Patrick Patterson and Terrence Ross are the Raptors' dedicated gunners - their largest contribution will always be their ability to hit that long ball worth extra points, and as a side effect their ability to spread the floor for their more paint-dominant teammates like DeMar DeRozan, Kyle Lowry, Cory Joseph and Jonas Valanciunas.
But they started the year like this:
Before Dec 1st:
Patterson 3PT%: 34%
Ross 3PT%: 29%
Both are well down from what we've come to expect from the two, of course with Ross being much worse.