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Building rectangles and polygons

From: Rhino 4 Essential Training

Video: Building rectangles and polygons

In this video, we'll explore the use of Rhino's preprogrammed 2d shapes, focusing on the polygons. The generation of these shapes is very similar to building them manually, except that Rhino automates their creation by combining every option into a single command. For example, a square might require steps for each side, a join and then a move to get it centered. The preprogrammed square does it all in one command. Since this instructor is recommending that you build 2D curves first and then generate surface through solids second, your familiarity with the range of Rhinos built-in 2D shapes is a huge boost for both accuracy and productivity.

Building rectangles and polygons

In this video, we'll explore the use of Rhino's preprogrammed 2d shapes, focusing on the polygons. The generation of these shapes is very similar to building them manually, except that Rhino automates their creation by combining every option into a single command. For example, a square might require steps for each side, a join and then a move to get it centered. The preprogrammed square does it all in one command. Since this instructor is recommending that you build 2D curves first and then generate surface through solids second, your familiarity with the range of Rhinos built-in 2D shapes is a huge boost for both accuracy and productivity.

Fortunately, they are all extremely well- labeled and organized. So, let's begin. I'm going to go ahead and maximize the Top viewport by double-clicking on its label, so we'll do most of the work there. For the first example, I'm going to the Curve menu > Rectangle and just draw a simple Corner to Corner. First click is one corner: second click is the opposite. Let's try to do that again with a little more accuracy. So, I'm going to repeat the command by using a right-click anywhere.

I'm going to select one corner. Now before I picked the second one, let's use the numeric input to get more accuracy here. I'm going to go ahead and type in a width of 15. Now check the cursor. It is constrained to that 15-unit width, and it is waiting for the other dimension. So, I'm going to go ahead and type in 25, and there is now a rectangle. It is exactly 15 x 25 units. I'm going to try this command one more time to show you a really nice option.

I'm going to right-click and before I start, I'm going to go ahead and pick the Center and Rounded, two options that will save a huge amount of time. So, now we can click on a point, and that is the center of the geometry. I can type in numbers, but for this example, I'm just going to click randomly. Now as I move, it's automatically generating Fillets on all four corners and with this feedback, I can tell exactly how big the are, so I can click anywhere to eyeball it or type in an exact number with the keyboard 4 and get a four unit radii on all four corners.

Let's switch to Polygon. You'll find these on the Curve > Polygon. I'll just pick the first one, Center, Radius. I'm going to try a 8 sided polygon or hexagon, so I'm going to select 8 and just draw it here anywhere. Notice it comes out to one of the vertexes. So, if I hold down the Shift key, it will go out to 90 degrees or up at 90 degrees, but I may want to have that flat edge facing the 90 degrees.

So, let's try the next option, right-click to repeat. We're going to select Circumscribed. So, I'm going to pick a point anywhere here. Now as I come away, it is in the center of the edge. If I hold down the Shift key to make it Ortho, it keeps it 90 degrees. Okay. Let's try a Polygon that's shaped like a star, Curve > Polygon > Star. I'm going to change the Number of Sides here to make something a little more interesting.

Let's go ahead and double that to 16. So, I'm going to just select an empty spot for the center and we have an option for two different radii. We have the Corner, and the next click will be the inside of that Star, so that's a lot of lines and a huge timesaver. I'm going to go back and switch to the Perspective viewport by double-clicking on the Top view and just double- clicking on the Perspective viewport. I want to start the Polygon command one more time. Curve > Polygon > Center, Radius and let's take a look at some of these options here.

We've changed the Number of Sides. We know what Circumscribed is. Let's try the AroundCurve option and see what happens. First, we're going to select one of these curves. We're going to pick a point at random to start the Center of the polygon. That is now centered on an angled curve and drawn exactly perpendicular. Let's try it on a curved line and repeat the command with a right-click. Let's go back to maybe 8 sides, select the AroundCurve option, so I can place it anywhere along here.

I've got a point that happens to be there so I'm going to snap to that. Come out. I can now type in a radius. 8 Sides is okay. Click to accept, so there are two polygons drawn Around Curves but perfectly perpendicular. The huge variety of shapes are powerful and yet pretty darn easy to use, but too often people, forget all of the great options because they don't look at the Command line. In the case of the rectangle command, it's especially helpful to center the shape and then round all four corners at once.

Show transcript

This video is part of

Image for Rhino 4 Essential Training
Rhino 4 Essential Training

67 video lessons · 16838 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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