public void InitializeClusters()
{
clusters.Clear();
List<TriangleGraph> availableTriangles;
if (scene.MainTerrain.GetTrianglesInRegion(RandomHelper.RandomGen, out availableTriangles, region))
{
for (int i = 0; i < clusterSize; i++)
{
Material mat = materials[RandomHelper.RandomGen.Next(materials.Count)];
if (!clusters.ContainsKey(mat))
{
clusters.Add(mat, new List<Cluster>());
}
int randomIndex = RandomHelper.RandomGen.Next(i % availableTriangles.Count, availableTriangles.Count);
TriangleGraph triangle = availableTriangles[randomIndex];
Vector3 position = triangle.GeneratePointInTriangle(RandomHelper.RandomGen);
Vector3 normal = triangle.Normal;
//position = Vector3.Transform(position, scene.MainTerrain.Transformation.GetTransform());
Cluster cluster = new Cluster();
RandomizeOrientation(cluster, position, normal);
clusters[mat].Add(cluster);
}
}
}
void RandomizeOrientation(Cluster cluster, Vector3 position, Vector3 surfaceNormal)
{
cluster.Transform = new Matrix[randomHelper.Next(minSides, maxSides)];
cluster.Bounds.Min = Vector3.One * float.PositiveInfinity;
cluster.Bounds.Max = Vector3.One * float.NegativeInfinity;
for (int i = 0; i < cluster.Transform.Length; i++)
{
Vector3 randScale = Vector3.Lerp(minScale, maxScale, (float)randomHelper.NextDouble());
float randAngle = MathHelper.TwoPi * (float)randomHelper.NextDouble();
cluster.Transform[i] = Matrix.CreateScale(randScale) * Matrix.CreateFromAxisAngle(surfaceNormal, randAngle);
cluster.Transform[i].Translation = position + surfaceNormal*0.5f;
Vector3 min = Vector3.Transform(new Vector3(-1,-1,0), cluster.Transform[i]);
Vector3 max = Vector3.Transform(new Vector3(1, 1, 0), cluster.Transform[i]);
cluster.Bounds.Min = Vector3.Min(min, cluster.Bounds.Min);
cluster.Bounds.Max = Vector3.Max(max, cluster.Bounds.Max);
}
}
void RandomizeOrientation(Cluster cluster, Vector3 position, Vector3 surfaceNormal)
{
cluster.Transform = new Matrix[RandomHelper.RandomGen.Next(minSides, maxSides)];
Vector3 randScale = Vector3.Lerp(minScale, maxScale, (float)RandomHelper.RandomGen.NextDouble());
cluster.Bounds.Min = Vector3.One * float.PositiveInfinity;
cluster.Bounds.Max = Vector3.One * float.NegativeInfinity;
Vector3 fwd = new Vector3(surfaceNormal.Z, surfaceNormal.X, surfaceNormal.Y);
fwd = Vector3.Normalize(fwd - Vector3.Dot(fwd, surfaceNormal) * surfaceNormal);
Vector3 right = Vector3.Cross(fwd, surfaceNormal);
for (int i = 0; i < cluster.Transform.Length; i++)
{
float randAngle = MathHelper.TwoPi * (float)RandomHelper.RandomGen.NextDouble();
Matrix orientation = Matrix.Identity;
orientation.Up = surfaceNormal;
orientation.Right = right;// Vector3.Normalize(new Vector3(normal.Z, normal.X, normal.Y));
orientation.Forward = fwd;// Vector3.Normalize(Vector3.Cross(worldMatrix.Up, worldMatrix.Right));
//orientation *= Matrix.CreateFromAxisAngle(surfaceNormal, randAngle);
cluster.Transform[i] = Matrix.CreateScale(randScale) * Matrix.CreateRotationY(randAngle) * orientation;
/*
cluster.Transform[i] = Matrix.CreateRotationY(randAngle);
cluster.Transform[i].Up = surfaceNormal;
cluster.Transform[i] *= Matrix.CreateScale(randScale);
*/
cluster.Transform[i].Translation = position;// +surfaceNormal * randScale;
Vector3 min = Vector3.Transform(new Vector3(-1,-1,-0.15f), cluster.Transform[i]);
Vector3 max = Vector3.Transform(new Vector3(1, 1, 0.15f), cluster.Transform[i]);
cluster.Bounds.Min = Vector3.Min(min, cluster.Bounds.Min);
cluster.Bounds.Max = Vector3.Max(max, cluster.Bounds.Max);
}
}
void InitializeClusters()
{
for (int i = 0; i < clusterSize; i++)
{
Cluster cluster = new Cluster();
Material mat = materials[randomHelper.Next(materials.Count)];
Vector3 randPosition = Vector3.Zero;
Vector3 randNormal = Vector3.Zero;
scene.MainTerrain.GenerateRandomTransform(randomHelper, out randPosition, out randNormal);
RandomizeOrientation(cluster, randPosition, randNormal);
if (!clusters.ContainsKey(mat))
{
clusters.Add(mat, new List<Cluster>());
}
clusters[mat].Add(cluster);
}
}