Rhinoceros

Rhino's mathematical foundation is NURBS (Non-Uniform Rational B-Splines), enabling exact representation of complex freeform curves and surfaces. Use degree-3 curves for most modeling (good balance of smoothness and control). Increase degree only for highly flowing surfaces (automotive, yacht hulls). Keep control point counts minimal for clean surfaces.

Grasshopper provides visual programming for parametric/generative design within Rhino. Build node graphs connecting inputs (sliders, points) through operations (loft, offset, divide) to outputs. Use data trees for managing lists of geometry. Internalize data for portable definitions. Cluster repeated logic into reusable components.

Use SubD (subdivision surfaces) for organic forms that are difficult with NURBS. Start from a simple box mesh, then subdivide and manipulate control vertices. Convert SubD to NURBS with 'ToNURBS' for downstream manufacturing accuracy. SubD offers real-time smooth preview while maintaining low-polygon editability.

NURBS provides mathematically exact surfaces for manufacturing; meshes (STL/OBJ) approximate geometry with triangles. Use NURBS for CAD/CAM precision; use meshes for 3D printing, rendering, and game assets. Convert between formats with 'Mesh' (NURBS→mesh) and 'MeshToNurb' (mesh→NURBS patches) commands, understanding fidelity trade-offs.

Enable Gumball for on-object transform controls: drag arrows to move, arcs to rotate, scale handles to resize. Hold Ctrl while dragging to copy. Relocate Gumball origin by holding Alt+click. Set Gumball to align with CPlane, Object, or World coordinates. Gumball provides faster manipulation than separate Move/Rotate commands.

Rhino's command line accepts typed commands, aliases, and options. Create short aliases (e.g., 'ss' for SelSrf, 'ep' for ExtractPt) in Options > Aliases. Use command history (F2) to recall previous operations. Type dash-prefix (-Command) for scriptable command-line-only versions without dialog boxes.

Save Layer States to capture current visibility, color, and lock configurations. Switch between states for different view requirements (structural, interior, exterior). Export states between files for consistency. Use Layer State Manager to restore states before plotting or exporting specific discipline views.

Generate 2D vector drawings from 3D models using Make2D. Select objects, choose projection direction, and configure options (maintain source layers, project clipping planes). Results are flat curves suitable for technical illustrations, laser cutting files, or CAD documentation. Group output by visibility type (visible, hidden).

Save Named Views for quick navigation to key camera positions. Use for presentation walkthroughs, detail checking, and layout viewport references. Configure display mode per named view (Rendered, Arctic, Technical). Use Floating Viewports for multi-angle editing. Four-viewport layout provides simultaneous top/front/right/perspective views.

Use QuadRemesh to convert triangle meshes or NURBS to clean quad-dominant meshes suitable for SubD editing and animation. Set target quad count, enable symmetry detection, and adjust adaptive size. Guide edge flow with curves. QuadRemesh is essential for reverse engineering scan data into editable SubD topology.

Use RhinoCommon (.NET API) for full access to Rhino's geometry library: create/analyze/modify curves, surfaces, and meshes programmatically. Develop compiled plugins (.rhp) in C# using Visual Studio. Access document objects, views, and display. RhinoCommon offers higher performance and stronger typing than rhinoscriptsyntax Python API.

Use Worksessions to coordinate multi-user projects—each team member works on their .3dm file while seeing others as read-only references. Save worksession (.rws) files defining the file set. Unlike blocks, worksession files maintain independent save states. Use for large projects with discipline separation.

Import point clouds (LAS, E57, XYZ) for as-built documentation and reverse engineering. Use section cuts through clouds to trace 2D profiles, then loft/sweep to recreate surfaces. RhinoResurf or Mesh2Surface plugins provide semi-automated surfacing workflows. Decimate clouds for manageability while preserving key features.

Use IronCAD's built-in KeyShot rendering integration for photorealistic images. Assign materials from the KeyShot library, set environment lighting, and render. For quick visualization, use the 'Realistic' display style in the viewport. Export rendered images at high resolution for marketing materials and client proposals.

Customize display modes (Wireframe, Shaded, Rendered, Arctic) for different workflow stages. Create custom modes with edge softening, ambient occlusion, and skylight. Use 'Raytraced' for GPU-accelerated realtime rendering. Export high-resolution viewport captures for quick presentations without dedicated render setup.