This paper reports on a study that investigated the effect touching a Projection Augmented model, and interacting with it using a spatially-coincident device, has on the perception of size. It was found that touching increased the accuracy of size estimates, however interaction using a spatially-coincident device did not.
Citation:
Emily Bennett, Brett Stevens, "The Effect that Haptically Perceiving a Projection Augmented Model has on the Perception of Size," ismar, pp.294-295, Third IEEE and ACM International Symposium on Mixed and Augmented Reality (ISMAR'04), 2004