Game Development Reference
In-Depth Information
Figure 2.13 Handling a product with a location sensor (6DOF), enclosed in a cube. (Illustration: École
des mines de ParisTech, with permission)
2.5.1.4 Natural handling of 3D products with 6DOF
We go by the schema for handling an object in the real world and reproduce it in
the virtual environment. The only difference is in the visual feedback: The user sees a
screen and does not see his hands that operate a six-degrees-of-freedom location sensor
(tracker) enclosed in a cube. Since the handling movements are identical to those in the
real world, we could verify that the users have no difficulty in handling the product
virtually.
We added CogSA (proximity attractors and geometric constraints) to easily pick
a product from the shelf and to put it in a trolley. We also used an SMSA: Screening
the measurements of a location sensor which is necessary to delete the signal noises
that disturb the user while handing the products. The following are the results of the
assessment tests: 22 out of 24 subjects could observe the six sides of a packet and read
the print without any difficulty. Two subjects had problems in observing the top and
bottom of a product because they could not overcome the sensorimotor discrepancies.
2.5.1.5 Navigation in the shop
To go about the aisles, possible paths are predetermined to simplify the movement
commands (CogSA). In our case we need not let the consumer go wherever he wants
because we are not studying the layout of shelves in the shop. Therefore, we go by
the “moving by pushing a trolley'' schema. The movement command is given using a
trolley to be close to the actions one does in a real shop. The user has to push the trolley
ahead or pull it back and move it to left or right in front of the screen (Figure 2.14
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