter, focusing on specific elements, or automating repetitive selections, these tools can significantly optimize your workflow.

For more details and examples, check out the official documentation page.

SAMSON and all SAMSON Extensions are free for non-commercial use. You can download the platform from SAMSON Connect.