What is Osnap

Many people just don’t use this really valuable tool at first, and after some time they are asking themselves how on earth could they model without it.

I sure know I’m one of them.

Imagine you are working on some sort of technical project, I don’t know, you are designing a house, or making some sort of technical documentation for any kind of object. How would you feel if you had to do final documentation and blueprints without a ruler, compass, set square… Pretty impossible, right? Well, this is the same thing about Osnap. If you never use it, it is impossible to model accurate models.

You will find yourself in situations where osnap will simply get in your way, so you can disable or enable it at your will.

Maybe to better understand, I will first explain what Snap is. Some of you who are new to modeling in general, probably don’t know what snap is. So here it is. Snapping is simply a helper for accuracy. Notice how my cursors kind of stickies for the grid intersections? Well, thats it!

[flashvideo filename=http://www.rhino3dhelp.com/wp-content/uploads/2008/02/osnap.flv /]

By default after installing a fresh copy of your Rhinoceros the Osnap toolbar is disabled. You simply click on Osnap in the bottom toolbar to open it. Now, you have all sorts of options for Osnap, and one of them is Disable. Naturally, if the check box is checked, then it is Disabled, if not, it is Enabled.


Ok, I’ll explain each option our OSnap has.


When this is checked, your cursor snaps to the end of all objects, lines, edges, surfaces…


When this is checked, your cursor snaps near any object. That means you can create lines on other edges, or anywhere where some other object already resides.


Snaps to Point objects only.


Snaps to middle of lines, curves, edges.


Snaps to center of an object, usually if you have some curvy objects, it determines where the center of it is. Center of arc, circle, or similar.


Snaps on intersection of objects. Lines and edges usually.


If you want to start (or end) a line but make it perpendicular to some reference line, this is what you need.


If you are creating a line that needs to be tangent on circle or similar, this is it.


Snaps to quads.


Snaps to knots.

10 Responses to “What is Osnap”

  1. Kriti says:

    Simple but Good one we actually forget to use it at times.

  2. Ivan Vuzem says:

    well theres a lot more osnap options hidden there, but I can’t actually imagine work in Rhino without constantly using osnap! 😉

  3. Espen says:

    Is there anney hotkeys to osnap? snap, etc?

  4. Sam says:

    Dont know about hotkeys but if you have ortho and snap on and want to turn them off for a point or line just press and hold Shift + Alt.

    Shift for Ortho
    Alt for Snap.

  5. New at rhino says:

    What if the Osnap “button” in my bottom toolbar doesn’t work?? I try to enable it, but the check box is not getting checked… :/ What to do??

  6. […] rectangle, and position it like on the image (here you will find very useful snap turned on, and in osnap End […]

  7. Duncan says:

    I use osnap all the time. Really, really useful.

  8. Blastered says:

    a feature that is not mentioned here is

    if you press ctrl key when your cursor is on osnap menu new boxes appear instead of old ones whiches are;

    From, PerpFrom, TanFrom, AlongL, AlongP, Between …

  9. tomas says:

    i have a problem.The Tollbar that is behind osnap toolbar has desapeared. (I mean toolbar that shows coordinates and Snap/Ortho/Planar/Osnap options desapeared). You know how to re show it? i dont want to reinstall rhinos.
    Can yo respond me to my email?

  10. lasith says:

    actually it’s very important may be some time we forget use that some osnap…………………………….

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