Support vertex value size change

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We need to support variable vertex value state, that is, the vertex value size 
of a vertex can be changed from the one of the first iteration.

Original issue reported on code.google.com by buyingyi@gmail.com on 29 Oct 2012 at 5:46

[GoogleCodeExporter]

Original comment by buyingyi@gmail.com on 29 Oct 2012 at 5:52

• Changed title: Support vertex value size change

[GoogleCodeExporter]

Original comment by buyingyi@gmail.com on 24 Mar 2013 at 7:30

• Changed state: Fixed