void generate(object ctx)
{
building = true;
List<int> inds = new List<int>(Icosphere.Indicies);
List<VertexPositionColorNormal> verts = new List<VertexPositionColorNormal>();
for (int i = 0; i < Icosphere.Verticies.Length; i++) {
verts.Add(new VertexPositionColorNormal(Icosphere.Verticies[i] / Icosphere.Verticies[i].Length(), Icosphere.Verticies[i], landColor));
}
IndexBuffer = new Dictionary<int, int[]>();
IndexBuffer[0] = inds.ToArray();
LODv = new List<int>();
LODv.Add(verts.Count);
int levels = (int)ctx;
for (int l = 1; l < levels; l++) {
List<int> newinds = new List<int>();
for (int i = 0; i < inds.Count; i+=3) {
int i1 = inds[i], i2 = inds[i + 1], i3 = inds[i + 2];
Vector3 v1 = verts[i1].Position, v2 = verts[i2].Position, v3 = verts[i3].Position;
Vector3 v4 = (v1 + v3) / 2f;
Vector3 v5 = (v1 + v2) / 2f;
Vector3 v6 = (v3 + v2) / 2f;
v4.Normalize(); v5.Normalize(); v6.Normalize();
verts.Add(new VertexPositionColorNormal(v4, v4, landColor));
verts.Add(new VertexPositionColorNormal(v5, v5, landColor));
verts.Add(new VertexPositionColorNormal(v6, v6, landColor));
int i4 = verts.Count - 3;
int i5 = verts.Count - 2;
int i6 = verts.Count - 1;
newinds.AddRange(new int[] { i1, i5, i4 });
newinds.AddRange(new int[] { i4, i5, i6 });
newinds.AddRange(new int[] { i3, i4, i6 });
newinds.AddRange(new int[] { i6, i5, i2 });
}
inds = new List<int>(newinds);
IndexBuffer[l] = inds.ToArray();
LODv.Add(verts.Count);
}
VertexBuffer = verts.ToArray();
if (HasWater)
WaterVertexBuffer = new VertexPositionColorPolar[VertexBuffer.Length];
if (HasAtmosphere)
AtmosphereVertexBuffer = new VertexPositionColorNormal[VertexBuffer.Length];
// set terrain heights
for (int i = 0; i < VertexBuffer.Length; i++) {
// water verts
if (HasWater){
WaterVertexBuffer[i] = new VertexPositionColorPolar(VertexBuffer[i].Position, Vector2.Zero, waterColor);
WaterVertexBuffer[i].Polar.X = (float)Math.Asin(WaterVertexBuffer[i].Position.Z);
WaterVertexBuffer[i].Polar.Y = (float)Math.Atan2(WaterVertexBuffer[i].Position.Y, WaterVertexBuffer[i].Position.X);
WaterVertexBuffer[i].Position *= Radius;
}
// atmo verts
if (HasAtmosphere) {
AtmosphereVertexBuffer[i] = new VertexPositionColorNormal(VertexBuffer[i].Position, VertexBuffer[i].Position, atmosphereColor);
AtmosphereVertexBuffer[i].Normal.Normalize();
AtmosphereVertexBuffer[i].Position *= AtmosphereHeight;
}
// land verts
VertexBuffer[i].Color = landColor;
float h = getHeight(VertexBuffer[i].Position);
if (h <= Radius)
VertexBuffer[i].Color = oceanFloorColor;
VertexBuffer[i].Position *= h;
VertexBuffer[i].Normal = Vector3.Zero;
}
for (int i = 0; i < IndexBuffer[levels - 1].Length; i+=3) {
int i1 = IndexBuffer[levels - 1][i];
int i2 = IndexBuffer[levels - 1][i + 1];
int i3 = IndexBuffer[levels - 1][i + 2];
Vector3 norm = -Vector3.Cross(VertexBuffer[i1].Position - VertexBuffer[i2].Position, VertexBuffer[i1].Position - VertexBuffer[i3].Position);
VertexBuffer[i1].Normal += norm;
VertexBuffer[i2].Normal += norm;
VertexBuffer[i3].Normal += norm;
}
for (int i = 0; i < VertexBuffer.Length; i++)
VertexBuffer[i].Normal.Normalize();
if (HasWater){
waves[0] = new Wave(.5f, 2, Vector2.UnitX, 50, 1f);
waves[1] = new Wave(.2f, 2, Vector2.UnitY, 50, .2f);
}
built = true;
building = false;
}