Class Notes - Tuesday, Jan. 9th, 2001

Instructor: Darrek Rosen
More student works reviewed: Boaz Ashkenazy, Chelsea Klein, Chris Twigg, Russ Rotondi, Sean Smith, Kristopher Martin, Bradley Weikel, Ron Ygona

Darrek showed some of his own works over the past few years.

Then he went over the basics of modeling with curves, making surfaces with curves & working with related editing tools with several examples:

1. Sailboat example

2 ways of creating curves: CV's(control vertices) & editing points

Degree of curve: 1 for linear, 3 in most cases (higher degrees for more precise designs)

Grid snap some extra points at the end of the curve to ensure a smoother object.

Display>NURBS Components>CVs shows the CVs

Hot menu: hit RightMouseButton over the desired object

Loft & planar: make sure to grab curves in proper order

Attaching surfaces: Connect (preserves original shape) vs. Blend (smooth transition), sometimes need to reverse curve direction to prevent flip (Edit Curve>Reverse Curve Direction)

You are left with base curves, and these can be templated or put on a reference layer if youre no longer going to use them. When youre done with them, choose Edit>Delete History to delete the history on the object.

To edit CVs, hulls, isoparms, edges, etc, be sure that you are selecting components rather than object or hierarchies.

Edit Suface>Insert Isoparms will insert more isoparms in case more accurate control over the shape is needed. You can grab an existing isoparm (be sure to its selectable from the components menu), locate a duplicate of it, and then insert an isoparm.

Creating surface: Boundary (sail of the boat) vs. Square (for more elaborated designs)

2. Spoon, cup & fork

Start with a roughly correct shape, then refine it as you go along.

Deselect: hold down Shift when click+dragging

Intersecting & trimming surfaces

Use surface fillet for smooth transition between surfaces

To extrude, create the curve and then the path to extrude the curve along, (such as a circle extruded along a curve path will create a tube following the path). Grab the curve first and then the path to be extruded along, then Surfaces>Extrude.

Surface>Boundary will create a surface between boundary curves.

Edit Surface>Surface Fillet fillets between surfaces. Sometimes you have to give a negative fillet value.