Surface is a definition of surface type which contains material, set of meshes and other objects. Surfaces are used for painting and object creation by means of brush.
Learn more about the surfaces by the link.
To create a surface it is easier to make a copy of an existing example, it is located in 'Samples\Starter Content\Models\Ribbon Grass\Ribbon Grass.surface'.
A surface consists of groups of elements, groups, for its part, include elements. The element indicates the probability of the element getting when painting with a brush, and other settings.
At the moment, the surface may contain only 3D models; support for other types of objects will be added in the future.
|Probability||The probability of choosing this group of elements from others when drawing.|
|Min Distance Between Objects||The minimum distance between objects when drawing.|
|Position ZRange||The range of possible Z-axis object position displacements when drawing.|
|Rotate Around Its Axis||Whether to set the random value of the object rotation around its axis when drawing.|
|Max Incline||The maximum angle of the object.|
|Scale Range||The range of possible scaling of the object when drawing.|
|Probability||The probability of choosing this element from others when drawing.|
|Mesh||The mesh used by the element.|
|Replace Material||Replaces all geometries of the mesh by another material.|
|Visibility Distance||Maximum visibility range of the object.|
|Cast Shadows||Whether to cast shadows on the other surfaces.|
|Receive Decals||Whether it is possible to apply decals the surface.|