Problem with railsweeps along a curve

Rhino Rhino for Mac
1

Hi Everyone,

I am trying to do a rail sweep along a curve. The shape transitions from square with slightly rounded corners to square but when i use closed sweep it shows wobbles in the corners and issues on the sides.

Here are some screen shots showing what is happening.

I am new to Rhino so any help gratefully recieved,

Cheers.

.

Screen Shot 2016-01-26 at 16.56.04.png2560Ă—1440 650 KB

Screen Shot 2016-01-26 at 16.57.28.png2560Ă—1440 434 KB

2

You will probably have to attach the 3dm file so that people can take a look.
Up front, though, it looks like those surfaces are way way way overdefined. My guess just from looking at this is that it will be hard to get anything clean out of this…

3

Thanks for the reply, could you elaborate on way way way overdefined? This is the first time i have started using surfaces.

Any advice on achieving these rail sweeps would be much appreciated.

4

Can you post the file?
The overdefined comment refers to all the isocurves that are drawn on the surfaces in the images.

5

Thanks again Wim, really appreciate the input, as i said it’s the first time i have worked with surfaces so used the curve network tool to get these surfaces. Maybe this was the wrong tool to use? I am unable to post the file as it is a design that i have to protect but i could make up a file showing just this problem area if that might help at all.

The other surfaces seem ok after i render them, just this particular area i am struggling with.

6

Square to round Transition…3dm (64.8 KB)

Here is the file for the area that I am struggling with, i managed to put a surface on to the 10 sections starting at the round end by 2 rail sweep tool but after that point is where it seems to go wrong.

7

Hello simonms,

Is this conceptually what you’re looking for?

8

Hi OSTexo,

Yes, that’s right but along my specific dims. Essentially a square to round transition along a curve.

9

Hi simonms,

I took your file and deleted the stuff you don’t need for the sweep2. I also joined some curves together.

Is this what you’re after?

Square to circle.JPG864Ă—670 34.3 KB

Square to round Transition.3dm (222.3 KB)

1 Like
10

Since you have the center points, why not use it to make a curve using InterpCrv?
And then use the curve to do Sweep1 the first joined square and end circle.
Square to round Transition_sweep1.3dm (142.4 KB)

11

Forgot to thanks everyone for there help, all done so thanks!