Interface, viewports and precision
Rhino is command-line driven and designed for precision. Learn its viewports, snaps, construction planes and the Gumball so every point you pick is exact.
In this lesson you will
- Navigate the four viewports
- Use commands, options and repeat
- Draw precisely with osnaps, Ortho and coordinates
- Transform objects with the Gumball and CPlanes
Viewports and navigation
The default layout has Top, Front, Right and Perspective viewports. Right-drag pans in parallel views and rotates in Perspective; the wheel zooms; double-click a viewport title to maximise it. ZoomExtents (or the Zoom Extents button) fits everything.
Commands
Type commands at the command line — Line, Polyline, Circle, Move. Rhino autocompletes. Options appear in the prompt as clickable words. Enter, Space or a right-click repeats the last command; Esc cancels. Every toolbar button is just a command, so learning names makes you faster.
Precision
- Osnaps (bottom bar): End, Near, Point, Mid, Cen, Int, Perp, Tan, Quad. Tick a few; Alt temporarily disables them.
- Ortho (F8 or Shift held) constrains to 90° steps; Planar keeps points on the same height.
- Coordinates: type
0,0,0for absolute,r10,5for relative,<45to lock an angle, or type a distance to lock length while you pick direction.
- SmartTrack gives temporary tracking lines from snapped points.
Construction planes and the Gumball
Each viewport draws on its construction plane (CPlane). Set a CPlane to an object's face with CPlane › Object to draw on angled surfaces. The Gumball widget on a selection moves (arrows), rotates (arcs) and scales (squares) directly; click a handle and type a value for precision.
Quick reference
| Command / tool | How to start it | What it does |
|---|---|---|
| ZoomExtents | Command line | Fits the model in view |
| Osnap | Status bar | Object snaps |
| Ortho | F8 / Shift | Constrains to set angles |
| CPlane | Command line | Sets the construction plane |
| Gumball | Status bar | Direct transform widget |
Common mistakes
Objects drawn at the wrong height.
You picked in a different viewport's CPlane; use Planar or snap to existing geometry.
Snaps grab the wrong point.
Reduce active osnaps or use a one-off snap.
Exercise
Precise drafting
- Draw a 600 × 400 rectangle from 0,0,0.
- Draw a circle centred on its midpoint of one side.
- Set the CPlane to a sloped face of a box and draw on it.
- Move and rotate an object with the Gumball using typed values.
You should end up with: Exact geometry drawn in several planes.
Checklist
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Lesson quiz
Which key temporarily disables object snaps while held?
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Free KitWren tools that help
- Length ConverterConvert between metres, centimetres, millimetres, kilometres, inches, feet, yards and miles.
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- Area ConverterConvert square metres, square feet, acres, hectares and more.
- Image ResizerResize images to exact pixel dimensions or by percentage, keeping the proportions if you like.
- Merge PDFCombine multiple PDFs into one file, in any order, choosing which pages to include from each.
Free, independent learning material written for KitWren. Rhinoceros, Rhino and Grasshopper are trademarks of Robert McNeel & Associates. KitWren is not affiliated with, sponsored or endorsed by Robert McNeel & Associates. We never provide software downloads, licence keys or cracks — use the official sources.