private void InitializeVertices()
{
var vertices = new List <VertexPositionColorNormal>();
foreach (var t in Tiles)
{
int startingVerticesLength = vertices.Count;
// "0-level" tiles (bottom)
for (int j = 0; j < t.Corners.Length - 2; ++j)
{
Vector3 a = new Vector3(t.Corners[j + 2].X * Radius, t.Corners[j + 2].Y * Radius, t.Corners[j + 2].Z * Radius);
Vector3 b = new Vector3(t.Corners[j + 1].X * Radius, t.Corners[j + 1].Y * Radius, t.Corners[j + 1].Z * Radius);
Vector3 c = new Vector3(t.Corners[0].X * Radius, t.Corners[0].Y * Radius, t.Corners[0].Z * Radius);
Vector3 normA = t.Corners[j + 2].V.ToVector3();
Vector3 normB = t.Corners[j + 1].V.ToVector3();
Vector3 normC = t.Corners[0].V.ToVector3();
vertices.Add(CreateVertex(a, normA, t.Height));
vertices.Add(CreateVertex(b, normB, t.Height));
vertices.Add(CreateVertex(c, normC, t.Height));
}
// "Raised" tiles (top)
float height = t.IsWater ? (float)(Radius + WaterHeight * GroundHeight) : (float)(Radius + t.Height * GroundHeight);
for (int j = 0; j < t.Corners.Length - 2; ++j)
{
vertices.Add(CreateVertex(new Vector3(t.Corners[j + 2].X * height, t.Corners[j + 2].Y * height, t.Corners[j + 2].Z * height), t));
vertices.Add(CreateVertex(new Vector3(t.Corners[j + 1].X * height, t.Corners[j + 1].Y * height, t.Corners[j + 1].Z * height), t));
vertices.Add(CreateVertex(new Vector3(t.Corners[0].X * height, t.Corners[0].Y * height, t.Corners[0].Z * height), t));
}
// Sides of raised tiles
for (int i = 0; i < t.Corners.Length; ++i)
{
// Two points of "0-level" edge
var a1 = new Vector3(t.Corners[i].X * Radius, t.Corners[i].Y * Radius, t.Corners[i].Z * Radius);
var a2 = new Vector3(t.Corners[(i + 1) % t.Corners.Length].X * Radius, t.Corners[(i + 1) % t.Corners.Length].Y * Radius, t.Corners[(i + 1) % t.Corners.Length].Z * Radius);
// Two points of "height-level" edge
var b1 = new Vector3(t.Corners[i].X * height, t.Corners[i].Y * height, t.Corners[i].Z * height);
var b2 = new Vector3(t.Corners[(i + 1) % t.Corners.Length].X * height, t.Corners[(i + 1) % t.Corners.Length].Y * height, t.Corners[(i + 1) % t.Corners.Length].Z * height);
var normal = (a2 - b1) * (a2 - a1);
normal = new Vector3(t.X, t.Y, t.Z);
normal.Normalize();
vertices.Add(CreateVertex(b1, normal, t.Height));
vertices.Add(CreateVertex(a2, normal, t.Height));
vertices.Add(CreateVertex(a1, normal, t.Height));
vertices.Add(CreateVertex(b1, normal, t.Height));
vertices.Add(CreateVertex(b2, normal, t.Height));
vertices.Add(CreateVertex(a2, normal, t.Height));
}
t.VerticeIndices = Enumerable.Repeat(startingVerticesLength, vertices.Count - startingVerticesLength).Select((value, index) => value + index).ToArray();
t.TopHexVerticeIndices = t.VerticeIndices.Skip((t.Corners.Length - 2) * 3).Take((t.Corners.Length - 2) * 3).ToArray();
t.BoundingBox = BoundingBox.CreateFromPoints(t.TopHexVerticeIndices.Select(vi => vertices[vi].Position));
}
_intersectionChecker = IntersectionCheckNode.CreateFromTiles(Tiles, Radius + GroundHeight);
_vertices = vertices.ToArray();
}