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From: Tom MacNaughton
Date: 10 May 2008
Time: 13:37:23 -0400
Remote Name: 66.252.37.116
I may not be understanding either Joe or Brian, but here is how I develop diagonals in Rhino: In the Right View I draw the straight lines as close to normal to the surfaces as I can. Sometimes I do as many as three sets of diagonals to develop or analyze different portions of the hull. If you are working only with preliminary sections to develop a Curve Network you can then create a point running the cursor down the section until the Int Snap pulls it to the diagonal. Then you click to place the point there and you can create a diagonal through all the points you've created using the Curve > Interpolate Points command sequence. If you are working with surfaces or solids you can stay in the Right View and use the Curve > From Objects > Project command sequence to project the straight line onto the hull surface in which case you get the diagonal curve. These diagonals can be analyzed and examined in context on the hull. They can also be copied and rotated to arrange them in an orthographic drawing as in conventional drafting. One of the reasons Rhino is so effective at producing really excellent hull lines is that it is so easy to create really superior diagonals. Working back and forth between sections and diagonals to develop the hull shape and only using waterlines and buttock lines as a check is the best way to get really superior hull lines and is one of the principle reasons that we have always had such good luck with our designs.