Molecular modeling often requires dynamic simulations to predict properties, test hypotheses, or observe how molecular structures behave under specific constraints. If you’ve ever wondered how to interactively simulate molecules in real time while maintaining full control, SAMSON offers a flexible solution.
What Makes Interactivity Important in Simulations?
One key pain point for molecular modelers is that traditional simulations often feel static or rigid. You initiate them, wait for results, and then analyze the outcomes. But what about making adjustments during the simulation itself? This is where SAMSON shines: its interactive simulations allow users to manipulate atoms in real-time, making it possible to immediately observe how a system responds.
Getting Started: Adding a Simulator
To perform an interactive simulation, you first need to add a simulator to your document in SAMSON. If you’re new to SAMSON, here’s a step-by-step breakdown:
- Start with building or loading a molecular structure. Use the Asset Browser to load a molecule or switch to the “Add editor” in the left menu to place individual atoms in the viewport.
- Once the structure is ready, click Edit > Add simulator (shortcut: Ctrl + Shift + M on Windows/Linux or Cmd + Shift + M on Mac).
- Select your desired interaction model, for example, “Universal Force Field (UFF).” Interaction models define how forces and energies are computed in the simulation.
- Choose a state updater, such as “Interactive modeling”, which enables live interactions during simulation. You can also name the simulator for better organization if you wish.
- Press “OK” to finalize the setup.
Once added, the simulator—including the interaction model, state updater, and dynamical model—is visible in the Document view. Here’s how that looks in practice:
Smooth Interaction During Simulations
You’ve added a simulator—great! Now it’s time to launch the simulation:
- To start the simulation, click Edit > Start simulation or use the shortcut X.
- When the simulation is running, you can click and drag atoms directly in the viewport to see how the rest of the molecule interacts and responds in real-time. This is especially useful for studying structural flexibility or rearrangements.
- To stop the simulation, use Edit > Stop simulation (shortcut: X again).
The flexibility here is what makes SAMSON unique. You can tweak parameters such as step size and simulation steps in the Interactive modeling state updater to make the system feel stiffer or more relaxed, depending on your modeling needs.
A Closer Look with Visual Feedback
Interactive simulations become truly powerful when paired with visual feedback. As you drag an atom, the software recalculates forces, geometries, and interactions on the fly—all guided by the underlying physics model. For instance, in this example of interaction using Universal Force Field and an interactive modeling state updater, note how the geometry adjusts:
Why Choose Interactive Simulation?
By allowing adjustments mid-simulation, SAMSON ensures that no opportunity is missed to refine a model or test a new idea instantly. Whether you are designing novel structures, running geometry optimization, or performing molecular dynamics studies, interactivity brings a level of intuition and immediacy that static simulations can’t offer.
To learn more about interactive simulations and how to use simulators effectively, visit the official documentation page.
*Note: SAMSON and all SAMSON Extensions are free for non-commercial use. Discover SAMSON and its amazing capabilities by downloading it at SAMSON Connect.