Terrain Height map World Position

Unity Engine
1

So in the screen you see i have aligned some sprite objects to the terrain, now in this bit of code i try to modify the terrain heights based on position of my guide dots.

        var TD = Map.terrainData;
        var W = TD.heightmapWidth;
        var H = TD.heightmapHeight;
        Debug.Log(W);
        Debug.Log(H);
        var TH = TD.GetHeights(0, 0, W, H);

        for (int i = 0; i < TilePositions.Count; i++) // I think that all the positions exist so therefor :
        {
            int X = (int)TilePositions[i].x;
            int Z = (int)TilePositions[i].z;
           
            if (Random.Range(0, 4) == 1) // Just basic randomization of height
            {
                TH[X, Z] = 0.001f;
            }
            else
                TH[X, Z] = 0; // One of these XZ does not exist
        }
        TD.SetHeights(0, 0, TH);

I not sure i understand what exactly i am doing, or waht i am missing. But it does work for some coordinates and then stops working before covering the map.

If you can help thank you

7575793--938539--SetUp.png
7575793--938539--SetUp.png1182×573 171 KB

2

This stuff can get hairy because there are so many coordinate systems involved: world, local, terrain position, terrain normalized height, heightmap resolution, etc.

This script does it all correctly and contains decent commentary, so perhaps it can be of guidance to you:

1 Like
3

Is that a from raycast?

4

I’m not sure I understand that question. All the code is linked in the comments on the video, feel free to look around and see what it does. It’s pretty straightforward and well-commented.