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Setting cursor constraints

From: Rhino 4 Essential Training

Video: Setting cursor constraints

In this video, we will review what's called cursor constraints. These are simply modeling aids using keyboard shortcuts, for which no button or menu selection is provided. They are used in conjunction with Osnaps and are typically done dynamically, which means during a middle of the command, such as drawing a line or even moving an object. I am going to start work on the Front viewport, and I am going to focus on this neck. Go ahead and maximizes this by double-clicking on the name. I have got a change order here for completing this neck detail, so they can Revolve it later.

Setting cursor constraints

In this video, we will review what's called cursor constraints. These are simply modeling aids using keyboard shortcuts, for which no button or menu selection is provided. They are used in conjunction with Osnaps and are typically done dynamically, which means during a middle of the command, such as drawing a line or even moving an object. I am going to start work on the Front viewport, and I am going to focus on this neck. Go ahead and maximizes this by double-clicking on the name. I have got a change order here for completing this neck detail, so they can Revolve it later.

It needs to align with the edge of the head for some reason. So, I need to actually take that angle and somehow project it down below and that would be the edge of this flange. So, what I will do is I will start drawing a polyline. I have got the End snap on. Let's verify that. So, I will just start from the top. Now, before I click on the bottom, I am going to hit the Tab key. And basically, that's going to let us continue drawing from that same angle.

And I am not going to click til I get past this point of intersection here. Click and then right-click to enter. So, that's now just a construction line, but it matches the angle of the head. Let's go ahead and draw the other construction geometry. So, we will turn the Smart Track back on to save a little bit of time, and the Intersection. This will just be a very simple polyline. So, we will start by clicking on the intersection of that construction line. Going up, but I am going to take a peek over here and come back without clicking.

So, hold down the Shift key, so that's aligned those two up, and I snap to the end. Just double check our work here in Perspective, by double-clicking here and double-clicking on Perspective. So, now we can see we have aligned this neck flange with the exact angle duplicated from the head. So, you can go ahead and delete that. Lot of times you make construction geometry just for purposes like that, aligning things.

I am going to kind of work ahead here and just pick these curves and use the Join command. So we can see what it looks like when it is finished in 3D. So, this will be a Revolve from the Surface menu, and we just pick two points on an axis to revolve. And I will just click the FullCircle option. All right, very nice neck detail. I have to agree with that one. Next up, we will talk about the Elevator mode, which uses the Ctrl key.

This is best used in the Perspective Viewport and allows vertical or off the construction plane alignment. The key here is it is vertical, going away from the construction plane, either perpendicular up or perpendicular down. I am going to draw a line from one of the corners, over here on the body and go straight down. There is nothing to snap to, and I am off the construction plane. So, that's where this command will come in very handy. I am going to select another polyline. I am going to find the intersection there, but now if I want to go down vertically, there is nothing to snap to.

So, this is a little bit of a trick. I am going to hit the Ctrl key, go back up and snap to myself. Now, the next point I select is going to be perpendicular, and so you click to accept. Let's try that with a Move command. I'll turn Smart Track off. Come around here, and I just noticed that my nose is out of position. It is overlapping the mouth. I am going to do a Transform move and use the Ctrl key Elevator mode to get this up vertically.

I am going to select the nose, go to the Transform move. I am going to snap to the endpoint. Now, with nothing to snap to, I am going to use that same trick, hit Ctrl, click on myself actually, the endpoint there, and then go up vertically. Now, I don't like the line. I probably want to type in an exact number. So, dynamic display is telling me how far I have moved, but my robot boss has indicated 5.5 is the correct dimension.

So, these two cursor constraints are very handy little tricks that will make your modeling work go a lot faster but have the added benefit of working best in the Perspective viewport. The reason that is important is twofold. For one, a complex model can make some Osnaps difficult to use just from one Ortho viewport. Number two, they work especially well in the Perspective viewport, which I personally recommend spending the majority of your modeling time using, since it will give you the best real-world approximation of what your model will ultimately look like.

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This video is part of

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Rhino 4 Essential Training

67 video lessons · 16849 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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