1. A method comprising: capturing an image depicting at least a portion of a first surgical instrument disposed at a first position with respect to a target tissue of a patient, and at least a portion of a second surgical instrument disposed at a second position with respect to the target tissue of the patient, the second position different from the first position; and transforming the image to a three-dimensional model such that (1) the first position of the portion of the first surgical instrument is rendered with the three-dimensional model, and (2) the second position of the portion of the second surgical instrument is rendered with the three-dimensional model; and calculating a distance between the portion of the first surgical instrument and the portion of the second surgical instrument based on the three dimensional model.