An exemplary depth scanning system includes first and second depth scanning devices. The first device detects depth data for surfaces included within a real-world scene from a first vantage point by rotating a first scan head in one rotational direction to progressively aim a first scan field to sweep across the surfaces during a scan time period. The second device detects depth data for the surfaces from a second vantage point by rotating a second scan head in phase with the rotation of the first scan head and in the opposite rotational direction so as to progressively aim a second scan field to sweep across the surfaces during the scan time period. The in-phase rotations of the first and second scan heads cause the first scan field to aim at the second vantage point at a same moment when the second scan field aims at the first vantage point.