Selection via Image Maps

If you need to work with selections depending on an map layer or a map, simply define a boolean attribute for the selection that you require.

Using the terrain for selection

Your terrain layer contains an elevation attribute of a similar form like below:

attr elevation = map_01(brightness, 100, -100)
You want to select all elements that have an elevation of 10 meters or higher. Simply add a new attribute that evaluates to true when elevation is bigger than 10.
attr high = elevation > 10

attr_elevated
The new attribute elevation in the terrain layer

Boolean attributes in map layers are automatically added to the selection menu.
Click Select → Select Objects in Map Layer → terrain: high.

The resulting selection is shown in the image below:

attr_elevated
Shapes above 10 meters are selected

By selecting a layer before selecting objects by map layer you can select only objects from the selected layer. If you have a layer selected that does not contain any objects this leads to nothing being selected.

 

Using a landuse map for selection

Landuse types are often used to define certain areas of a scene. The map below defines commercial (red), urban residential (blue) and residential areas.

attr_elevatedattr_elevated
A typical landuse map in red, blue and green and as it is placed in the scene

After adding the a new map layer with the landusemap, 3 new boolean attributes are defined in the Inspector view of the new layer. Depending on the color of the map, landuse types are evaluated.

attr_elevated
The new attributes for different landuse types

attr_elevated
Shapes in the commercial area are selected

Selection using the u,v coordinates of a map layer

For the following landuse attribute definition,

attr landuse =
	case u > 0.5:
		50%: "industrial" 
		else: "retail" 
	else: "residential"
  

just add the following attributes to the same map layer:

attr isIndustrial = landuse == "industrial" 

attr isRetail = landuse == "retail" 

attr isResidential = landuse == "residential"  
  

This will give you the following additional selection possibilities in the context menu:

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