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Incorporating the Osnap modeling aid into your workflow

From: Rhino 4 Essential Training

Video: Incorporating the Osnap modeling aid into your workflow

In the fourth of Rhino's primary modeling aids, we'll review the most important one, the Osnap or Object Snap. I've mentioned that the goal is to make our curves clean and accurate. So, by far, the best way to do that is by using the Osnap. Yes, there are 10 different settings we can use, but fortunately they are all clearly and intuitively labeled. Even better, you should only need to use a few at any one time during the course of your work. So, I'm going to be working on this robot's neck and I'm going to explore couple of different design options by building construction or practice curves.

Incorporating the Osnap modeling aid into your workflow

In the fourth of Rhino's primary modeling aids, we'll review the most important one, the Osnap or Object Snap. I've mentioned that the goal is to make our curves clean and accurate. So, by far, the best way to do that is by using the Osnap. Yes, there are 10 different settings we can use, but fortunately they are all clearly and intuitively labeled. Even better, you should only need to use a few at any one time during the course of your work. So, I'm going to be working on this robot's neck and I'm going to explore couple of different design options by building construction or practice curves.

We'll actually pick the final design later and trim and join the curves together. Another note, these Osnaps will work on any kind of geometry, which includes curves, surfaces or edges of solids. But for this chapter, we'll stay focused primarily on curves with maybe one snap to a surface at the very end. Our Osnap toggle is located here at the bottom. I'm going to go ahead and click on it and here's all the options. Now this is so critical. I'm going to keep this open and dock it, so I grab the title nar there, move it towards one of the four sides, and you can position it.

Now if you are counting, you would notice there are ten different types of Object Snaps. End point, Near, Regular point, Mid point, Center point, etcetera. However, the last three are more like settings for the snaps. We have Project, Smart Track, and Disable, but probably an easier way to disable is just by hitting the shortcut Alt key in the middle of a snap. Let's start by drawing a line using the End and Center snap.

So, I'm going to click on End to activate that, and Center. I'm going to maximize the Front viewport, double-click on the label, and I'm also going to turn off the Grid here. So, it's little less clutter. That's the F7 shortcut key. I'm going to draw a Polyline and just draw it from one of the end points. I'm going to zoom in here a bit and notice how it jumps to the center of the circle but not when I'm in the center. Only when I'm close to the edge.

It's actually for your benefit, because if you have a lot of circles close together, you may pick the wrong center point. So, by selecting the center by going to one of the edges, it jumps to the mathematical center for you. Okay let's draw another line with two different Osnaps. I'm going to pan out, turn off End. Turn on Mid. So, you should have only Mid point and only Perpendicular. Start the Polyline command one more time, and I'm going to just kind of eyeball the center of this.

Make sure you see the word pop up anytime you do an Osnap, so it says Mid, and I can now click safely, and it's exactly on the line, and coming over to the center line here, and there is the perpendicular. So, that line is now exactly touching from one side at a midpoint and on the other side to an exact 90 degree perpendicular. Let's try another two options. I'm going to turn those two off. And we are going to go from Point object to a Tangent. Another Polyline, so here is a Point object here.

So, we are going to get close so that Rhino can determine where that tangent is. So, we actually have two locations of tangent on any circle. We can go to either side, and then you click to accept. I'm going to turn those two Osnaps off and try another set. This will be using the Int for intersection and my least favorite Osnap, the Near, which is very handy but also very dangerous and I'll show you why.

I'm going to go ahead and start the Polyline and let it find the intersection. That's pretty handy and now it's drawing a Near snap to anywhere along that curve. So, it's exactly going to touch, but it's not that accurate as far as the angle or if it's perpendicular. So, that's the good part of the Near. Here's the bad part. A lot of times people forget, leave this on, and they end up with a lot of inaccuracies in their file. They think they are snapping to an End point or Midpoint, when it's actually using Near and just getting kind of close.

So, be careful. If you use Near you want to turn that off pretty quickly. So, for the last Osnap example, I'm going to turn on Knot and Quadrant. So, a Knot is just a factor of surface geometry where there is a seam or an edge. Go ahead and draw the Polyline, and we'll click to the tip of this cone, and there it found the seam at the top. And then we'll go back to the circle here in the middle and notice that since it was drawn correctly it's got quadrants at four different intervals.

Finally, I'd like to show you some of these same settings available inside geometry. Go to the Curve menu, select Line, and then select Tangent to 2 Curves. So, here we can draw a curve and have it be tangent to two other curves, and not have to worry about the snaps at all. Reading the command line, I'm going to select the first curve near where I want it to be tangent, and then the second curve, and it calculates the solution.

Take a look at all of the many types of lines here. You might want to explore this a little bit further because there are a lot of options to draw accurate curves from a lot of different situations. The use of Osnap is critical to the creation of simple and clean lines. In fact, you will probably lose all accuracy without Osnaps, and since we are building surfaces from most of these curves, it becomes even more important to get the curves just right. Even if you are building quick study models it's still worth the effort to slow down just a little bit and use your Osnaps.

A few seconds here and there as you are designing and building can save many hours of problems towards the end of a project.

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This video is part of

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Rhino 4 Essential Training

67 video lessons · 16841 viewers

Dave Schultze
Author

 
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  1. 4m 13s
    1. Welcome
      1m 1s
    2. Using the exercise files
      28s
    3. Recommended hardware
      2m 44s
  2. 19m 8s
    1. Understanding the three types of entities: curves, surfaces, and solids
      5m 51s
    2. Comparing Bezier curves, B-splines, and NURBS objects
      3m 35s
    3. Comparing isocurve surfaces and mesh surfaces
      4m 50s
    4. Setting measurement units and tolerance
      4m 52s
  3. 18m 16s
    1. Introducing the viewport
      3m 20s
    2. Using construction planes to anchor model design
      5m 27s
    3. Changing the way a model is viewed using shading modes
      3m 11s
    4. Navigating the viewport with pan, zoom, rotate, and reset controls
      3m 24s
    5. Exploring help options
      2m 54s
  4. 29m 48s
    1. Understanding Rhino's command philosophy
      3m 10s
    2. Using toolbars and docking buttons to a toolbar
      3m 33s
    3. Navigating the geometry menus using a "department store" analogy
      3m 35s
    4. Using the command line and status bar to get feedback
      4m 56s
    5. Modifying the nudge control and setting other preferences
      6m 54s
    6. Using the Properties window
      3m 1s
    7. Opening and saving files
      4m 39s
  5. 14m 24s
    1. Creating basic objects: curves, surfaces, and solids
      4m 22s
    2. Performing basic transformations
      3m 14s
    3. Selecting objects
      3m 37s
    4. Organizing a project using layers
      3m 11s
  6. 21m 18s
    1. Understanding lines and polylines
      4m 10s
    2. Building rectangles and polygons
      5m 12s
    3. Creating arcs, circles, and ellipses
      7m 8s
    4. Drawing freeform curves
      4m 48s
  7. 47m 36s
    1. Comparing different types of 3D surfaces
      7m 11s
    2. Extruding surfaces to create features in a model
      8m 58s
    3. Creating surfaces with lofts
      7m 49s
    4. Using Revolve and Rail Revolve to create surfaces
      7m 42s
    5. Using Sweep Rail to create a 3D claw
      7m 49s
    6. Creating complex surface shapes using Network Surface
      8m 7s
  8. 46m 48s
    1. Introducing solids
      5m 42s
    2. Making solids with primitives
      5m 41s
    3. Extruding curves to create solids without primitives
      8m 59s
    4. Creating unique shapes with the union, difference, and intersection Boolean operators
      6m 46s
    5. Troubleshooting solids and Booleans
      8m 53s
    6. Editing with the solid edit tools
      6m 20s
    7. Creating and transforming holes in solids
      4m 27s
  9. 27m 8s
    1. Understanding Rhino's modeling aids
      3m 59s
    2. Working with the Grid Snap modeling aid
      2m 22s
    3. Using the Ortho modeling aid
      3m 4s
    4. Using the Planar modeling aid
      2m 4s
    5. Incorporating the Osnap modeling aid into your workflow
      6m 7s
    6. Understanding the Project and Smart Track modeling aids
      4m 42s
    7. Setting cursor constraints
      4m 50s
  10. 50m 14s
    1. Editing corners with Fillet and Chamfer
      7m 38s
    2. Trimming and splitting with curve Booleans
      5m 37s
    3. Moving and rotating objects with the Drag and Nudge tools
      7m 24s
    4. Copying and pasting objects
      4m 10s
    5. Understanding how Rhino uses Undo and Redo
      3m 42s
    6. Grouping objects
      3m 21s
    7. Scaling objects
      6m 40s
    8. Duplicating objects using the Mirror command
      6m 36s
    9. Making copies and structured sets using arrays
      5m 6s
  11. 20m 37s
    1. Using the Analysis toolbar to understand characteristics of a model
      6m 14s
    2. Defining degrees of curve and surfaces
      6m 6s
    3. Using Rebuild and Change Degree
      8m 17s
  12. 26m 21s
    1. Measuring and labeling values on a model using dimensioning
      5m 22s
    2. Creating screen captures for quick proofs
      5m 16s
    3. Creating 2D views of a 3D model
      6m 44s
    4. Rendering a project
      8m 59s
  13. 22m 5s
    1. Preparing a model for prototyping by confirming that all gaps are closed
      5m 17s
    2. Using the "shelling" technique to create wall thickness
      10m 54s
    3. Exporting to the STL format for 3D printing
      5m 54s
  14. 14s
    1. Goodbye
      14s

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