It's almost correct anyway. If you draw a circle or Arc with Rhino, it will be a proper circle or arc. It will be stored inside the *.3dm file as a plane with a radius. However, as soon as you modify control-points, or apply a transformation to a circle which would deform it, rhino converts the circle into a nurbs curve.
Because the parametric data behind circles, arcs and lines is so easily destroyed, I chose not to allow grasshopper to rely on those curve types. That may have been a mistake, but as has been pointed out by Visose, you can use a regular curve parameter, and as long as the curves inside are arc-like (they don't even have to be real arcs, nurbs curves that look like arcs will also work), the arc parameter will have no problem converting them. Incidentally, this is explained in the helpfile topics for Circle, Arc and Line parameters. Just double click the Circle parameter on the toolbar or open the helpfile through the menu on any active circle parameter. -- David Rutten [email protected] Robert McNeel & Associates Poprad, Slovakia On Jan 15, 5:56 pm, Chris Wilkins <[email protected]> wrote: > Thanks visose. That makes complete sense. > > -Chris > > On Jan 15, 11:34 am, visose <[email protected]> wrote: > > > > > They don't because there is no rhino object that is 'circle'. Once you > > place a circle in rhino using the circle command, it becomes a nurb > > curve. Still, it's able to detect if a nurb curve has the shape of a > > circle. So you can use the curve component to link the circle created > > in rhino and then connect a circle component to the curve component. > > I may be wrong here, but if i remember correctly the different > > 'native' geometry objects that rhino saves to a document are: > > points, polylines, nurb curves, nurbs surfaces, polysurfaces, > > meshes.... i think that's it. > > > On Jan 15, 3:54 pm, Chris Wilkins <[email protected]> wrote: > > > > Some of the GH parameters appear to accept existing geometries in > > > Rhino (such as Curve and Point), while others do not (such as Line and > > > Circle). Is there something I've overlooked? I just drew a bunch of > > > circles and tried to set a list of circles, but had to retrace each of > > > the circles. I could just use the curve parameter, but I'm not trying > > > to solve any particluar problem right now - I'm just trying to > > > understand why it is that way. > > > > Here's a picture of which parameters behave which > > > way:http://groups.google.com/group/grasshopper3d/web/ParameterQuestion.jp... > > > > I can see why the Vector parameter would be that way, since I don't > > > think there is a Rhino geometry equivalent, but otherwise I'm not sure > > > for things like Circle and Line parameters. > > > > Thanks, > > > Chris- Hide quoted text - > > > - Show quoted text -- Hide quoted text - > > - Show quoted text -
