low-poly-terrain-generator

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low-poly-terrain-generator

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A low poly terrain generator for the Unity Engine.

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# Low Poly Terrain Generator
A low poly terrain generator for the Unity Engine as a editor tool.

![editor](https://user-images.githubusercontent.com/39056343/157112662-14f3100d-98c6-41f8-8e51-93b891491bf2.PNG)

## Import
To use the terrain generator inside your Unity project, copy the files from the [latest release](https://github.com/escheiermann/low-poly-terrain-generator/releases/tag/Latest) and add them to your project assets

## Usage 
To use the terrain generator within the Unity Editor, navigate to _GameObject > Generate Low Poly Terrain_.

![editor2](https://user-images.githubusercontent.com/39056343/157121107-a352f1d3-fcb5-4807-8133-ab20c9e9e0b5.PNG)

A new window (Wizard) appears on the screen. Parameters to adjust are:
- *Length* of the terrain
- *Width* of the terrain
- *Maximum Height* of the terrain. 
- *Material* of the terrain.
- *Height Source* to shape the terrain according to a pattern.
- *Height Map* a grayscale image to retrieve height information (Only usable when Height Source is Height Map).
- *Scale* of the noise pattern (Only usable when Height Source is Noise).
- *Tree Density* how many trees are placed on top of the terrain.
- *Trees* a list of tree Prefabs to be placed on the terrain.
- *Supply Density* how many supplies are placed on the terrain.
- *Supplies* a list of supply Prefabs (e.g. rocks, etc.) to be placed on the terrain.

## How it works
The terrain generator uses the [Unity Mesh API](https://docs.unity3d.com/ScriptReference/Mesh.html) to create the terrain.

The Mesh for the terrain is made up with triangles, each consisting of three vertices. The Y-coordinate of each vertex is calculated according to a specific strategy.
Currently supported strategies (or Height Sources) are:
- *Random*, which calculates a random number between 0 and the Maximum Height using the [Unity Random Class](https://docs.unity3d.com/ScriptReference/Random.html).
- *Noise*, which uses a 2D Noise Pattern as a Height Source with the [Perlin Noise Function](https://docs.unity3d.com/ScriptReference/Mathf.PerlinNoise.html) from Unity.
- *Height Map*, which uses a grayscale image as a Height Source.

![terrain](https://user-images.githubusercontent.com/39056343/157115915-1aee43b1-d21d-4eab-adcd-c827aa872157.PNG)

## Extending
To extend the Low Poly Terrain Generator and implement more strategies for Height Sources, extend the [HeightStrategy](https://github.com/escheiermann/low-poly-terrain-generator/blob/3258d7f5370b346f6ce979d298a7a25fca1c58d3/Low%20Poly%20Terrain%20Generator/Assets/Low%20Poly%20Terrain%20Generator/Generator/Height/Strategies/HeightStrategy.cs) Class.

Your own HeightStrategy implementation could look like this:
```c#
public class MyNewHeightStrategy : HeightStrategy {
  public MyNewHeightStrategy(int length, int width, int maximumHeight): base(length, width, maximumHeight) {}

override protected int GetHeight(int x, int y) {
    // Calculate Height...
  }
}
```

To make your own strategy available to be used from the editor tool, add a new [HeightStrategyType](https://github.com/escheiermann/low-poly-terrain-generator/blob/3258d7f5370b346f6ce979d298a7a25fca1c58d3/Low%20Poly%20Terrain%20Generator/Assets/Low%20Poly%20Terrain%20Generator/Generator/Height/HeightStrategyType.cs) to the enum:
```c#
public enum HeightStrategyType {
  Random, 
  Noise, 
  HeightMap,
  MyNewStrategy // Add your new strategy type here
}
```

Also add a new case to the [HeightStrategyFactory](https://github.com/escheiermann/low-poly-terrain-generator/blob/3258d7f5370b346f6ce979d298a7a25fca1c58d3/Low%20Poly%20Terrain%20Generator/Assets/Low%20Poly%20Terrain%20Generator/Generator/Height/HeightStrategyFactory.cs) Class:
```c#
public static HeightStrategy Create(TerrainOptions options) {
  HeightStrategy strategy;
  switch (options.heightSource) {
    case HeightStrategyType.MyNewStrategy: // Add your new strategy here
      strategy = new MyNewStrategy(options.length, options.width, options.maximumHeight);
      break;
    case HeightStrategyType.Noise: 
...
```

## License
The terrain generator is licensed under the MIT license.
For more information see the [project license](https://github.com/escheiermann/low-poly-terrain-generator/blob/main/LICENSE).

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