"I have had to have conversations with my children I never thought I would have to. Conversations children should never have to have."
She said his offending was a huge breach of trust.
"Why did the man ... do this?"
"It is said people come into your life for a reason but I'm at a loss for why you came into ours.
"You have destroyed her trust and innocence."
McCartney appeared in the Palmerston North District Court today while his victim watched from a separate room.
His lawyer Mark Alderdice asked that the focus of his sentence be on rehabilitation as well as acknowledging the distress and hurt that he has caused the girl.
"This offending had repercussions not just for the victim but also for her (family)," he said.
"He's on the path to understanding that."
Alderdice sought a period of intensive supervision and community work.
"If he is not walking the talk and this is simply sentence-based remorse then this is easily discoverable."
The offending happened over the course of a week at the end of 2021 with McCartney making four videos and saving them to a USB drive.
He filmed her showering on two occasions and in her underwear in her bedroom on two separate occasions.
Judge Chris Sygrove sentenced him to 18 months intensive supervision, 150 hours community work and to pay $5000 in emotional harm reparation to the victim.