Unity Terrain Script

Developers
1

here is a script for creating terrains from height maps. just pop in the terrain, your height map, and run it bam, your terrain looks like your height map. just copy paste into a blank script

    using UnityEngine;
using System.Collections;

public class TerrianScript : MonoBehaviour {

    public bool RunIt;
    public Terrain DaTerrain;
    private float[,] Heights;
    public Texture2D DaPic;

    //note this must be done while the game is running inorder to make it go


	// Use this for initialization
	void Start () {

	}
	
	// Update is called once per frame
	void Update () {
	

        if(RunIt)
        {
            DaMakers();
        }

	}
    private void DaMakers()
    {

        // a good place to get a height map from the website below
        //https://heightmap.skydark.pl
        //Warning - in older verisons of unity an alpha transparency will throw an error if imported, to fix, simply open and save in MS paint, or other wise remove alphas.



        Texture2D copy = duplicateTexture(DaPic);

        //this gets the terrian height data

        // WARNING - if the Terrain data is wider than your picture it will throw an error
        // 

        DaTerrain.terrainData.heightmapResolution = copy.width;

       Heights = DaTerrain.terrainData.GetHeights(0, 0, DaTerrain.terrainData.heightmapWidth, DaTerrain.terrainData.heightmapHeight);

        for (var i =0;i< DaTerrain.terrainData.heightmapWidth; i++)
        {
            for(var j=0;j< DaTerrain.terrainData.heightmapHeight; j++)
            {
                //the hieghts range from 0 to 1 and the tallest point will be 
                Heights[i, j] = copy.GetPixel(j, i).grayscale;
            }

            
        }
        

        DaTerrain.terrainData.SetHeights(0, 0, Heights);
        RunIt = false;
    }

    //this makes whatever height map you are importing reasonable
    private Texture2D duplicateTexture(Texture2D source)
    {
        RenderTexture renderTex = RenderTexture.GetTemporary(
                    source.width,
                    source.height,
                    0,
                    RenderTextureFormat.Default,
                    RenderTextureReadWrite.Linear);

        Graphics.Blit(source, renderTex);
        RenderTexture previous = RenderTexture.active;
        RenderTexture.active = renderTex;
        Texture2D readableText = new Texture2D(source.width, source.height);
        readableText.ReadPixels(new Rect(0, 0, renderTex.width, renderTex.height), 0, 0);
        readableText.Apply();
        RenderTexture.active = previous;
        RenderTexture.ReleaseTemporary(renderTex);
        return readableText;
    }
}
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