/// <summary>
/// Initializes mesh with new value.
/// Unless the heightmap is small, it won't all fit into a single MeshBuffer.
/// This function chops it into pieces and generates a buffer from each one.
/// </summary>
public void Init(VideoDriver driver, HeightMap map, float s, ColorFunc cf)
{
width = map.Width;
height = map.Height;
scale = s;
if (Mesh.MeshBufferCount > 0)
Mesh.RemoveMeshBuffer(0, Mesh.MeshBufferCount);
int sw = 0xffff / (height + 1); // maximum vertices per meshbuffer
for (int y0 = 0; y0 < height; y0 += sw)
{
int y1 = y0 + sw;
if (y1 >= height)
y1 = height - 1; // the last one might be narrower
addStrip(map, cf, y0, y1);
}
Mesh.RecalculateBoundingBox();
}
/// <summary>
/// Generates a MeshBuffer which represents all the vertices and indices for values of y
/// between y0 and y1, and add it to the mesh.
/// </summary>
void addStrip(HeightMap map, ColorFunc cf, int y0, int y1)
{
Vertex3D[] vertices = new Vertex3D[(y1 - y0 + 1) * width];
ushort[] indices = new ushort[(y1 - y0) * (width - 1) * 6]; // "6" is a number of indices in 2 triangles (which forms a quad)
// calculate vertices
int i = 0;
for (int y = y0; y <= y1; ++y)
{
for (int x = 0; x < width; ++x)
{
float z = map.GetHeight(x, y);
float xf = (float)x / (float)width;
float yf = (float)y / (float)height;
vertices[i++] = new Vertex3D(
new Vector3Df(x, scale * z, y), // position
map.GetNormal(x, y, scale), // normal
calculate(cf, xf, yf, z), // color
new Vector2Df(xf, yf) // tcoords
);
}
}
// calculate indices
i = 0;
for (int y = y0; y < y1; ++y)
{
for (int x = 0; x < width - 1; ++x)
{
int n = (y - y0) * width + x;
indices[i++] = (ushort)n;
indices[i++] = (ushort)(n + width);
indices[i++] = (ushort)(n + width + 1);
indices[i++] = (ushort)(n + width + 1);
indices[i++] = (ushort)(n + 1);
indices[i++] = (ushort)n;
}
}
// append calculated verices and indices to mesh buffer
MeshBuffer buf = MeshBuffer.Create(VertexType.Standard, IndexType._16Bit); // create new buffer
Mesh.AddMeshBuffer(buf);
buf.Append(vertices, indices);
buf.RecalculateBoundingBox();
buf.Drop();
}
static void Main(string[] args)
{
DriverType driverType;
if (!AskUserForDriver(out driverType))
return;
IrrlichtDevice device = IrrlichtDevice.CreateDevice(driverType, new Dimension2Di(800, 600));
if (device == null)
return;
device.OnEvent += new IrrlichtDevice.EventHandler(device_OnEvent);
device.SetWindowCaption("Mesh handling - Irrlicht Lime");
VideoDriver driver = device.VideoDriver;
SceneManager scene = device.SceneManager;
// Generate starting height map and mesh
HeightMap map = new HeightMap(255, 255);
map.Generate(HeightMap.HeightFunc.EggBox);
HeightMesh mesh = new HeightMesh();
mesh.Init(driver, map, 50.0f, HeightMesh.ColorFunc.GreyscaleBasedOnTheHeight);
// Add the mesh to the scene graph
MeshSceneNode meshnode = scene.AddMeshSceneNode(mesh.Mesh);
meshnode.SetMaterialFlag(MaterialFlag.BackFaceCulling, false);
// Add light (just for nice effects)
LightSceneNode lightnode = scene.AddLightSceneNode(null, new Vector3Df(0, 100, 0), new Colorf(1, 1, 1), 500.0f);
SceneNodeAnimator anim = scene.CreateFlyCircleAnimator(new Vector3Df(0, 150, 0), 250.0f);
lightnode.AddAnimator(anim);
anim.Drop();
// Add camera
CameraSceneNode camera = scene.AddCameraSceneNodeFPS();
camera.Position = new Vector3Df(-20.0f, 100.0f, -20.0f);
camera.Target = new Vector3Df(200.0f, -100.0f, 200.0f);
camera.FarValue = 20000.0f;
// Main loop
while (device.Run())
{
if (!device.WindowActive)
{
device.Sleep(100);
continue;
}
if (IsKeyDown(KeyCode.KeyW))
{
meshnode.SetMaterialFlag(MaterialFlag.Wireframe, !meshnode.GetMaterial(0).Wireframe);
}
else if (IsKeyDown(KeyCode.Key1))
{
map.Generate(HeightMap.HeightFunc.EggBox);
mesh.Init(driver, map, 50.0f, HeightMesh.ColorFunc.GreyscaleBasedOnTheHeight);
}
else if (IsKeyDown(KeyCode.Key2))
{
map.Generate(HeightMap.HeightFunc.MoreSine);
mesh.Init(driver, map, 50.0f, HeightMesh.ColorFunc.CoordinateInterpolation);
}
else if (IsKeyDown(KeyCode.Key3))
{
map.Generate(HeightMap.HeightFunc.JustExp);
mesh.Init(driver, map, 50.0f, HeightMesh.ColorFunc.CoordinateInterpolation);
}
driver.BeginScene();
scene.DrawAll();
driver.EndScene();
}
// Clean up
mesh.Drop();
device.Drop();
}
