/// <summary>
/// Génère un modèle 3D à partir d'une heightmap.
/// Range : [0, 1]
/// </summary>
/// <param name="heightmap"></param>
/// <returns></returns>
public static void GenerateVertexBufferWithTransformFlat(float[,] heightmap, out SlimDX.Direct3D11.Buffer vBuffer,
out SlimDX.Direct3D11.Buffer iBuffer, Matrix transform, Vector2 initialGridPos, float gridLevelScale)
{
// Taille du buffer.
int size = heightmap.GetLength(0) * heightmap.GetLength(1);
// Création du vertex buffer contenant tous les vertex à dessiner.
Vertex[] vertexBuffer = new Vertex[size];
Noise.RidgedMultifractalNoise noise = new Noise.RidgedMultifractalNoise()
{
Frequency = 0.00400f,
Lacunarity = 2.4f,
OctaveCount = 2,
Persistence = 0.9f,
Quality = Noise.NoiseBase.NoiseQuality.QUALITY_FAST,
Seed = 56549970
};
for (int y = 0; y < heightmap.GetLength(1); y++)
{
for (int x = 0; x < heightmap.GetLength(0); x++)
{
Vector2 pos2D = new Vector2(x / ((float)heightmap.GetLength(0) - 1),
(y / ((float)heightmap.GetLength(1) - 1)));
Vector4 pos = Vector4.Transform(new Vector4(pos2D.X, pos2D.Y, heightmap[x, y], 1.0f), transform);
vertexBuffer[(x + y * heightmap.GetLength(0))].Position = pos;
vertexBuffer[(x + y * heightmap.GetLength(0))].Texture = new Vector2(pos.X, pos.Y);
float texGen = noise.GetValue(pos.X, pos.Y, 0);
vertexBuffer[(x + y * heightmap.GetLength(0))].TextureId = texGen;
}
}
//Thread.Sleep(1);
// Index buffer contenant l'ordre dans lequel dessiner les vertex. (sous forme de carrés).
int iBufferSize = (heightmap.GetLength(0) - 1) * (heightmap.GetLength(1) - 1) * 6;
int[] indexBuffer = new int[iBufferSize];
int sizeX = heightmap.GetLength(0);
int sizeY = heightmap.GetLength(1);
int startIndex = 0;
for (int x = 0; x < sizeX - 1; x++)
{
for (int y = 0; y < sizeY - 1; y++)
{
int firstIndex = x + y * (sizeX);
int topLeft = firstIndex;
int topRight = firstIndex + 1;
int lowerLeft = topLeft + sizeX;
int lowerRight = lowerLeft + 1;
// Triangle 1 (up right)
indexBuffer[startIndex++] = topLeft;
indexBuffer[startIndex++] = lowerRight;
indexBuffer[startIndex++] = lowerLeft;
// Triangle 2 (bottom left)
indexBuffer[startIndex++] = topLeft;
indexBuffer[startIndex++] = topRight;
indexBuffer[startIndex++] = lowerRight;
}
}
//Thread.Sleep(1);
// Calcule les normales aux surfaces.
// Merci Riemer's XNA Tutorial :D
for (int i = 0; i < vertexBuffer.Length; i++)
vertexBuffer[i].Normal = new Vector4(0, 0, 0, 0);
//Thread.Sleep(1);
for (int i = 0; i < indexBuffer.Length / 3; i++)
{
Vector4 firstvec = vertexBuffer[indexBuffer[i * 3 + 1]].Position - vertexBuffer[indexBuffer[i * 3]].Position;
Vector4 secondvec = vertexBuffer[indexBuffer[i * 3]].Position - vertexBuffer[indexBuffer[i * 3 + 2]].Position;
Vector4 normal = new Vector4(Vector3.Cross(
new Vector3(firstvec.X, firstvec.Y, firstvec.Z),
new Vector3(secondvec.X, secondvec.Y, secondvec.Z)), 1.0f);
normal.Normalize();
vertexBuffer[indexBuffer[(i * 3)]].Normal += normal;
vertexBuffer[indexBuffer[(i * 3 + 1)]].Normal += normal;
vertexBuffer[indexBuffer[(i * 3 + 2)]].Normal += normal;
}
//Thread.Sleep(1);
for (int i = 0; i < vertexBuffer.Length; i++)
{
vertexBuffer[i].Normal.Z = vertexBuffer[i].Normal.Z;
var v = Util.MathHelper.ReduceXYZ(vertexBuffer[i].Normal);
v.Normalize();
vertexBuffer[i].Normal = new Vector4(v, 1.0f);
}
//Thread.Sleep(1);
DataStream vBuffStream = new DataStream(size * Vertex.Stride, true, true);
vBuffStream.WriteRange<Vertex>(vertexBuffer);
vBuffStream.Position = 0;
//Thread.Sleep(1);
DataStream iBuffStream = new DataStream(iBufferSize * sizeof(int), true, true);
iBuffStream.WriteRange<int>(indexBuffer);
iBuffStream.Position = 0;
//Thread.Sleep(1);
vBuffer = new SlimDX.Direct3D11.Buffer(Scene.GetGraphicsDevice(), vBuffStream, new BufferDescription()
{
BindFlags = BindFlags.VertexBuffer,
CpuAccessFlags = CpuAccessFlags.None,
OptionFlags = ResourceOptionFlags.None,
SizeInBytes = (int)vBuffStream.Length,
Usage = ResourceUsage.Default
});
iBuffer = new SlimDX.Direct3D11.Buffer(Scene.GetGraphicsDevice(), iBuffStream, new BufferDescription()
{
BindFlags = BindFlags.IndexBuffer,
CpuAccessFlags = CpuAccessFlags.None,
OptionFlags = ResourceOptionFlags.None,
SizeInBytes = (int)iBuffStream.Length,
Usage = ResourceUsage.Default
});
vBuffStream.Dispose();
iBuffStream.Dispose();
}
/// <summary>
/// Génère un modèle 3D à partir d'une heightmap.
/// Range : [0, 1]
/// </summary>
/// <param name="heightmap"></param>
/// <returns></returns>
public static void GenerateVertexBufferWithTransformFlat(float[,] heightmap, out SlimDX.Direct3D11.Buffer vBuffer,
out SlimDX.Direct3D11.Buffer iBuffer, Matrix transform, Vector2 initialGridPos, float gridLevelScale)
{
// Taille du buffer.
int size = heightmap.GetLength(0) * heightmap.GetLength(1);
// Création du vertex buffer contenant tous les vertex à dessiner.
Vertex[] vertexBuffer = new Vertex[size];
Noise.RidgedMultifractalNoise noise = new Noise.RidgedMultifractalNoise()
{
Frequency = 0.00400f,
Lacunarity = 2.4f,
OctaveCount = 2,
Persistence = 0.9f,
Quality = Noise.NoiseBase.NoiseQuality.QUALITY_FAST,
Seed = 56549970
};
for (int y = 0; y < heightmap.GetLength(1); y++)
{
for (int x = 0; x < heightmap.GetLength(0); x++)
{
Vector2 pos2D = new Vector2(x / ((float)heightmap.GetLength(0) - 1),
(y / ((float)heightmap.GetLength(1) - 1)));
Vector4 pos = Vector4.Transform(new Vector4(pos2D.X, pos2D.Y, heightmap[x, y], 1.0f), transform);
vertexBuffer[(x + y * heightmap.GetLength(0))].Position = pos;
vertexBuffer[(x + y * heightmap.GetLength(0))].Texture = new Vector2(pos.X, pos.Y);
float texGen = noise.GetValue(pos.X, pos.Y, 0);
vertexBuffer[(x + y * heightmap.GetLength(0))].TextureId = texGen;
}
}
//Thread.Sleep(1);
// Index buffer contenant l'ordre dans lequel dessiner les vertex. (sous forme de carrés).
int iBufferSize = (heightmap.GetLength(0) - 1) * (heightmap.GetLength(1) - 1) * 6;
int[] indexBuffer = new int[iBufferSize];
int sizeX = heightmap.GetLength(0);
int sizeY = heightmap.GetLength(1);
int startIndex = 0;
for (int x = 0; x < sizeX - 1; x++)
{
for (int y = 0; y < sizeY - 1; y++)
{
int firstIndex = x + y * (sizeX);
int topLeft = firstIndex;
int topRight = firstIndex + 1;
int lowerLeft = topLeft + sizeX;
int lowerRight = lowerLeft + 1;
// Triangle 1 (up right)
indexBuffer[startIndex++] = topLeft;
indexBuffer[startIndex++] = lowerRight;
indexBuffer[startIndex++] = lowerLeft;
// Triangle 2 (bottom left)
indexBuffer[startIndex++] = topLeft;
indexBuffer[startIndex++] = topRight;
indexBuffer[startIndex++] = lowerRight;
}
}
//Thread.Sleep(1);
// Calcule les normales aux surfaces.
// Merci Riemer's XNA Tutorial :D
for (int i = 0; i < vertexBuffer.Length; i++)
{
vertexBuffer[i].Normal = new Vector4(0, 0, 0, 0);
}
//Thread.Sleep(1);
for (int i = 0; i < indexBuffer.Length / 3; i++)
{
Vector4 firstvec = vertexBuffer[indexBuffer[i * 3 + 1]].Position - vertexBuffer[indexBuffer[i * 3]].Position;
Vector4 secondvec = vertexBuffer[indexBuffer[i * 3]].Position - vertexBuffer[indexBuffer[i * 3 + 2]].Position;
Vector4 normal = new Vector4(Vector3.Cross(
new Vector3(firstvec.X, firstvec.Y, firstvec.Z),
new Vector3(secondvec.X, secondvec.Y, secondvec.Z)), 1.0f);
normal.Normalize();
vertexBuffer[indexBuffer[(i * 3)]].Normal += normal;
vertexBuffer[indexBuffer[(i * 3 + 1)]].Normal += normal;
vertexBuffer[indexBuffer[(i * 3 + 2)]].Normal += normal;
}
//Thread.Sleep(1);
for (int i = 0; i < vertexBuffer.Length; i++)
{
vertexBuffer[i].Normal.Z = vertexBuffer[i].Normal.Z;
var v = Util.MathHelper.ReduceXYZ(vertexBuffer[i].Normal);
v.Normalize();
vertexBuffer[i].Normal = new Vector4(v, 1.0f);
}
//Thread.Sleep(1);
DataStream vBuffStream = new DataStream(size * Vertex.Stride, true, true);
vBuffStream.WriteRange <Vertex>(vertexBuffer);
vBuffStream.Position = 0;
//Thread.Sleep(1);
DataStream iBuffStream = new DataStream(iBufferSize * sizeof(int), true, true);
iBuffStream.WriteRange <int>(indexBuffer);
iBuffStream.Position = 0;
//Thread.Sleep(1);
vBuffer = new SlimDX.Direct3D11.Buffer(Scene.GetGraphicsDevice(), vBuffStream, new BufferDescription()
{
BindFlags = BindFlags.VertexBuffer,
CpuAccessFlags = CpuAccessFlags.None,
OptionFlags = ResourceOptionFlags.None,
SizeInBytes = (int)vBuffStream.Length,
Usage = ResourceUsage.Default
});
iBuffer = new SlimDX.Direct3D11.Buffer(Scene.GetGraphicsDevice(), iBuffStream, new BufferDescription()
{
BindFlags = BindFlags.IndexBuffer,
CpuAccessFlags = CpuAccessFlags.None,
OptionFlags = ResourceOptionFlags.None,
SizeInBytes = (int)iBuffStream.Length,
Usage = ResourceUsage.Default
});
vBuffStream.Dispose();
iBuffStream.Dispose();
}
