FreeCAD Plot Workbench for Scientific Data

The FreeCAD Plot workbench provides integrated data visualization tools designed to analyze, plot, and display scientific and engineering data directly inside the FreeCAD environment. By utilizing Python’s Matplotlib library, it allows users to transform raw numerical arrays, simulation results, and experimental datasets into clear, publication-ready 2D graphs without relying on external plotting software.

Primary Purpose and Core Functionality

The fundamental goal of the Plot workbench is to bridge the gap between parametric 3D modeling and scientific computation. In engineering workflows, geometric models frequently produce or rely on numerical datasets, such as structural stress analyses, fluid flow dynamics, thermal variations, or motion studies. The Plot workbench allows users to visualize this information natively alongside their CAD projects.

Direct Integration with Matplotlib

Under the hood, the Plot workbench is built as a graphical wrapper around Matplotlib, standardizing scientific plotting in FreeCAD. It provides a simplified graphical user interface (GUI) to configure complex plotting parameters, including:

  • Axes and Grid Configuration: Modifying scales (linear or logarithmic), setting tick intervals, and adjusting range limits.
  • Series Customization: Defining curve colors, line widths, point markers, and line styles.
  • Annotations: Adding titles, axis labels, legends, and text markers to make datasets readable and scientifically accurate.

Because it relies on standard Python infrastructure, advanced users can manipulate plot objects via the FreeCAD Python console for automated data processing and custom graphing tasks.

Visualizing Simulation and Tabular Data

The Plot workbench works seamlessly with other FreeCAD workbenches:

  1. Finite Element Method (FEM): Users can extract numerical outcomes—such as load-displacement curves or temperature distributions over time—and plot them directly to evaluate structural performance.
  2. Spreadsheet Workbench: Datasets collected in FreeCAD's built-in spreadsheets can be read directly by the Plot workbench to produce scatter plots, line charts, or bar graphs.
  3. External Scientific Datasets: Numerical arrays imported via Python scripts or CSV files can be quickly visualized to compare physical test data with digital CAD approximations.

Exporting for Reports and Publications

In addition to real-time viewing inside the 3D application, the Plot workbench enables users to export high-resolution vector and raster graphics. Supported formats typically include SVG, PDF, and PNG, allowing engineers and researchers to export clean, publication-ready figures for technical documentation, academic papers, and client reports. By centralizing visualization, it streamlines the scientific review process and reduces reliance on third-party tools.