Applying splatmaps - help

I have been trying to apply a texture to a terrain from C for over a week now. New to Unity3D however applying a texture to a primitive took me 30 seconds to figure out what am I not doing correctly here?

Code (csharp):

1. using UnityEngine;
2. using System.Collections;
3. using Utility;
4.  
5. public class test : MonoBehaviour
6. {
7.     //use this for initialization
8.     void Start ()
9.     {
10.         //create a new terrain data
11.         TerrainData _terrainData = new TerrainData();
12.  
13.         //set terrain width, height, length
14.         _terrainData.size = new Vector3(20, 1, 20);
15.  
16. SplatPrototype[] terrainTexture = new SplatPrototype[1];
17. terrainTexture[0] = new SplatPrototype();
18. terrainTexture[0].texture = (Texture2D)Resources.Load("Terrain Assets/Terrain Textures/Grass (Hill)");
19. _terrainData.splatPrototypes = terrainTexture;
20.  
21.         //Create a terrain with the set terrain data
22.         GameObject _terrain = Terrain.CreateTerrainGameObject(_terrainData);
23.     }
24.    
25.     // Update is called once per frame
26.     void Update () {
27.  
28.     }
29. }
30.  

I create the splatmap, load the texture, how is it then applied?

I understand that I will need to ultimately have more than one texture and itterate through the heightmap (something like below) to apply the textures but a little clue as to just how to see a single texture on my terrain is what I need right now. How is this done?

Code (csharp):

1. float[,,] map = new float[_terrainData.alphamapWidth, _terrainData.alphamapHeight, 2];
2.  
3.  
4.         // For each point on the alphamap...
5.         for (var y = 0; y < _terrainData.alphamapHeight; y++) {
6.            
7.            
8.             //print("Y = " + y.ToString());
9.            
10.            
11.             for (var x = 0; x < _terrainData.alphamapWidth; x++) {
12.                 // Get the normalized terrain coordinate that
13.                 // corresponds to the the point.
14.                 var normX = x * 1.0 / (_terrainData.alphamapWidth - 1);
15.                 var normY = y * 1.0 / (_terrainData.alphamapHeight - 1);
16.                
17.                
18.                 //print("X = " + normX.ToString());
19.                
20.                 // Get the steepness value at the normalized coordinate.
21.                 var angle = _terrainData.GetSteepness(normX, normY);
22.                
23.                 // Steepness is given as an angle, 0..90 degrees. Divide
24.                 // by 90 to get an alpha blending value in the range 0..1.
25.                 //var frac = angle / 90.0;
26.                 //map[x, y, 0] = frac;
27.                 //map[x, y, 1] = 1 - frac;
28.             }
29.         }
30.  
31. _terrainData.SetAlphamaps(0, 0, map);

 

You are only using 1 splatmap so the third array size of map needs to be 1
There value used should be 1 as well because you want your grass texture to show every were.

Try this, havnt tested it so sorry if it doesnt work.

Code (csharp):

1.  
2.  
3. float[,,] map = new float[_terrainData.alphamapWidth, _terrainData.alphamapHeight, 1]; // needs to be 1
4.      
5.      
6.             // For each point on the alphamap...
7.             for (var y = 0; y < _terrainData.alphamapHeight; y++) {
8.  
9.                 for (var x = 0; x < _terrainData.alphamapWidth; x++) {
10.    
11.                     map[x, y, 0] = 1.0; //needs to be 1 as well
12.                 }
13.             }
14.      
15.     _terrainData.SetAlphamaps(0, 0, map);
16.  
17.  

 

I have tried your suggest and still I see nothing.

Isn't there a way to just apply the loaded texture without iterating through the alphamap width and height?
Perhaps my texture load is incorrect - how do I test that the texture is indeed loading?
What should the map alphamap array look like - can somebody just post an array to show me how it's structured?

Can't believe how poor the documentation is on this.

Code (csharp):

1. using UnityEngine;
2. using System.Collections;
3. using Utility;
4.  
5. public class test : MonoBehaviour
6. {
7.     //use this for initialization
8.     void Start ()
9.     {
10.         //create a new terrain data
11.         TerrainData _terrainData = new TerrainData();
12.  
13.         //set terrain width, height, length
14.         _terrainData.size = new Vector3(20, 1, 20);
15.  
16.  
17.         SplatPrototype[] terrainTexture = new SplatPrototype[1];
18.         terrainTexture[0] = new SplatPrototype();
19.         terrainTexture[0].texture = (Texture2D)Resources.Load("Terrain Assets/Terrain Textures/Grass (Hill)");
20.         _terrainData.splatPrototypes = terrainTexture;
21.  
22.  
23.  
24. //PLEASE IGNORE THIS - AT THE MOMENT THIS IS JUST ADDING COMPLEXITY I DO NOT NEED
25. //HOW DO I APPLY THE TEXTURE LOADED ABOVE EVERYWHERE?
26. float[,,] map = new float[_terrainData.alphamapWidth, _terrainData.alphamapHeight, 1]; // needs to be 1
27.  
28. // For each point on the alphamap...
29. for (var y = 0; y < _terrainData.alphamapHeight; y++)
30. {
31.     for (var x = 0; x < _terrainData.alphamapWidth; x++)
32.     {
33.  
34.         map[x, y, 0] = (float)1.0; //needs to be 1 as well
35.     }
36. }
37.  
38. _terrainData.SetAlphamaps(0, 0, map);
39. //PLEASE IGNORE THIS - AT THE MOMENT THIS IS JUST ADDING COMPLEXITY I DO NOT NEED
40. //HOW DO I APPLY THE TEXTURE LOADED ABOVE EVERYWHERE?
41.  
42.  
43.  
44.         //Create a terrain with the set terrain data
45.         GameObject _terrain = Terrain.CreateTerrainGameObject(_terrainData);
46.  
47.     }
48.    
49.     // Update is called once per frame
50.     void Update () {
51.  
52.     }
53.    
54. }
55.  

 

I know this was some time ago, but Resources.Load requires that your texture be in a 'Resources' directory (it can have any path up until the 'Resources' directory). And it looks like you are trying to load it from a different path.