public VertexModelMesh Clone()
{
VertexModelMesh vertexModelMeshCopy = new VertexModelMesh();
VertexPositionColorTexture[] verticesClone = new VertexPositionColorTexture[mVertexDataArray.Length];
short[] vertexIndiceClone = new short[mIndexDataArray.Length];
for (int i = 0; i < verticesClone.Length; i++)
{
verticesClone[i] = new VertexPositionColorTexture(mVertexDataArray[i].Position, mVertexDataArray[i].Color, mVertexDataArray[i].TextureCoordinate);
}
for (int i = 0; i < vertexIndiceClone.Length; i++)
{
vertexIndiceClone[i] = mIndexDataArray[i];
}
vertexModelMeshCopy.SetVertices(verticesClone);
vertexModelMeshCopy.SetVertexIndice(vertexIndiceClone);
return(vertexModelMeshCopy);
}
/// <summary>
/// Constructs a new sphere primitive,
/// with the specified size and tessellation level.
/// </summary>
public SpherePrimitive(VertexModelMesh vertexModelMesh,
float diameter, int tessellation, Color color)
{
mVertexModelMesh = vertexModelMesh;
mColor = color;
if (tessellation < 3)
{
throw new ArgumentOutOfRangeException("tessellation");
}
int verticalSegments = tessellation;
int horizontalSegments = tessellation * 2;
float radius = diameter / 2;
// Start with a single vertex at the bottom of the sphere.
mVertexModelMesh.AddVertex(Vector3.Down * radius, mColor, new Vector2());
// Create rings of vertices at progressively higher latitudes.
for (int i = 0; i < verticalSegments - 1; i++)
{
float latitude = ((i + 1) * MathHelper.Pi /
verticalSegments) - MathHelper.PiOver2;
float dy = (float)Math.Sin(latitude);
float dxz = (float)Math.Cos(latitude);
// Create a single ring of vertices at this latitude.
for (int j = 0; j < horizontalSegments; j++)
{
float longitude = j * MathHelper.TwoPi / horizontalSegments;
float dx = (float)Math.Cos(longitude) * dxz;
float dz = (float)Math.Sin(longitude) * dxz;
Vector3 normal = new Vector3(dx, dy, dz);
mVertexModelMesh.AddVertex(normal * radius, mColor, new Vector2());
}
}
// Finish with a single vertex at the top of the sphere.
mVertexModelMesh.AddVertex(Vector3.Up * radius, mColor, new Vector2());
// Create a fan connecting the bottom vertex to the bottom latitude ring.
for (int i = 0; i < horizontalSegments; i++)
{
mVertexModelMesh.AddIndexData((short)0);
mVertexModelMesh.AddIndexData((short)(1 + (i + 1) % horizontalSegments));
mVertexModelMesh.AddIndexData((short)(1 + i));
}
// Fill the sphere body with triangles joining each pair of latitude rings.
for (int i = 0; i < verticalSegments - 2; i++)
{
for (int j = 0; j < horizontalSegments; j++)
{
int nextI = i + 1;
int nextJ = (j + 1) % horizontalSegments;
mVertexModelMesh.AddIndexData((short)(1 + i * horizontalSegments + j));
mVertexModelMesh.AddIndexData((short)(1 + i * horizontalSegments + nextJ));
mVertexModelMesh.AddIndexData((short)(1 + nextI * horizontalSegments + j));
mVertexModelMesh.AddIndexData((short)(1 + i * horizontalSegments + nextJ));
mVertexModelMesh.AddIndexData((short)(1 + nextI * horizontalSegments + nextJ));
mVertexModelMesh.AddIndexData((short)(1 + nextI * horizontalSegments + j));
}
}
int currentVertex = mVertexModelMesh.GetVertexVectors().Length;
// Create a fan connecting the top vertex to the top latitude ring.
for (int i = 0; i < horizontalSegments; i++)
{
mVertexModelMesh.AddIndexData((short)(currentVertex - 1));
mVertexModelMesh.AddIndexData((short)(currentVertex - 2 - (i + 1) % horizontalSegments));
mVertexModelMesh.AddIndexData((short)(currentVertex - 2 - i));
}
}
public void AddMesh(VertexModelMesh vertexModelMesh)
{
mVertexModelMeshes.Add(vertexModelMesh);
}