Please don't translate or copy these tutorials elsewhere. I don't like the tutorials to float around in 10 different versions and places on the net. Feel free to link to this page of course! (see also Terms of Use)

This is a free tutorial! Please click on the Paypal donate button if you want to support this site and help me creating new tutorials.

If you discovered this Rhinoceros 3D tutorial page through a direct link or search engine, please note that you're on page 3 of the tutorial! Please complete the previous page first if you haven't done so.

We will scale this curve using scale2D.

As start point, choose a point +- in the middle of the curve, using grid snap to snap to the X-axis.

Turn on "copy=yes" (like we did with the rotate command)

The second click should also be on the X-axis, to the right and outside of the curve.

Then by dragging you will see the curve getting smaller. Drag until your curve looks something like the red one in the image.

Perspective view:

Now we will draw two lines which will be used as cross sections in a 2 rail sweep.

Draw a line with end and int snap turned on. You can do this in perspective view. Click on the point as in the image:

Then click here:

This is our first line.

Do exaxtly the same on the other side so you'll have this.

It's very important to use the object snaps!!!

Now go to 'surface---sweep 2 rails'. You need to select the rail curves: select the scaled curve and the edge of our surface. Then you need to select the cross section curves: select the two small straight lines we just created in the previous steps. Press enter.

A dialog box will pop up with some options. Check the 'closed sweep' option and press ok. The sweep will be created.

In right view it looks like this:

I find this a bit too sharp.

I pressed undo several times to get back to the point before I did the sweep two rails.

Turn on control points for the two straight lines and select the bottom points and the bottom curve and move them all a bit lower in front view.

Now you need to do the two rail sweep again.

This is the result:

Select the sweep surface and the top surface and press the join button.