public Terrain(Device device, AssetManager assetManager, int width, int length, int maxHeight, string[] textures)
{
this.heightMap = new HeightMap(width, length, maxHeight);
CreatePatches(device);
this.materials = textures.Select((texture, i) =>
new Material("Terrain" + i)
{
Shader = assetManager.Load(@"Engine\UberShader.fx") as Shader,
DiffuseTexture = assetManager.Load(texture) as Texture
}).ToList();
this.device = device;
}
public Patch(Device device, HeightMap heightMap, int left, int top, int right, int bottom)
{
int width = right - left;
int height = bottom - top;
int numFace = (int)(width * height * 2);
int numVertex = (int)((width + 1) * (height + 1));
this.mesh = new D3D.Mesh(device.RawDevice, numFace, numVertex, 0, this.terrainFvf);
// Create terrain vertices
var vertices = this.mesh.LockVertexBuffer(D3D.LockFlags.None);
for (int z = top, z0 = 0; z <= bottom; ++z, ++z0)
{
for (int x = left, x0 = 0; x <= right; ++x, ++x0)
{
var pos = new Vector3(x, heightMap.GetHeight(x, z), z);
var uv = new Vector2(x * 0.2f, z * 0.2f);
vertices.Write(new TerrainVertex(pos, uv));
}
}
this.mesh.UnlockVertexBuffer();
// Calculate terrain indices
var indices = this.mesh.LockIndexBuffer(D3D.LockFlags.None);
for (int z = top, z0 = 0; z < bottom; ++z, ++z0)
{
for (int x = left, x0 = 0; x < right; ++x, ++x0)
{
// Triangle 1
indices.Write((short)(z0 * (width + 1) + x0));
indices.Write((short)((z0 + 1) * (width + 1) + x0));
indices.Write((short)(z0 * (width + 1) + x0 + 1));
// Triangle 2
indices.Write((short)(z0 * (width + 1) + x0 + 1));
indices.Write((short)((z0 + 1) * (width + 1) + x0));
indices.Write((short)((z0 + 1) * (width + 1) + x0 + 1));
}
}
this.mesh.UnlockIndexBuffer();
// Set attributes
var attributes = this.mesh.LockAttributeBuffer(D3D.LockFlags.None);
for (int z = top; z < bottom; ++z)
{
for (int x = left; x < right; ++x)
{
// Calculate vertices based on height
int subset;
if (heightMap.GetHeight(x, z) == 0.0f)
subset = 0;
else if (heightMap.GetHeight(x, z) <= heightMap.MaxHeight * 0.6f)
subset = 1;
else
subset = 2;
attributes.Write(subset);
attributes.Write(subset);
}
}
this.mesh.UnlockAttributeBuffer();
// Compute normal for the terrain
this.mesh.ComputeNormals();
}