public Terrain()
{
float[,] height = null;
// Load the height map
using (Bitmap bmp = (Bitmap)Bitmap.FromFile(FileResource.Fsp("heightfield.bmp")))
{
// compute scale
gridWidth = bmp.Width; // scale is determined by the size of the
gridHeight = bmp.Height; // heightfield & the size of the map
tileWidth = Map.MapWidth / bmp.Width;
tileHeight = Map.MapHeight / bmp.Height;
gridWidth = bmp.Height-1; // the grid of tiles will be 1 smaller than
gridHeight = bmp.Height-1; // the grid of heights (last height = RH side of last tile)
// Create the blank tiles
tile = new Tile[gridWidth,gridHeight];
// get heightmap into a temp array, for faster access
height = new float[bmp.Width,bmp.Height];
for (int y = 0; y<bmp.Height; y++)
{
for (int x=0; x<bmp.Width; x++)
{
/////////////////////// height[x,y] = (float)bmp.GetPixel(x,y).R / 256.0f * MAXHEIGHT;
height[x,y] = 0;
}
}
} // dispose of the bitmap
// Create the tiles and define their extents and heights
for (int y = 0; y<gridHeight; y++)
{
for (int x=0; x<gridWidth; x++)
{
tile[x,y] = new Tile(x,y,tileWidth,tileHeight,ref height);
}
}
// Now that the triangles exist, define the vertex normals, by averaging the
// surface normals of surrounding triangles
for (int y = 1; y<gridHeight-1; y++)
{
for (int x=1; x<gridWidth-1; x++)
{
Tile.SetVertexNormal(tile,x,y);
}
}
/// TODO: Load the texture map here & create the texture library,
/// then set the tile textures
// Reload resources on reset of device
Engine.Device.DeviceReset += new System.EventHandler(this.OnReset);
// Load them for the first time now
OnReset(null, null);
}
/// <summary>
/// Set the vertex normals for the triangles in this tile.
/// Each vertex normal is the average of the face normals for surrounding triangles
/// (some of which are in different tiles)
/// </summary>
/// <param name="tile">the array of tiles</param>
/// <param name="x">our location in the array</param>
/// <param name="y"></param>
public static void SetVertexNormal(Tile[,] tile, int x, int y)
{
// NW vertex
tile[x,y].mesh[0].Normal = Vector3.Normalize(
tile[x-1,y-1].FaceNormal2
+ tile[x,y-1].FaceNormal1
+ tile[x,y-1].FaceNormal2
+ tile[x,y].FaceNormal1
+ tile[x-1,y].FaceNormal2
+ tile[x-1,y].FaceNormal1
);
// NE vertex
tile[x,y].mesh[1].Normal = Vector3.Normalize(
tile[x,y-1].FaceNormal2
+ tile[x+1,y-1].FaceNormal1
+ tile[x+1,y-1].FaceNormal2
+ tile[x+1,y].FaceNormal1
+ tile[x,y].FaceNormal2
+ tile[x,y].FaceNormal1
);
// SW vertex
tile[x,y].mesh[2].Normal = Vector3.Normalize(
tile[x-1,y].FaceNormal2
+ tile[x,y].FaceNormal1
+ tile[x,y].FaceNormal2
+ tile[x,y+1].FaceNormal1
+ tile[x-1,y+1].FaceNormal2
+ tile[x-1,y+1].FaceNormal1
);
// SE vertex
tile[x,y].mesh[3].Normal = Vector3.Normalize(
tile[x,y].FaceNormal2
+ tile[x+1,y].FaceNormal1
+ tile[x+1,y].FaceNormal2
+ tile[x+1,y+1].FaceNormal1
+ tile[x,y+1].FaceNormal2
+ tile[x,y+1].FaceNormal1
);
}
