TIPS!Prior Learning Adobe Illustrator, you should really - really have advanced basic Photoshop and Coreldraw
Which is not often used but important in the manufacture of strokes in Adobe Illustrator vector is the Mesh tool. Usefulness is to produce a gradation in the vector image.
The following will be on show you how to use mesh tool:
1. First create a shape path (according to form the desired free).
2. After the object (path) so, then select the mesh tool, then click the mesh tool several times on the object so as to produce the dots and help lines.

