Run-time terrains

Unity Engine
1

I’ve spent hours trying to figure out how to add run-time terrain objects. I briefly succeeded in producing a small terrain that appeared in the right spot, but during my attempt to find a way to change the heightmap resolution the terrain no longer showed up, and I haven’t been able to get it to display again after figuring out how to change the resolution.
Here are the crucial parts of my code (from a function that generates the terrain at runtime). I’m hoping someone can tell me what I’m doing wrong:

var TerrainChunk1Data: TerrainData = new TerrainData();
TerrainChunk1Data.heightmapResolution = TerrHtMapRes;
TerrainChunk1Data.size = Vector3(TerrainChunkWidth,TerrainChunkHeight,TerrainChunkLength);
var TCHtMap:float[,] = new float[TerrHtMapRes,TerrHtMapRes];
//fill in the heighmap with a test pattern of all 5s
for (var y:int=0; y<TerrHtMapRes;y++)
{
for (var x:int=0; x<TerrHtMapRes;x++)
{
TCHtMap[y,x] = 5.0;
}
}
TerrainChunk1Data.SetHeights(0, 0, TCHtMap);
var TerrainChunk1Obj = Terrain.CreateTerrainGameObject(TerrainChunk1Data);
TerrainChunk1Obj .transform.position = Vector3(-13,-15,-107);

2 
function Start ()
{
	var data:TerrainData = new TerrainData();
	data.heightmapResolution = 512; 
	data.size = Vector3(2000.0,1.0,2000); 
	var TCHtMap:float[,] = new float[512,512]; 

	for (var y:int=0; y<512;y++)
	{
		for (var x:int=0; x<512;x++)
		{
			TCHtMap[y,x] = Random.Range(0.0, 4.0);
		} 
	}	
	data.SetHeights(0, 0, TCHtMap); 
	var newTerrain:GameObject = Terrain.CreateTerrainGameObject(data) ; 
	newTerrain.transform.position = Vector3(-4,-15,-120);
}

my advice is also to use simple naming in your scripts, don’t make things more complicated then they are.

3

That works. Many thanks.

4

The problem with my previous code was that the heightmap resolution was a power of two plus one (33, 129, etc), which is what the documentation and code examples said to use. Appels’ code uses just a power of two (512). Is there a mistake in the documentation? For example, look at the following terrain tutorial and scroll down to the heading “Heightmap Resolution” - http://www.unifycommunity.com/wiki/index.php?title=Terrain_tutorial

5

The heightmap resolution should be power of two plus one. Also, heights are normalized floats between 0 and 1.

–Eric

6

Ok, I guess a power of two plus one does work… my height values had been the problem then (5 instead of < 1.0)

7

yes exactly like Eric said, it should be power off 2 + 1 and the heights between 0 and 1.
i was messing with the script and forgot to correct it before posting.