On Jul 22, 2015, at 1:14 PM, Gurwinder Singh Bains <gswithba...@gmail.com> wrote:
> Hi Sean, > I'm working elliptical torus, export it but not properly. I want some > discission on as below: > In mged, after running "make eto eto" when I type "l eto" it shows results as If you run “sed eto”, it should show letters on the eto. (Run “reject” when you are done.) There is also a little bit of detail on page 263 of http://brlcad.org/w/images/c/cf/Introduction_to_MGED.pdf > Elliptical Torus eto > V (0, 0, 0) > N=(0, 0, 1) > C=(100, 0, 100) mag=141.121 > r=400 > d=50 > > here C is the major axis of the ellipse and D is Elliptical semi-minor axis. Yes. > How it is using ellipse for torus? A torus is defined by an ellipse being swept/rotated along a circular path. An elliptical torus is defined by an ellipse (a 2D shape) with a vector C — and the d value determines how wide/skinny it is. > Why vector is required for major axis and for minor it requires magnitude? We need only one vector to orient the ellipse. The other axis (the semi-minor axis) must be orthogonal to C, and that is easily calculated. We just need to know how long that orthogonal vector is, and that’s the ‘d’ value. Cheers! Sean ------------------------------------------------------------------------------ _______________________________________________ BRL-CAD Developer mailing list brlcad-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/brlcad-devel
