Terrain World Component

The Terrain World component provides the data required for other terrain system components.

Important:
You must add this component to the Level entity, the parent of all entities in an Open 3D Engine (O3DE) level.

Provider

Terrain Gem

Terrain World Properties

Terrain World component interface.

PropertyDescriptionValuesDefault
Min HeightThe minimum value for the height of terrain. The Min Height value must be less than the max Height value.-65536.0 - 65536.00.0
Max HeightThe maximum value for the worlds bounds. The Max Height value must be greater than the Min Height value.-65536.0 - 65536.01024.0
Height Query Resolution (m)The distance between each height sample position, in meters.0.1 to Infinity1.0
Surface Data Query Resolution (m)The distance between each surface data sample position, in meters.0.1 to Infinity1.0

Usage

We recommend that you set the Min Height and Max Height bounds to as small of a range as possible, to achieve more accurate height values . The terrain renderer uses 16-bit height values, which provides 65536 possible distinct heights. To get the resolution, calculate: (Max Height - Min Height) / 65536. So, if the height range is 1 km, then the resolution is about 1.5 cm. This results in finer height detail.

Height Query Resolution and Surface Data Query Resolution are used to define consistent spacing, centered at the origin, for terrain height and surface queries across the entire world. Different systems that use terrain data, such as physics and rendering, can also use these conceptual grids to make implementation decisions about how to best use the terrain data. By default, the terrain system queries the input data only at points aligned to the grid. This creates a consistent view of the input data. However, you can author or generate input data to the terrain system at any resolution. Since the input data is only used at these resolutions, we recommend that input gradients that have quantized source data, like images, match the appropriate query resolution.

For example, if a terrain uses a heightmap image with 10 texels/meter with a 1 meter height query resolution, then 9 out of 10 of the texels are ignored. If the heightmap image has 1 texel/meter with a 1 meter height query resolution, then all of the texels are used.

For physics, Height Query Resolution controls the density of the underlying height field collider. For rendering, this determines the triangle density of the closest level of detail. Surface Data Query Resolution affects the density of detail materials for detail material blending.