Mcnp Visual Editor -

| Task | Manual Text Editing | MCNP-VisEd | |------|---------------------|-------------| | Create a cylinder inside a sphere | Write surface cards manually, calculate intersection logic. | Click “Add Cylinder,” click “Add Sphere,” select “intersection” from dropdown. | | Find overlapping cells | Scan output error logs, manually check coordinates. | Automatic red highlighting of overlapping regions. | | Locate a missing surface | Search text file. | Visibly absent surface in 3D view; warning dialog. | | Rotate/translate a complex part | Recalculate all surface coefficients. | Select part → translate/rotate interactively → code updates automatically. |

: The full-featured version that allows for creating and modifying input files . Mcnp Visual Editor

However, for much of its history, MCNP carried a notorious barrier to entry: its input syntax. Creating a complex geometry using text-based cell and surface cards often felt like programming in the dark. A single misplaced negative sign or an incorrectly defined intersection could render a model unusable, leading to hours of debugging "fatal errors." | Task | Manual Text Editing | MCNP-VisEd