TriangleFunctor中变量 _treatVertexDataAsTemporary起什么作用？

panbin

源文件中介绍：
*  treatVertexDataAsTemporary, indicates whether these vertices are coming from  a "real" vertex array, or from a temporary vertex array, created by the \c
*  TriangleFunctor from some other geometry representation.
*  @see \c PrimitiveFunctor for general usage hints.

real 和 temporary 分别指什么情况？

array

这个我不是特别清楚，不过来自顶点数组的数据肯定_treatVertexDataAsTemporary是true。