Hi David/Justin, my study about the curve. I donnt know it's match you thinking.... http://groups.google.com/group/grasshopper3d/web/parameteric_curve2.ghx
On 4月10日, 上午5时38分, David Rutten <[email protected]> wrote: > My point was that a parameteric description does not feature any > numbers, since they are parameters and thus variable. > A parametric definition of the file I posted would be: > > http://groups.google.com/group/grasshopper3d/web/param_curve.png > > Where: > > A is given (a point) > B is given (a point) > v is given (a vertical vector) > C is the result of translating A along v for a certain distance > D is the result of translating C along v for a certain distance > E is the result of translating B along world-x for some distance and > along world-z for some distance > (1) is the line segment connecting A and C > (2) is the arc segment connecting B and E, having a tangent of v at B > t is the tangent at the end of (2) > F is the result of translating E along t for a certain distance > (3) is the nurbs curve with control points {C, D, F, E} > > no numbers, just relationships. > > -- > David Rutten > [email protected] > Robert McNeel & Associates > > On Apr 9, 9:58 pm, Justin <[email protected]> wrote: > > > Thanks David and Scott. The support for Grasshopper is really great. > > > Regarding the dimensions, the 7 and 13 are derived from the height of > > an adult and a child *2 + some thickness for the roof structure. > > Essentially "(Adult Height * 2) + Roof thickness" So I could have > > described it better. > > > Thanks again. > > > On Apr 9, 12:43 pm, David Rutten <[email protected]> wrote: > > > > ps. the image you posted does not actually describe a parametric > > > curve. You've posted dimensions, not the logic of how the curve is > > > constructed. Numbers like 7 and 13 have no business in a parametric > > > definition. > > > > -- > > > David Rutten > > > [email protected] > > > Robert McNeel & Associates > > > > On Apr 9, 9:41 pm, David Rutten <[email protected]> wrote: > > > > > So we have given locations for the start and end points of the curve, > > > > and a clear description of a vertical line segment and an arc with a > > > > vertical tangent. The wiggly curve in between however is still very > > > > undefined. > > > > > I uploaded a definition which consists of 3 curves; a vertical line, > > > > an arc and a 4pt nurbs curve which is tangent to both. Parameters are > > > > all derived from sliders, so you can fiddle with them in real-time: > > > > >http://groups.google.com/group/grasshopper3d/web/Parameteric_curve.zip > > > > > -- > > > > David Rutten > > > > [email protected] > > > > Robert McNeel & Associates
