Tilting the terrain

Unity Engine
1

I do know that rotating the terrain is impossible.
Hi, I’m trying to make a terrain that on one side it has a height of 400, and on the other it has a height of 300, so basically I’m trying to make a slow incline. The only way that I know how to do this is by using unity’s terrain height painting tool, but it comes out looking very rough, where as I want it to be flat. There has to be a better way of doing this, something that I am overlooking, but after searching I found nothing. Any suggestions?

2

Generate it in some terrain modelling app. Ot if you want just simple decline, make gradient in photoshop and eport as raw.

3

Setting the terrain heights in code and using SetHeights() would probably be the easiest and most flexible.

–Eric

4

I wrote a script a while back to do just this. It’s not pretty, but it worked great:

using UnityEditor;
using UnityEngine;
using System.Collections;
using System;
using System.Collections.Generic;

public class TerrainSlopeTool : EditorWindow {
	
	static float _startingX = 0f;
	static float _startingY = 0f;
	static float _endingX = 1f;
	static float _endingY = 0f;
	static float _scale = 0f;
	
	[MenuItem("Meriwether/Show Terrain Slope Tool")]
	static void ShowWindow() {
		EditorWindow.GetWindow<TerrainSlopeTool> ();
	}
	
	public void OnGUI(){
		if (GUILayout.Button("Apply Slope")){
			SlopeTerrain();
		}
		
		if (GUILayout.Button("Lower Terrain")){
			LowerTerrain();
		}
		
		if (GUILayout.Button("Scale Terrain")){
			ScaleTerrain();
		}
	}
	
	static void SlopeTerrain(){
		GameObject source = Selection.activeGameObject;
		
		if (source == null || source.GetComponent(typeof(Terrain)) == null){
			Debug.LogError("Cannot apply slope, no valid terrain selected!");
			return;
		}
		
		Terrain sourceTerrain = (Terrain)source.GetComponent(typeof(Terrain));
		TerrainData tdata = sourceTerrain.terrainData;
		
		float[,] sourceHeights = tdata.GetHeights(0,0,tdata.heightmapWidth,tdata.heightmapHeight);
		float[,] newHeights = tdata.GetHeights(0,0,tdata.heightmapWidth,tdata.heightmapHeight);
		
		bool clippedBelow = false;
		bool clippedAbove = false;
		
		for (int i = 0; i < tdata.heightmapWidth; i++){
			for (int j = 0; j < tdata.heightmapHeight; j++){
				float floati = i;
				float floatj = j;
				float widthp = floati / tdata.heightmapWidth;
				float heightp = floatj / tdata.heightmapWidth;
				
				newHeights[i,j] = sourceHeights[i,j] + Mathf.Lerp(_startingX, _endingX, widthp) + Mathf.Lerp(_startingY, _endingY, heightp);
				
				if (newHeights[i,j] < 0){
					clippedBelow = true;
				} else if (newHeights[i,j] > 1) {
					clippedAbove = true;
				}
			}
		}
		
		if (clippedBelow){
			Debug.LogWarning("Warning: Clipped below 0!");
		}
		if (clippedAbove){
			Debug.LogWarning("Warning: Clipped above 1!");
		}
		
		tdata.SetHeights(0, 0, newHeights);
		
		tdata.RefreshPrototypes();
		sourceTerrain.Flush();
	}
	
	static void LowerTerrain(){
		GameObject source = Selection.activeGameObject;
		
		if (source == null || source.GetComponent(typeof(Terrain)) == null){
			Debug.LogError("Cannot lower terrain, no valid terrain selected!");
			return;
		}
		
		Terrain sourceTerrain = (Terrain)source.GetComponent(typeof(Terrain));
		TerrainData tdata = sourceTerrain.terrainData;
		
		float[,] sourceHeights = tdata.GetHeights(0,0,tdata.heightmapWidth,tdata.heightmapHeight);
		float[,] newHeights = tdata.GetHeights(0,0,tdata.heightmapWidth,tdata.heightmapHeight);
		
		float lowestValue = 1;
		
		for (int i = 0; i < tdata.heightmapWidth; i++){
			for (int j = 0; j < tdata.heightmapHeight; j++){
				if (sourceHeights[i,j] < lowestValue){
					lowestValue = sourceHeights[i,j];
				}
			}
		}
		
		for (int i = 0; i < tdata.heightmapWidth; i++){
			for (int j = 0; j < tdata.heightmapHeight; j++){
				if (sourceHeights[i,j] < lowestValue){
					lowestValue = sourceHeights[i,j];
				}
				newHeights[i,j] = sourceHeights[i,j] - lowestValue;
			}
		}
		
		tdata.SetHeights(0, 0, newHeights);
		
		tdata.RefreshPrototypes();
		sourceTerrain.Flush();
	}
	
	static void ScaleTerrain(){
		GameObject source = Selection.activeGameObject;
		
		if (source == null || source.GetComponent(typeof(Terrain)) == null){
			Debug.LogError("Cannot lower terrain, no valid terrain selected!");
			return;
		}
		
		Terrain sourceTerrain = (Terrain)source.GetComponent(typeof(Terrain));
		TerrainData tdata = sourceTerrain.terrainData;
		
		float[,] sourceHeights = tdata.GetHeights(0,0,tdata.heightmapWidth,tdata.heightmapHeight);
		float[,] newHeights = tdata.GetHeights(0,0,tdata.heightmapWidth,tdata.heightmapHeight);
		
		for (int i = 0; i < tdata.heightmapWidth; i++){
			for (int j = 0; j < tdata.heightmapHeight; j++){

				newHeights[i,j] = sourceHeights[i,j] * _scale;
			}
		}
		
		tdata.SetHeights(0, 0, newHeights);
		
		tdata.RefreshPrototypes();
		sourceTerrain.Flush();
	}
}

It would take all of a minute to make those variables editable on the window, no clue why I didn’t bother doing that.

5

Thank you all so much for the help, but I ended up using KyleStaves’ code, and since I have very little knowledge on c# scripting, how would I go about making those variables editable?