确定光照贴图生成器是否应生成方向光照贴图或非方向光照贴图。（仅限编辑器）。
当将其设置为 Directional 时，Unity 会生成一个额外的光照贴图，该贴图对每个纹素位置的入射光的主导方向进行编码。当将其设置为 Non-Directional 时，Unity 不会生成这些额外的光照贴图。
使用方向光照贴图可以改善法线贴图材质的渲染效果，但会增加存储和内存消耗。
SM2.0 硬件无法解码方向光照贴图；在这种情况下，Unity 会回退到使用非方向光照贴图。
此属性确定下一次烘焙是否生成方向光照贴图或非方向光照贴图。您可以使用 LightmapSettings.lightmapsMode 属性访问上次烘焙生成的方向光照贴图或非方向光照贴图。
此设置会影响烘焙全局照明系统生成的光照贴图。
当 Unity 将此 LightingSettings 对象序列化为 灯光设置资源 时，此属性对应于灯光设置资源检查器中的 方向模式 属性。
其他资源：灯光设置资源、方向光照贴图。
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