Building in Four Dimensions! - Google SketchUp Workshop: Modeling, Visualizing, and Illustrating - page 109

Landscaping. For each these 4D types, three materials are automatically
created in SketchUp's Materials library:
• Name4DType _pre: The material that the 4D SketchUp object will receive
before the start date for the activity (before the start date)
• Name4DType _act: The material that the SketchUp object will receive while
its activity is being carried out (i.e., between the start and finish dates)
• Name4DType _post: The color that the 4D SketchUp object will receive
when its activity is completed (after the finish date)
All these colors can be edited using SketchUp's Materials editor.
FiG 6.5 The 4D types are denoted
by their SketchUp materials, and it
is possible to modify these using
SketchUp's Materials editor.
Stage 6: Improving the Image by Adjusting the Shadows
Objective : To increase the model's readability.
Data : The SketchUp xD model created in the preceding stages.
Tool : SketchUp's Shadows option.
For each visualization date chosen, the shadows are now generated. If the
model is large, this can result in a slowdown.