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Terrain system

The terrain system displays the mountainous landscape of nature in an efficient way. Developers can easily use a brush to sculpt basins, mountains, valleys, plains and other landforms.

terrain

Creating a terrain

Two steps are required to create a terrain:

  1. Click the right mouse button in Hierarchy panel and click Create -> Terrain to create a terrain node. Terrain nodes can be moved, but rotation and zoom are not yet supported.

    create terrain

  2. Click the right mouse button in the Assets panel and click Create -> Terrain in the pop-up menu to create the necessary terrain assets.

    create terrain asset

Terrain component properties

Property Description
Asset Terrain asset
EffectAsset Terrain effect asset
ReceiveShadow Accept the shadow
UseNormalMap Use normal map
UsePBR Use physical materials
LodEnable Enable Terrain Lod, used to reduce the number of rendered faces and improve rendering performance
LodBias Set the starting distance of Lod

Using a terrain

Click on the created terrain node. There is a terrain component (cc.Terrain) in the Inspector panel, and the created terrain assets are assigned to the Asset in the terrain component.

terrain inspector

Editing a terrain

After assigning the terrain assets, the cc.Terrain editing panel can be accessed from the Scene panel. The terrain editing system includes three major functions: Manage, Sculpt, Paint and Select. These three functions can be switched between by clicking on the corresponding tabs.

terrain component

It is also possible to switch functions via the tools in the upper left corner of the Scene panel:

  • 1 -- Corresponds to the Manage function.
  • 2 -- Corresponds to the Bulge BrushMode in the Sculpt function.
  • 3 -- Corresponds to the Sunken BrushMode in the Sculpt function.
  • 4 -- Corresponds to the Smooth BrushMode in the Sculpt function.
  • 5 -- Corresponds to the Paint function.
  • 6 -- Corresponds to the Select function.

Management of terrains

Management is adjusting various parameters of a terrain. Tile is the smallest unit of terrain. Tile constitutes one 32x32 block of tiles with each terrain needing to consist of at least one tile block.

edit layer

Parameter Description
TileSize The size of the terrain tile. Currently, a terrain block consists of 32 x 32 tiles, so the side length of a terrain block is 32 x TileSize.
WeightMapSize Weight map size
LightmapSize Lightmap size
BlockCount Number of terrain blocks in two dimensions

Sculpting a terrain

Sculpting is changing the shape of a terrain.

edit layer

Parameter Description
BrushSize The size of the brush
BrushStrength The strength of the brush
BrushMode The type of the brush, including Bulge、Sunken and Smooth
Brush Custom brush style, by selecting a style picture to generate a custom brush.

To control the bulging/depression of the terrain, use the left mouse button and the Shift + left mouse button, respectively. The bulge and depression operation often makes the terrain look sharp, use the smoothing function to overdo it.

Painting a terrain

Painting is the texture used to depict the appearance of a terrain.

edit layer

Parameter Description
TileLayer Set the Layer of the terrain, as described in section Layer editing below.
BrushSize The size of the brush
BrushStrength The strength of the brush
BrushFalloff Brush falloff, this value determines the sharpness of the brush edge.
0.0 means that the brush has full effect in the whole range (all covered by the current layer texture), with sharp edges.
1.0 means that the brush has full effect only in its center, and the influence will be attenuated when reaching the edge.
Brush Custom brush style. by selecting a style picture to generate a custom brush.

Layer editing

edit layer

Click the + or - button at the top right to add or delete layers (up to 4 layers are supported). Once a Layer is selected, you can edit the Layer and its texture.

Parameter Description
TerrainLayer Current Layer texture
NormalMap To set the normal map of the current Layer, check the UseNormalMap property for the terrain component
Metallic Set the metal properties of the current Layer
Roughness Sets the roughness of the current Layer
TileSize The tile size of the texture. The smaller the value, the more tiles will be used in the same size area

Select

When switching to the Select tab and selecting a terrain block in the Scene panel, information about the current terrain block will be displayed.

edit layer

Parameter Description
Index The index of the currently selected terrain block.
Layers The texture list of the currently selected terrain block.
Wight The weight map of the currently selected terrain block.