获取并设置一个布尔值，用于启用导入的 SpeedTree 模型上的法线贴图。
法线贴图（或凹凸贴图）使用法线贴图纹理提供更多表面细节，以提高视觉保真度。此变量的默认值为 true。
要更改特定 LOD 的此设置，请参阅 SpeedTreeImporter.enableBump 和 SpeedTreeImporter.enableSettingOverride。
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