A non-random point on a NURBS surface

So...as usual, i have a newbie question. I would like to generate two points on these two surfaces, that i can than, move around within the surface boundaries. So i will need one point, let us say, in the middle of upper srf, that i'll than connect to the other one. I will than make a line which will be used to create e tunnel like vortex between two surfaces. All of this should be moving-friendly :) so i should suppose to move around the whole vortex. is this even possible? heheh
p.s. oh, and another thing, can i create a circle form that is on the surface, shaped like surface, without having to use project option?

Attachments:

Untitled.png, 73 KB

Replies to This Discussion

Permalink Reply by Chris Tietjen on November 11, 2011 at 7:15pm

If you move the frustrum around the holes and the tunnel will move with it. You could modify this so that you could move the tunnel by moving a point on the surface.

Chris

Attachments:

TunnelBetweenTwoSrfs.3dm, 54 KB
TunnelBetweenTwoSrfs.gh, 5 KB

Permalink Reply by Gogash on November 12, 2011 at 3:37am

I think this will totally do it man, thanks! One question though, if i was to fillet and round the corners of the upper surface and vortex one, how do i do it? there's only FILLET CURVE option. It's not like in Rhino, where you click the edge and you fillet, simply as that :)

Permalink Reply by Chris Tietjen on November 12, 2011 at 5:20am

Sweep2 instead of Loft.

Chris

Attachments:

TunnelBetweenTwoSrfsRev1.gh, 12 KB

Permalink Reply by Gogash on November 13, 2011 at 8:24am

sorry to bother you again....don't know why, but the last step (sweep2) doesn't seem to connect with the mesh one!? i opened it with the original files you gave me. tried disconnecting it and than connecting again, tried enabling and disabling the preview .... what could it be?

Permalink Reply by Chris Tietjen on November 13, 2011 at 9:49am

The mesh component is there just to give a smoother display in GH. I don't know why it won't connect. You don't really need it. Leave it disconnected and turn on Preview in the Sweep2 component and the in the two Surf parameter components further upstream.

Chris

Permalink Reply by Gogash on November 20, 2011 at 8:01am

ok so i finally got it, the problem was that the surfaces were too much deformed :( that would be a problem in my case since i really need to work with some crazy curved surfaces :) i move some srf point around to see what happens, but didn't got to know why sometimes it sweeps2 sometimes it doesn't. the strange thing is that all other geometries are formed normally: there are two ellipse curves, there's a line connecting them.... so why won't it sweep damn it !?!

Permalink Reply by Chris Tietjen on November 20, 2011 at 3:57pm

I've also noticed that Sweep2 is not always reliable and I don't know why.

Permalink Reply by Yoann Mescam (Systemiq) on November 20, 2011 at 5:01pm

http://www.grasshopper3d.com/xn/detail/2985220:Comment:217603

Can fix some problems, but its still annoying that Sweep2 would need this workaround.

Permalink Reply by fernando molas garcia on November 20, 2011 at 5:55pm

Hello chris

Playing around with your algorithm it occurred to me get some things and not know why notGenra sweep2 curve.

what is the problem?

regards

Attachments:

sweep2 + mesh.gh, 10 KB

Permalink Reply by Gogash on February 18, 2012 at 12:48am

from my experience i noticed that the two surfaces need to be right curvature, not only but they shouldn't be intersected or at the same level. so try that...

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