Page 1 Modeling a Sailboat: Hull / Background Images

Open boat1.3dm and save it out as boat.3dm on your local hard drive in a new subdirectory called boat.

Optional: To match your colors to the figures in this tutorial, call up Tools/Options... and click the Appearance tab. In the Colors section, click on the color swatch to the right of the words "Viewport background," and the Rhinoceros color picker window will open. Click on the Named Color labeled Dark Gray, and click OK.

Still working under the Appearance tab, click on the "Major grid line" swatch. In the color picker window, enter a Hue of 0, Sat of 0, and Val of 80, and click OK. Repeat to set the "Minor grid line" to the same color. Click OK to exit Options.

Click in the front view, and choose View/Zoom/Extents.

To bring in an image to sketch over, go to View/Background bitmap/Place and when prompted, locate the file boat/Background/sections.tga on the CD-ROM.

Turn on the osnap 'End.' Working in the Front window, click once in the upper left corner of the rectangle, and then click again in the bottom right of the rectangle. This will align the imported image with the spline guide, so that the boat you build will be at the same scale and position as the sample files on the CD-ROM.

After the second mouse-click, a dim gray figure will load into the background, as shown below.

Maximize the front view and study the blueprint that you have imported. The views of a model shown in blueprints are often drawn differently than the views in Rhinoceros modeling windows. The scanned-in blueprint shown in the Front view actually depicts more than one view in the same model: it shows the boat from the side, with curves from the front and rear views superimposed near the center. This one blueprint image will provide many of the design specifications required to model the boat. Note that no blueprint is ever perfect, and that your own creativity as a modeler will come in to play at several points during this tutorial.

In the layer control window, turn on layer annotate1.

The numbers 1-10 point to the top end of each of an important set of curves. These 10 curves are the "sections curves" of the blueprint. The section curves are the main curves that will be used later to loft the hull.

The section curves on the right (1-4) form the bow (the front end) and the sections on the left (5-10) form the rear of the boat.

Turn off the annotate1 layer. With end osnap off, trace over the lines 1-10 using InterpCrv (Curve/freeform/Interpolate Points). Note in the figure below that the curves being drawn can exceed the length of the section curves shown in the blueprint. These will be accurately trimmed off later.

Also note that lines 5 and 6 are similar in position, and may appear to be almost the same line. Carefully trace both of them.

In addition to the 10 numbered section curves, also draw a "centerline" straight down the middle, as shown below.

Save your file when done drawing all 11 curves.