osg学习（四十九）osg的STATIC、DYNAMIC 的作用

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本文介绍了OSG库中DataVariance枚举类型的定义及其用途。此枚举用于指定对象的数据变化特性，包括静态（STATIC）、动态（DYNAMIC）及未指定（UNSPECIFIED）三种状态，以辅助优化代码等机制更高效地共享静态数据。

osg/object
enum DataVariance
        {
            DYNAMIC,
            STATIC,
            UNSPECIFIED
        };

/** Set the data variance of this object.
           * Can be set to either STATIC for values that do not change over the lifetime of the object,
           * or DYNAMIC for values that vary over the lifetime of the object. The DataVariance value
           * can be used by routines such as optimization codes that wish to share static data.
           * UNSPECIFIED is used to specify that the DataVariance hasn't been set yet. */