在表面上，使用钢笔工具绘制一个如下图一样包围侧板的路径。

For the surface, pick the Pen Tool and draw a path around the side panel as shown in the image below.

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使用钢笔工具(P)，绘制一个路径，然后填充黑色。

Draw a path with the Pen Tool (p) and fill it with black.

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现在使用钢笔工具(P)绘制一条路径，如下图所示，然后应用自定义笔刷。

Now create a path with the Pen Tool (p) as you see in the image below, then apply the custom brush.

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