Merge commit 'f86253816b7166096111d29cb3708b1156f7ebf3' * commit 'f86253816b7166096111d29cb3708b1156f7ebf3': the vertex index should be "first + i".
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Merge commit 'f86253816b7166096111d29cb3708b1156f7ebf3' * commit 'f86253816b7166096111d29cb3708b1156f7ebf3': the vertex index should be "first + i".