public static Sphere CreateNormalTextured(GraphicsDevice device, int slices, int stacks)
{
var vpnt = new VertexPositionNormalTexture[(slices + 1) * (stacks + 1)];
float phi, theta;
float dphi = MathHelper.Pi / stacks;
float dtheta = MathHelper.TwoPi / slices;
float x, y, z, sc;
int index = 0;
for (int stack = 0; stack <= stacks; stack++)
{
phi = MathHelper.PiOver2 - stack * dphi;
y = (float)Math.Sin(phi);
sc = -(float)Math.Cos(phi);
for (int slice = 0; slice <= slices; slice++)
{
theta = slice * dtheta;
x = sc * (float)Math.Sin(theta);
z = sc * (float)Math.Cos(theta);
vpnt[index++] = new VertexPositionNormalTexture(new Vector3(x, y, z), new Vector3(x, y, z),
new Vector2((float)slice / (float)slices, (float)stack / (float)stacks));
}
}
var indices = new ushort[slices * stacks * 6];
index = 0;
int k = slices + 1;
for (int stack = 0; stack < stacks; stack++)
{
for (int slice = 0; slice < slices; slice++)
{
indices[index++] = (ushort)((stack + 0) * k + slice);
indices[index++] = (ushort)((stack + 1) * k + slice);
indices[index++] = (ushort)((stack + 0) * k + slice + 1);
indices[index++] = (ushort)((stack + 0) * k + slice + 1);
indices[index++] = (ushort)((stack + 1) * k + slice);
indices[index++] = (ushort)((stack + 1) * k + slice + 1);
}
}
var ret = new Sphere();
ret.vertexBuffer = new VertexBuffer(device, VertexPositionNormalTexture.VertexDeclaration, vpnt.Length, BufferUsage.WriteOnly);
ret.vertexBuffer.SetData(vpnt);
ret.indexBuffer = new IndexBuffer(device, IndexElementSize.SixteenBits, indices.Length, BufferUsage.WriteOnly);
ret.indexBuffer.SetData(indices);
ret.effect = new BasicEffect(device);
ret.effect.TextureEnabled = true;
return ret;
}
public Sky(GraphicsDevice device, Texture2D tex)
{
model = Sphere.CreateNormalTextured(device, 20, 20);
model.effect.Texture = tex;
}