Voges, celebrating his second test century and in front of friends and family at his home ground, said the pitch was still good for batsmen.
''It's been a bit of a war of attrition over these four days, but we've got some options going into (the final day)."
Late in the day the pitch did start to play up, with uneven bounce and some turn.
''There's certainly some cracks starting to open up and I thought there were a couple of balls that misbehaved late today. Hopefully if and when we do set up a run chase those cracks can come into play."
Smith was struck two blows by New Zealand seamer Matt Henry, on the helmet and arm, which required treatment.
If that is an indication of how the pitch could play, Smith might be tempted to pull out earlier than he might otherwise.
His timing will be important.
Last summer, when he was filling in for the injured Michael Clarke, he had a similar situation against India in Melbourne.
Smith stalled overly long until his team were 318 for nine, setting India an unachievable 384 and only 66 overs in which to bowl them out.
But he may be wary of offering too large a carrot to a New Zealand team with plenty of attacking batsmen, notably captain Brendon McCullum.
There have been six centuries on the first four days of the test - two of them, by David Warner and Ross Taylor, double tons - and precious little for the bowlers to cheer about.
The first two innings combined produced a Waca record 1183 runs, 190 runs more than the previous highest, when England were touring in 1986-87.
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WAGONWHEEL
MANHATTAN
