Question L4-C3

The question is about the choice of sensor to acquire a 3D structure, included texture, of an apartment. On the right there is an illustration of an apartment, seen as a model in 3D, with texture of the ground, of the walls etc. The question is: "We target the application of creating the 3D visualisation of apartments. We want to use a robot that explores the whole apartment, extracts the 3D structure, and maps on this structure the visual texture to create a 3D navigable online environment. There are no budget or computational limitations for the robot and the goal is to have the higher resolution possible. We can only install one device on the robot. 
Which single device is the best (in term of resolution) to perform this task?". Four possibilities are proposed:

Answer A. "Radar". This answer is wrong, as the radar can get the 3D structure but not the texture.
In the explanation of the student we would like to see that they understand that the radar can get 3D measurement but only this, and not the texture that is required here by the single device that is allowed.

Answer B. "Laser scanner". This answer is wrong, as the laser scanner also can get the 3D structure but not the texture.
In the explanation of the student we would like to see that they understand that the laser scanner can get 3D measurement but only this, and not the texture that is required here by the single device that is allowed.

Answer C. "Stereo camera" This answer is correct, this is the only sensor that can acquire both 3D structure and texture in the given choice.
In the explanation of the student we would like to see that they understand that this sensor can capture the texture which getting 3D information.

Answer D. "Single camera". This answer is wrong, as a single camera can get the texture and in some cases the 3D structure, but cannot have a 3D structure resolution as the stereo camera and the 3D measurement is limited to some particular situations.
In the explanation of the student we would like to see that they understand that a single camera can capture the texture but can acquire the 3D structure only in some specific situations and with a lower resolution that a stereo camera.