1. A system for manipulating virtual objects within a virtual environment comprising: a housing; a first touch sensor area comprising: a first touch sensor surface extending across a first region of the exterior of the housing; a first array of sense electrodes patterned across a substrate; and a first resistive layer interposed between the first touch sensor surface and the first array of sense electrodes, in contact with the first array of sense electrodes, and comprising a material exhibiting variations in local electrical resistance responsive to variations in force applied to the first touch sensor surface; a second touch sensor area comprising: a second touch sensor surface extending across a second region of the exterior of the housing opposite the first region; a second array of sense electrodes; and a second resistive layer interposed between the second touch sensor surface and the second array of sense electrodes, in contact with the second array of sense electrodes, and comprising the material; a controller coupled to the housing and configured: to scan the first array of sense electrodes and the second array of sense electrodes during a scan period; to detect a first input of a first force magnitude at a first location on the first touch sensor surface based on a change in resistance values of a subset of sense electrodes in the first array of sense electrodes; to detect a second input of a second force magnitude at a second location on the second touch sensor surface based on a change in resistance values of a subset of sense electrodes in the second array of sense electrodes; and to generate a touch image defining the first location and the first magnitude of the first input and the second location and the second magnitude of the second input for the scan period.