Visose, I like your solution. Definitely more useful. The smaller and simpler the definition, the better.
Also, I didn't know you could use the panel to pass formulas into functions. That's a good trick. Thanks. -Chris On Jan 3, 5:58 pm, visose <[email protected]> wrote: > Hi, here's an alternative > solution:http://grasshopper3d.googlegroups.com/web/cullpointswithregion.jpg > This method allows for any shape to be used as a culling region. The > previous method, although it works for this specific case, suffers > from several shortcomings. For example, if one of the curves > intersects one of the ZY planes twice it breaks, there's no horizontal > culling. > The drawback is that you need a closed curve, so you'll have to add a > couple of lines connecting the ones you already have. > > On Jan 3, 6:15 pm, dingle <[email protected]> wrote: > > > > > Spectacular. Simple and works perfectly. Thanks man! > > > On Jan 3, 4:43 pm, Chris Wilkins <[email protected]> wrote: > > > > Hi Dingle, > > > > I've got a simple solution worked up. I've uploaded the definition > > > file and the Rhino file in a zipped folder: > > > >http://groups.google.com/group/grasshopper3d/web/CullPointsOutsideBou... > > > > And a couple screen shots: > > > >http://groups.google.com/group/grasshopper3d/web/CullPointsOutsideBou...... > > > > This is just creating a YZ plane at each point and intersecting this > > > plane with the two boundary > > > curves, to get two more points for each of the original points. Then > > > it compares > > > the y-coordinates of the original points (which are randomly placed in > > > my example, but will > > > work the same for your grid of points). If the y-value is less than > > > the upper boundary and > > > greater than the lower boundary y-value, then it culls based on this. > > > > Hope that works for you, > > > Chris > > > > On Jan 2, 1:28 pm, dingle <[email protected]> wrote: > > > > > hi all, > > > > new to grasshopper, no stranger to rhino. i manually created a non- > > > > rectangular point grid and i'm seeking to get rid of all of the points > > > > which lie outside (actually, above and below) two arbitrary curves. > > > > the curves are more or less parallel to the x-axis, so maybe we could > > > > do something like subtracting the deviations between them and a line > > > > along the x-axis? > > > > i think i could script my way around this but would love to keep it in > > > > grasshopper... > > > > try these images (hope i uploaded them correctly): > > > > >http://groups.google.com/group/grasshopper3d/web/pointgridcrvbound_01...... > > > > > thanks all > > > > dingle- Hide quoted text - > > - Show quoted text -
