PK_blend_update_t    


typedef int PK_blend_update_t;


This data type en/dis-ables some changes to the blending algorithms which
might cause differences in model updates between versions.  It currently has
two values:

    PK_blend_update_0_c         for updating v9.1 models
    PK_blend_update_1_c         for updating v10.0 models