Mapping Image Data to Rule Attributes
Map layers are a very powerful tool to control CGA shape grammar rules. Any attribute that you have defined in your CGA shape grammar rules can be mapped from an attribute layer. This allows you to guide your rules by maps. Typically, maps are used for controlling building attributes such as height or appearance, level of detail, or land-use mixes.
The image below is going to be used as source image to control the height of a set of buildings.Assume you are starting from a scene with a set of building footprints like in the image below: All shapes have a rule file assigned that extrudes the footprints to a certain height
attr height = 30 Lot --> extrude(height)
Creating the map layer
Create a new mapping layer, choose your skyline map, set the bounds to fit your scene, and add a new attribute skylineValue. Its range will define the range of the building heights.
Select all footprint shapes, and click on the connection icon for rule attribute height in the Inspector. Choose layer attribute, select the new Skyline map layer and the attribute skylineValue
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