Does anyone by chance know what the

[quartz umbra]

The first value is the number of vertices assuming that all points sharing a common position are a single vertex. In the editor this is how you see and manipulate vertices. In code these are referred to as common, or shared (depends how old the code is) vertices. However because each vertex has multiple additional attributes, like texture and normal coordinates that are often different than other coincident vertices, it is necessary to split these into multiple entries when sending data to the GPU. The number of actual vertices after this splitting process is the second value shown in parenthesis.