6. Presets

MetaRoadPreset - a asset that allows you to store and use various user presets, such as:

Profiles for all procedurally generated objects (Road Surface, Sidewalk, markings, curbs, etc.)
The road lane attributes
Road profiles for drawing (number and types of lanes)

There can be many presets in a project, but logically they are all combined into one. Therefore, you need to be careful with the names of profiles in presets, because if two or more presets contain profiles with the same name, only one will be used at random.
To create a new preset, simply create a new Meta Road Preset asset in the Content Browser:
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The MetaRoad plugin already has a default preset at /MetaRoad/DefaultPreset. It should not be changed for backward compatibility, but there may be cases when it is necessary (for example, to change left-hand traffic to right-hand traffic):
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6.1. Driveable Material Profiles

Contains material profiles for Road Lane type RoadLaneDriving. You can specify the material and decals for driveable road lanes. These profiles are available in Build Mesh Modeling Tool:
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6.2. Sidewalk Material Profiles

Contains material profiles for Road Lane type RoadLaneSidewalk. You can specify the material for sidewalk road lanes. These profiles will be available in Build Mesh Modeling Tool:
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6.3. Curb Profiles

Contains curb type profiles for Road Lane type RoadLaneSidewalk. You can set the curb material and geometry. These profiles are available in Build Mesh Modeling Tool:
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6.4. Lane Mark Profiles

Contains profiles of road marking types for Road Lane type RoadLaneDriving. You can specify the type (solid, dashed, double), dimensions, and color of the marking strip. These profiles are available in Road Mark Attribute:
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6.5. Road Lanes Material Profiles

Contains road marking material profiles for Road Lane type RoadLaneDriving. You can specify the Road Marks material. These profiles will be available in Build Mesh Modeling Tool:
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6.6. Road Lanes Profiles

Contains road section profiles for drawing in Draw/Add Spline Build Mesh Modeling Tool -> Road Profile:
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6.7. Road Attribute Entries

Road Attribute Entry is a helper constructor object that allows you to quickly create presets for Lane Attribute and add them to Road Lane. All Road Attribute Entries from all presets are automatically available in Road Attribute Editor Mode:
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There are 3 main types of Road Attribute Entries (Component Template, Spline Mesh, Custom Builder):
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6.7.1. Component Template

Allows to generate arbitrary USceneComponent along Road Lane at a specified interval during the Build Mesh process.
Simply create a BP or C++ class inherited from USceneComponent:
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Then, in Road Attribute Entry, specify the created class in Component Template and set LengthOfSegment. After that, the created preset will be available in the Lane Attribute:
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And now it can be added to Road Lane:
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This template is convenient to use for repeating objects along Road Lane, such as traffic cones, flagpoles, lampposts, and power lines.

6.7.2. Spline Mesh

Allows to generate USplineMeshComponent along Road Lane during the Build Mesh process. To do this, specify the desired Static Mesh in Road Attribute Entry and set LengthOfSegment, after which the created preset will be available in the Lane Attribute:
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And now it can be added to Road Lane:
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6.7.3. Custom Builder

Provides the ability to write a custom attribute handler in C++ or BP during the Build Mesh process. To do this, need to create a class inherited from UCustomSplineBuilder and override the Generate Asset function:
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After that, you need to specify the created class in the preset, and it will become available in Lane Attribute:
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