Mobile and Pervasive Construction Visualization Using Outdoor Augmented Reality - Mobile and Pervasive Computing in Construction - page 66

ROUTE ReturnRoad (-83.728180,42.287913,260.00)
(-83.727064,42.287469,260.00)
(-83.726099,42.288374,260.00)
(-83.726442,42.289152,260.00);
LOADMODEL Hauler Truck.lwo;
LOADMODEL Bucket Bucket.lwo;
OBJECT Hauler1 Hauler;
OBJECT Bucket1 Bucket;
CONNECT Bucket1 Hauler1 (-7,2.2,0);
POSITION Hauler1 ON ReturnRoad;
SIMTIME 12;
TRAVEL Hauler1 ReturnRoad 15;
Figure 5.8 Portion of a sample ARVISCOPE animation trace file
attached to the hauler. This new meta-object, now called Hauler1 , is then placed
on the predefined route.
Further processing of the trace file is suspended until simulation time 12 is
reached. At this time, Hauler1 starts moving on the route ReturnRoad and this
trip requires 15 units of simulation time to complete. During the animation, the
ratio of simulated time to viewing time (also known as viewing ratio) is maintained
at a constant value specified by the user in the beginning of the animation. For
example, if this ratio is three, the animation will show Hauler1 at the beginning of
route ReturnRoad for four seconds and then the truck starts traveling on the
route for five seconds.
5.7 ARVISCOPE language design issues
Several basic object handling issues in designing the syntax of the ARVISCOPE
language had to be addressed tomake it capable of describing complex construction
scenes. Two major challenges had to be addressed during the design course of
ARVISCOPE:
* Converting global coordinates of an object to user's local coordinate frame
when updating the virtual contents of the augmented viewing frustum at each
animation frame.