Terrain (jMonkeyEngine3)

All Known Implementing Classes:

TerrainGrid, TerrainQuad
```
public interface Terrain
```
Terrain can be one or many meshes comprising of a, probably large, piece of land. Terrain is Y-up in the grid axis, meaning gravity acts in the -Y direction. Level of Detail (LOD) is supported and expected as terrains can get very large. LOD can also be disabled if you so desire, however some terrain implementations can choose to ignore useLOD(boolean). Terrain implementations should extend Node, or at least Spatial.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`void`	`adjustHeight(java.util.List<Vector2f> xz, java.util.List<java.lang.Float> height)` Raise/lower the height at many points.
`void`	`adjustHeight(Vector2f xzCoordinate, float delta)` Raise/lower the height in one call (instead of getHeight then setHeight).
`void`	`generateEntropy(ProgressMonitor monitor)` Pre-calculate entropy values.
`float`	`getHeight(Vector2f xz)` Get the real-world height of the terrain at the specified X-Z coorindate.
`float[]`	`getHeightMap()` Get the heightmap of the entire terrain.
`float`	`getHeightmapHeight(Vector2f xz)` Get the heightmap height at the specified X-Z coordinate.
`Material`	`getMaterial()` Returns the material that this terrain uses.
`Material`	`getMaterial(Vector3f worldLocation)` Returns the material that this terrain uses.
`int`	`getMaxLod()` This is calculated by the specific LOD algorithm.
`Vector3f`	`getNormal(Vector2f xz)` Get the normal vector for the surface of the terrain at the specified X-Z coordinate.
`int`	`getNumMajorSubdivisions()`
`int`	`getTerrainSize()` Used for painting to get the number of vertices along the edge of the terrain.
`void`	`setHeight(java.util.List<Vector2f> xz, java.util.List<java.lang.Float> height)` Set the height at many points.
`void`	`setHeight(Vector2f xzCoordinate, float height)` Set the height at the specified X-Z coordinate.
`void`	`setLocked(boolean locked)` Lock or unlock the meshes of this terrain.

- Method Detail
  - getHeight
```
float getHeight(Vector2f xz)
```
    Get the real-world height of the terrain at the specified X-Z coorindate.
    
    Parameters:
    
    xz - the X-Z world coordinate
    
    Returns:
    
    the height at the given point
  - getNormal
```
Vector3f getNormal(Vector2f xz)
```
    Get the normal vector for the surface of the terrain at the specified X-Z coordinate. This normal vector can be a close approximation. It does not take into account any normal maps on the material.
    
    Parameters:
    
    xz - the X-Z world coordinate
    
    Returns:
    
    the normal vector at the given point
  - getHeightmapHeight
```
float getHeightmapHeight(Vector2f xz)
```
    Get the heightmap height at the specified X-Z coordinate. This does not count scaling and snaps the XZ coordinate to the nearest (rounded) heightmap grid point.
    
    Parameters:
    
    xz - world coordinate
    
    Returns:
    
    the height, unscaled and uninterpolated
  - setHeight
```
void setHeight(Vector2f xzCoordinate,
               float height)
```
    Set the height at the specified X-Z coordinate. To set the height of the terrain and see it, you will have to unlock the terrain meshes by calling terrain.setLocked(false) before you call setHeight().
    
    Parameters:
    
    xzCoordinate - coordinate to set the height
    
    height - that will be set at the coordinate
  - setHeight
```
void setHeight(java.util.List<Vector2f> xz,
               java.util.List<java.lang.Float> height)
```
    Set the height at many points. The two lists must be the same size. Each xz coordinate entry matches to a height entry, 1 for 1. So the first coordinate matches to the first height value, the last to the last etc.
    
    Parameters:
    
    xz - a list of coordinates where the height will be set
    
    height - the heights that match the xz coordinates
  - adjustHeight
```
void adjustHeight(Vector2f xzCoordinate,
                  float delta)
```
    Raise/lower the height in one call (instead of getHeight then setHeight).
    
    Parameters:
    
    xzCoordinate - world coordinate to adjust the terrain height
    
    delta - +- value to adjust the height by
  - adjustHeight
```
void adjustHeight(java.util.List<Vector2f> xz,
                  java.util.List<java.lang.Float> height)
```
    Raise/lower the height at many points. The two lists must be the same size. Each xz coordinate entry matches to a height entry, 1 for 1. So the first coordinate matches to the first height value, the last to the last etc.
    
    Parameters:
    
    xz - a list of coordinates where the height will be adjusted
    
    height - +- value to adjust the height by, that matches the xz coordinates
  - getHeightMap
```
float[] getHeightMap()
```
    Get the heightmap of the entire terrain. This can return null if that terrain object does not store the height data. Infinite or "paged" terrains will not be able to support this, so use with caution.
  - getMaxLod
```
int getMaxLod()
```
    This is calculated by the specific LOD algorithm. A value of one means that the terrain is showing full detail. The higher the value, the more the terrain has been generalized and the less detailed it will be.
  - setLocked
```
void setLocked(boolean locked)
```
    Lock or unlock the meshes of this terrain. Locked meshes are un-editable but have better performance. This should call the underlying getMesh().setStatic()/setDynamic() methods.
    
    Parameters:
    
    locked - or unlocked
  - generateEntropy
```
void generateEntropy(ProgressMonitor monitor)
```
    Pre-calculate entropy values. Some terrain systems support entropy calculations to determine LOD changes. Often these entropy calculations are expensive and can be cached ahead of time. Use this method to do that.
  - getMaterial
```
Material getMaterial()
```
    Returns the material that this terrain uses. If it uses many materials, just return the one you think is best. For TerrainQuads this is sufficient. For TerrainGrid you want to call getMaterial(Vector3f) instead.
  - getMaterial
```
Material getMaterial(Vector3f worldLocation)
```
    Returns the material that this terrain uses. Terrain can have different materials in different locations. In general, the TerrainQuad will only have one material. But TerrainGrid will have a different material per tile. It could be possible to pass in null for the location, some Terrain implementations might just have the one material and not care where you are looking. So implementations must handle null being supplied.
    
    Parameters:
    
    worldLocation - the location, in world coordinates, of where we are interested in the underlying texture.
  - getTerrainSize
```
int getTerrainSize()
```
    Used for painting to get the number of vertices along the edge of the terrain. This is an un-scaled size, and should represent the vertex count (ie. the texture coord count) along an edge of a square terrain. In the standard TerrainQuad default implementation, this will return the "totalSize" of the terrain (512 or so).
  - getNumMajorSubdivisions
```
int getNumMajorSubdivisions()
```

Interface Terrain

Method Summary

Method Detail

getHeight

getNormal

getHeightmapHeight

setHeight

setHeight

adjustHeight

adjustHeight

getHeightMap

getMaxLod

setLocked

generateEntropy

getMaterial

getMaterial

getTerrainSize

getNumMajorSubdivisions