Is it possible to do a 3D sweep?

[nathanl]

I am trying to use a void to create a beveled arch within a curved wall. I have tried using a sweep, with pick path in a 3D view and I always get the error "Cannot create sweep". Is it possible to create a sweep in Revit with a 3D path?

[hand471037]

It is, but you have to careful abou the sweep 'wrapping back' on itself. If it overlaps itself too much at a corner, it will fail in it's creation. it 'kinks'. so it's probably not your path, but your profile. You might have to create it as a series of sweeps, or if the profile is in the right spot, move the path so that the sweep is not overlapping itself.

[papurajx]

A Picture answer your question...I think.

[Tobie]

but if you now try and do a sweep with the path as the top edge it will not work, not for me anyway.
is that the sort of sweep you where talking about nathan?
sorry i have no answers.
cheers,

[sbrown]

You can usually use pick to make a 3d sweep. IF not frame out your path with model lines first, then pick those lines. start with a simple square to make sure its not the profile, then swap out with the profile you want.

[papurajx]

Please draw a couple of Reference planes ar the top and bottom with required angle and attach the wall to the top and bottom of the reference plnes. This would appear as tough the wall is swept along 3D path

[Tobie]

if you draw line to define the 3D curve Revit places the line on a reference plane, therefore it is not 3D any more. i wanted to sweep a profile on the top edge of the wall that has a 3D curve. the problem is not in the profile as i tried all variations inc. loaded profiles.

[sbrown]

Compound curves are tough, I use an extrusion in plan that follows the plan curve, then a void in elevation to cut that extrusion to follow the elevation curve. Note though the line method I described works and creates 3d sweeps, you need to however set a ref plane on an angle then draw the curve in plan with that ref plane selected as the work plane. then your sweep will follow that.

[Tobie]

drawing a line on a reference plane is not a 3D curve, the reference plane is always "flat". i have told the guys in the office that it is sometimes a good thing not to be able to do too complex shapes. if it is difficult to model in Revit it will be difficult to build.
cheers.

[mmodernc]

Has anybody checked out the RIBA website to see what's winning the prizes?

[eddy.lermytte]

Xavier
In what release did you make the compound curve ?

[sbrown]

Thats in 8.1but I believe it is using the same extrusion void solutions that I was using.

[Tobie]

it is still not a 3D sweep. the path needs to change in 3 planes (X,Y,Z) a 3D sweep would be if you could sweep the edge after you cut the void from the curved wall. Revit 8.0 can do example too.
cheers.

[beegee]

A 3D sweep in 8.0 like this ?

[Simon.Whitbread]

Are you using that as a Beta version, or should we be expecting a CD very shortly?


Thats in 8.1but I believe it is using the same extrusion void solutions that I was using.

[sbrown]

Everything shown here can be done in 8.0.

[Andre Baros]

Yes Revit can sweeps along any plane, but it cannot do 3D sweeps. There are work arounds but no solutions for true 3D sweep situations.

[Matt Brennan]

I don’t know if this will answer you question but in the new version of Revit Building 8.1, you can now Import NURBS (Non-Rational Uniform B-Splines). This allows you to reuse digital design data from other Applications inside Revit Building. Nurb surfaces from DWG or SAT files will work to. From these surfaces, you will be able to create roofs and curtain systems by picking the faces. This is the same functionally of the built in Revit Building maker tool but It has now been enhanced.