How to create a temporary guide line for accurate drawing in Rhino?
Short Answer
Yes — in Rhino 3D, the most common way to create a temporary guide line for accurate drawing is to use Line with Object Snaps and SmartTrack enabled. This lets you project temporary alignment paths without adding permanent construction geometry. Limitation: SmartTrack guides are visual aids and are not saved as editable objects.
What You Need to Know Before
Warning: SmartTrack only works reliably after you acquire tracking points, so many users think it is broken when no guide line appears. If Object Snaps are off, or you are snapping to unstable geometry like dense meshes, your temporary guide can align to the wrong location.
How to Create a Temporary Guide Line in Rhino
Command: SmartTrack
Shortcut: None by default
Quick Steps:
- Turn on SmartTrack from the status bar at the bottom of the Rhino window, and make sure Osnap is also enabled.
- Hover over a snap point such as End, Mid, or Cen until Rhino acquires the point, then move the cursor away to generate a temporary tracking guide.
- Start the Line command and click where the SmartTrack guide intersects your intended direction to place the line accurately.
Variables & Settings
Key Setting: SmartTrack toggle in the status bar
Expert Setting: SmartTrack must be enabled before temporary tracking lines appear. For best results, also enable specific Osnaps such as End, Mid, Near, or Cen, because SmartTrack depends on acquired snap points to generate guide paths.
Why it Fails
- Cause 1 (Geometry): No valid reference point was acquired, so Rhino has nothing to track from and no temporary guide appears.
- Cause 2 (layers/Locks): The reference object is on a locked layer, making it difficult or impossible to snap to the intended point during tracking.
- Cause 3 (Command/Logic): Users expect SmartTrack to create actual geometry, but it only displays temporary alignment guides unless you place real objects with a drawing command.
Quick Fix & Best Practice
- Quick Fix: Turn on Osnap and SmartTrack, then pause briefly over an endpoint before moving the cursor to establish the guide.
- Manager’s Verdict: Use SmartTrack for fast layout and alignment during sketching and modeling, but switch to real construction lines when the reference must remain visible for team edits or later revision control.
FAQ
How do I show temporary alignment lines in Rhino?
Enable SmartTrack in the status bar and acquire a snap point with Osnap.
Can SmartTrack create permanent guide lines in Rhino?
No, SmartTrack only shows temporary visual tracking paths.
What is the best snap mode to use with temporary guides in Rhino?
End and Mid are the most common choices for accurate temporary alignment.
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