BIM-Based 4D Modeling and Scheduling - Construction Project Scheduling and Control - page 409

Figure 15.17 Snapshot of the shortcut for “Appearance Definitions”
from the drop-down list of “Selection Tree”: “Standard,” “Compact,” “Properties,”
and “Set”. “Standard” displays the default tree hierarchy, “Compact” displays a sim-
plified list given in the “Standard” form, “Properties” is used to display the tree
hierarchy where the structure is based on the item's properties, and “Set” displays
the hierarchy of selection and search sets. Snapshots of the “Selection Tree” are given
in Figures 15.18 and 15.19.
After the “Selection Sets” with 3D geometry information has been created, the
defined sets should be linked with the relevant tasks displayed in TimeLiner. If all
of the tasks have unique names (no two tasks with the same name) and “Selection
Sets” have the same name with their attached tasks, the linking process can be carried
out automatically. Also, the “Selection Set” can be linked to the associated tasks by
right-clicking a task in the Task tab in the TimeLiner and selecting “Attach Set.”
The snapshot for how to link “Selection Sets” with the relevant task is depicted in
Figure 15.20.
Creating the 4D Model and Project Animation
Once all of the schedule tasks are linked to the 3D model geometry through the use
of “Selection Set,” 4D modeling scenarios can be created. 4D model of the building
component can be visualized as a dynamic visualization of the component in Navis-
works TimeLiner: a movie of the project that displays the construction sequence and
also a series of snapshots taken from the movie that represents how the project looks
at any point in time.
With the use of “Simulate” tab, the 4D model of the building component can be
visualized from the beginning to the end of the project. The date from when the 4D
model will be displayed can be managed from the calendar, as shown in Figure 15.21.
The simulation can be stopped or paused when needed with the use of relevant buttons
(Figure 15.21). The setting of the 4D model animation can be defined by using the
“Simulation Settings” command, as shown in Figure 15.22. The “Override Start/End