Magic Build3D graphical input builder

Summary form only given. The widely-employed MAGIC finite difference electromagnetic particle-in-cell code (FDTD EM-PIC) tool suite [1] has been upgraded to include a graphical three-dimensional (3D) input builder, Build3D. The tool enables visualization of multiple views and components of complex geometries input via toolbars and menus, as well as from MAGIC- and Sketchup-generated input files. The Build3D code writes output suitable for execution in MAGIC3D.