private void generateCylinderMesh()
{
float h = 20.0f;
float r = 20.0f;
Vector4 p0 = new Vector4(0, h, 0, 1);
Vector4 n0 = new Vector4(0, 1, 0, 0);
int n = 30;
List <Triangle> allTriangles = new List <Triangle>();
//TOP BASE
//Triangles
Vertex [] allVertexList = new Vertex[(int)(4 * n + 2)];
allVertexList[0] = new Vertex(p0, n0);
for (int i = 1; i <= n; i++)
{
Vector4 pi = new Vector4
{
X = (float)(r * Math.Cos((2 * Math.PI / n) * (i - 1))),
Y = h,
Z = (float)(r * Math.Sin((2 * Math.PI / n) * (i - 1))),
W = 1
};
allVertexList[i] = (new Vertex(pi, n0));
}
int position = 0;
for (int i = 0; i < n; i++)
{
position = ((i + 2) % (n + 1) == 0) ? 1 : (int)((i + 2) % (n + 1));
allTriangles.Add(new Triangle(allVertexList[0], allVertexList[position],
allVertexList[i + 1]));
}
//BOTTOM BASE
allVertexList[4 * n + 1] = (new Vertex(new Vector4(0, 0, 0, 1), new Vector4(0, -1, 0, 0)));
for (int i = 3 * n + 1; i < 4 * n + 1; ++i)
{
allVertexList[i] = new Vertex(new Vector4(r * (float)Math.Cos(2 * Math.PI / n * (i - 1)), 0, r * (float)Math.Sin(2 * Math.PI / n * (i - 1)), 1), new Vector4(0, 1, 0, 0));
}
for (int i = 3 * n; i <= 4 * n - 1; ++i)
{
int index = i + 2;
if (index == 4 * n + 1)
{
index = 3 * n + 1;
}
allTriangles.Add(new Triangle(allVertexList[4 * n + 1], allVertexList[i + 1], allVertexList[index]));
}
for (int i = n + 1; i <= 3 * n; ++i)
{
if (i >= n + 1 && i <= 2 * n)
{
allVertexList[i] = allVertexList[i - n];
}
if (i >= 2 * n + 1 && i <= 3 * n)
{
allVertexList[i] = allVertexList[i + n];
}
}
for (int i = n; i <= 3 * n - 1; ++i)
{
if (i >= n && i <= 2 * n - 2)
{
allTriangles.Add(new Triangle(allVertexList[i + 1], allVertexList[i + 2], allVertexList[i + 1 + n]));
}
if (i == 2 * n - 1)
{
allTriangles.Add(new Triangle(allVertexList[2 * n], allVertexList[n + 1], allVertexList[3 * n]));
}
if (i >= 2 * n && i <= 3 * n - 2)
{
allTriangles.Add(new Triangle(allVertexList[i + 1], allVertexList[i + 2 - n], allVertexList[i + 2]));
}
if (i == 3 * n - 1)
{
allTriangles.Add(new Triangle(allVertexList[3 * n], allVertexList[n + 1], allVertexList[2 * n + 1]));
}
}
foreach (var triangle in allTriangles)
{
DrawTriangle(triangle);
}
}
public Triangle(Vertex _a, Vertex _b, Vertex _c)
{
a = _a;
b = _b;
c = _c;
}