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3 Common Types of 3D Sensors: Stereo, Structured Light, and ToF. In many robotic applications, 3D sensing has become the de facto choice for tasks such as near-field object detection and collision avoidance, surface and object inspection, and map creation. We’ll be covering the three most common 3D sensors that we work with at Tangram Vision. We won’t be covering LiDAR, despite the fact that LiDar data is also three dimensional.