Computes the "strength" of the secondary interactivity, where "strength" is a 0-to-1 value indicating whether the secondary interactivity is being lightly used or fully used, respectively.
In the "spray bottle" example, a "strength" of 0 would indicate that the spray lever is not depressed at all, whereas a "strength" of 1 indicates full depression of the lever.
ParametersstrengthA "raw strength" which the IHandGrabUseDelegate can use to inform its calculation of the true "strength"
ReturnsThe true "strength" of the secondary interactivity