That grid, which looks curved, is actually made up of a series of straight grid columns. It appears curved, since I slightly varied the degree of each grid column as I added it to the previous one.

I try and explain this process, which is the most difficult of this project, in the section titled “Using the vanishing point filter – extending the original plane.” Basically, each time you extend the original plane you have to do two things:

1) Extend the plane only a little bit. Each extension will be only a small part of your entire grid.
2) For each extension adjust the angle of the extension to follow the contour you are interested in (this is what will create the illusion of a curve).

You can change the angle of the plane extension you are working with using the “Angle” pull down menu. I find clicking on the pull down and then using the arrow keys to adjust easier than using my mouse to change the angle.

This image shows as I create the plane extension that begins the curve around the jar:
http://netlumination.com/wp-content/uploads/2009/05/pull-out1.jpg

Best of luck and patience,
Peter.