图3显示了在进行绘制时，可以从调色板选择颜色。
Figure 3 shows that when you draw you have the option to choose colors from the panel.
在用cairo进行绘图时，最简单的操作就像手工绘画时一样：选择绘图介质，选择画笔，选择颜色，考虑线条的布局，然后进行实际绘制。
When drawing with Cairo, the simplest operations are akin to choosing your medium, selecting a brush, choosing a color, thinking about the line placement, then actually drawing the lines.
在绘制时根据不同距离选择不同复杂度的树木模型，加快了渲染的速度。
The LOD technology is used, and selecting the tree models of different complexities according to different distances improves the speed of rendering.
细节层次模型是指对同一个场景或场景中的物体，使用具有不同细节的描述方法得到一组模型，供绘制时选择使用。
Level of detail (LOD) are a group of models at different levels, which are used to describe one scene or its object and be selected for protracting.
地形实时绘制时LOD数据的选择是基于屏幕误差的。
In rendering time, the choosing of LOD is driven by screen space error.
细节层次模型是指对同一个场景或场景中的物体，使用具有不同细节的描述方法得到一组模型，供绘制时选择使用。
Level of detail are a group of models at different levels, which are used to describe one scene or its object and be selected for protracting.
细节层次模型是指对同一个场景或场景中的物体，使用具有不同细节的描述方法得到一组模型，供绘制时选择使用。
Level of detail are a group of models at different levels, which are used to describe one scene or its object and be selected for protracting.
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