MCNP Parser and CAD Processor

Cyclone converts an MCNP input into a structured set of operational instructions. Large cells are divided into smaller sub-cells, and each cell is represented as a Part, which may contain elements, operations, senses and transformations. An element can be another Part, a Surface, a Lattice, or a Universe. A designated master universe (typically Universe 0) is used as the starting point, and the Cyclone CAD processor builds each Part in turn until the full model is assembled.

The resolution for parts can be set between 4 and 64. Higher values (e.g., 64) produce a more realistic appearance, while lower values (e.g., 4) result in a more cuboidal form. Resolution affects only parts that are not square or rectangular.

Once the CAD model has been generated, it is passed to the 3D view. Users may choose to build the complete CAD model or generate only a partial model when working with lattices. Small lattices can be modelled effectively, but for large, multi-layered lattices it is recommended not to build the full CAD model. While Cyclone is not limited by memory, complex lattice models can require significant time and storage, potentially exceeding available resources.

Even when the full CAD model is not built, Cyclone includes a built-in raytracer that does not require CAD construction and can still render complete models.