当你生成一个渐变网格物体时，这几条线叫网格线，在网格线间相交的点叫网格点(除此以外的点叫节点)，四个点围成的面积叫网格面片。本教程专门介绍渐层网格工具的使用，以一个例子展开讲解。
Make a sack with the Pen Tool or the Pencil Tool.
Go to Object > Create Gradient Mesh. Use the settings in the picture.
Select the Mesh Tool. Select a anchor point with the Mesh Tool.
When you have selected an anchor point with the Mesh Tool, pick a darker color.
Use the Mesh Tool on more anchor points like in the pictures.
Pick now a light color for the highlights.
Do it with more.
Make a sack with the Pen Tool or the Pencil Tool.
Go to Object > Create Gradient Mesh. Use the settings in the picture.
Select the Mesh Tool. Select a anchor point with the Mesh Tool.
When you have selected an anchor point with the Mesh Tool, pick a darker color.
Use the Mesh Tool on more anchor points like in the pictures.
Pick now a light color for the highlights.
Do it with more.