Roughtly define the features, using the brush tool, but all according to the light source that I decided to keep to the right of the model (our left).
大致地确定一下形态，使用笔刷工具，不过全都要按照灯光的方向来定义，我决定让灯光从模型的右边照过来（我们的左侧）
Raster operation codes define how GDI combines colors in output operations that involve a current brush, a possible source bitmap, and a destination bitmap.
光栅操作模式说明了GDI是如何组合输出操作中的颜色，包括当前画刷、可能的源位图和目标位图。
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