David,
That makes sense. I did see the points -> vector magnitude
conversion, but for some reason it didn't think about the actual
sorting as a radial operation. That should qualify for partial
credit.
Multi-dimensional dataset sorting (after I played around with that
first) is clearly the tricky part, but I can see how it could be
readily scripted.
However, it seems like you might have your hands full for a while with
the new release (Thanks by the way).
taz
On Oct 10, 4:05 am, David Rutten <[EMAIL PROTECTED]> wrote:
> Taz,
>
> in the image you posted, this is what happens:
>
> The Keys input of the Sort component operates on numbers. You are
> providing a list of points. There is no data-translation defined
> internally for {Point->Number}, but there are translations for
> {Point->Vector} and {Vector->Number}. The first simply copies over the x, y
>
> and z values from a point into a vector, and the latter measures the
> length of the vector. So, in effect, when you feed points into a
> number parameter, what you actually end up with is a list of numbers
> (one for each point) that represent the distance from that point to
> the world origin (0,0,0). That is why your points have to be far away
> from the origin for this to work. If the point grid was near the
> origin, the points would have been sorted in concentric circles. If
> you're far away enough, these circles start to straighten out and
> their curvature will become smaller than the grid cell dimensions:
>
> http://grasshopper3d.googlegroups.com/web/ConcentricSortCircles.png?g...
>
> It would be technically possible to get a set of unordered points, a
> reference plane/surface and reverse engineer the grid from the
> projected {uv} coordinates. this is way more complicated that just
> linear sorting though. I'll have a look to see if I can some up with a
> reasonably watertight algorithm for this.
>
> --
> David Rutten
> Robert McNeel & Associates
>
> On Oct 10, 2:17 am, taz <[EMAIL PROTECTED]> wrote:
>
>
>
> > This is the easiest thing I could think to do.
>
> > I referenced the 144 points in by windowing all of them at once. And
> > then I let Grasshopper sort them.
>
> > The list of points (looking at the sorted output of the key values) is
> > sorted based on the distance from the origin to the point (or perhaps
> > the magnitude of a vector...).
>
> > To get a valid surface I had to shift all the points into the positive
> > quadrant and move them far enough away from the origin. The U value
> > is 12.
>
> > There must be a smarter way to sort points referenced points, but
> > David may have to chime in about that.
>
> >http://groups.google.com/group/grasshopper3d/web/srfgrid_pts.png
>
> > taz
>
> > On Oct 9, 5:59 pm, oompa_l <[EMAIL PROTECTED]> wrote:
>
> > > Hi Taz
>
> > > I just uploaded a file with some points
> > > :http://groups.google.com/group/grasshopper3d/web/some-points-01.3dm
>
> > > there's nothing particularly meaningful about them - I constrructed
> > > them for the purposes of this discussion. I was trying to tackle
> > > another problem and I had wanted to go parametric with my surface....
>
> > > thanks for the advice
> > > Gabe
>
> > > On Oct 8, 8:30 pm, taz <[EMAIL PROTECTED]> wrote:
>
> > > > Well, that's the simplest example but look at the order of the points
> > > > in the final list.
>
> > > > You'll have to wrangle (sort) your referenced points into something
> > > > similar (i.e. sort by x-coordinate, then y, z)
>
> > > > Post your points, or an example, if you want.
>
> > > > On Oct 8, 7:45 pm, oompa_l <[EMAIL PROTECTED]> wrote:
>
> > > > > yes, i guess that does help. I had hoped there was a way to use points
> > > > > that were already baked into the real model space as opposed to points
> > > > > assembled into a rectangular grid. You basically answered my question
> > > > > my suggesting that what I wanted to do is not possible, or should be
> > > > > done in a different way.
>
> > > > > thanks, sorry for the need to be hand-held...
>
> > > > > On Oct 8, 7:29 pm, taz <[EMAIL PROTECTED]> wrote:
>
> > > > > > oompa,
>
> > > > > > See if this helps:
>
> > > > > >http://groups.google.com/group/grasshopper3d/web/srfgrid_demo.png
>
> > > > > > taz
>
> > > > > > On Oct 8, 11:22 am, oompa_l <[EMAIL PROTECTED]> wrote:
>
> > > > > > > once I have my points, one for each uv position how do I do the
> > > > > > > "sorting"...and can they be sent to the SrfGrid component by a Pt
> > > > > > > component (which represents a list of points)? I know this seems
> > > > > > > elementary, but I'm not getting it...nor the surface.
>
> > > > > > > thanks- Hide quoted text -
>
> > > > > - Show quoted text -- Hide quoted text -
>
> > > - Show quoted text -- Hide quoted text -
>
> - Show quoted text -
