public static void ChangeTexture(int startX, int startY, int sizeX, int sizeY, TerrainTextureType tp, float randMin, float randMax)
{
Vector3 worldPos = Grid.ToWorld(startX, startY);
worldPos -= new Vector3(0.5f, 0, 0.5f) * Grid.SCALE;
sizeX *= 2;
sizeY *= 2;
/*if (sizeX == 2)
* {
* sizeX = 3;
* worldPos -= new Vector3(0.25f, 0, 0) * Grid.SCALE;
* }
* if (sizeY == 2)
* {
* sizeY = 3;
* worldPos -= new Vector3(0, 0, 0.25f) * Grid.SCALE;
* }*/
int tex = 0;
switch (tp)
{
case TerrainTextureType.Grass: tex = 0; break;
case TerrainTextureType.Path: tex = 1; break;
case TerrainTextureType.Field: tex = 5; break;
case TerrainTextureType.Building: tex = 2; break;
}
// calculate which splat map cell the worldPos falls within (ignoring y)
int mapX = (int)(((worldPos.x - terrainPos.x) / terrainData.size.x) * terrainData.alphamapWidth);
int mapZ = (int)(((worldPos.z - terrainPos.z) / terrainData.size.z) * terrainData.alphamapHeight);
// get the splat data for this cell as a 1x1xN 3d array (where N = number of textures)
float[,,] splatmapData = terrainData.GetAlphamaps(mapX, mapZ, sizeX, sizeY);
float spW = splatmapData.GetLength(0);
float spH = splatmapData.GetLength(1);
float midX = spW / 2 - 0.5f;
float midY = spH / 2 - 0.5f;
float maxR = midX * midX + midY * midY;
for (int x = 0; x < spW; x++)
{
for (int y = 0; y < spH; y++)
{
float randPx = Random.Range(randMin, randMax);
for (int i = 0; i < splatmapData.GetLength(2); i++)
{
float r = (midX - x) * (midX - x) + (midY - y) * (midY - y);
float alpha = 1f - (r / maxR);
alpha += randPx;
if (spW <= 2)
{
alpha = 0.5f;
}
if (i == 0)
{
alpha = 1f - alpha;
}
else if (i != tex)
{
alpha = 0;
}
splatmapData[x, y, i] = alpha;
}
}
}
terrainData.SetAlphamaps(mapX, mapZ, splatmapData);
//terrain.Flush();
}
public static void ChangeTexture(int startX, int startY, int sizeX, int sizeY, TerrainTextureType tp)
{
ChangeTexture(startX, startY, sizeX, sizeY, tp, 0, 0);
}