/// <summary>
/// If the boxel has an opaque neighbor
/// this method will return true.
/// </summary>
/// <param name="boxel">Boxel to check</param>
/// <param name="face">Face to check</param>
/// <returns></returns>
private bool HasNeighbor(BoxelType boxel, BoxelFace face, Vector3b position)
{
int index = -1;
bool hasNeighbor = false;
Vector3 worldPosition = position.AsVector3() + Position;
switch (face)
{
case BoxelFace.BOTTOM:
index = (int)(worldPosition.X + (SIZE * ChunkManager.SIZE) * ((worldPosition.Y - 1) + (SIZE * ChunkManager.SIZE) * worldPosition.Z));
if (index >= 0 && index < ChunkManager.Instance.Boxels.Length && ChunkManager.Instance.Boxels[index] != BoxelType.NONE && worldPosition.Y != 0)
{
hasNeighbor = true;
}
break;
case BoxelFace.TOP:
index = (int)(worldPosition.X + (SIZE * ChunkManager.SIZE) * ((worldPosition.Y + 1) + (SIZE * ChunkManager.SIZE) * worldPosition.Z));
if (index >= 0 && index < ChunkManager.Instance.Boxels.Length && ChunkManager.Instance.Boxels[index] != BoxelType.NONE && worldPosition.Y != (SIZE * ChunkManager.SIZE) - 1)
{
hasNeighbor = true;
}
break;
case BoxelFace.FRONT:
index = (int)(worldPosition.X + (SIZE * ChunkManager.SIZE) * (worldPosition.Y + (SIZE * ChunkManager.SIZE) * (worldPosition.Z - 1)));
if (index >= 0 && index < ChunkManager.Instance.Boxels.Length && ChunkManager.Instance.Boxels[index] != BoxelType.NONE && worldPosition.Z != 0)
{
hasNeighbor = true;
}
break;
case BoxelFace.BACK:
index = (int)(worldPosition.X + (SIZE * ChunkManager.SIZE) * (worldPosition.Y + (SIZE * ChunkManager.SIZE) * (worldPosition.Z + 1)));
if (index >= 0 && index < ChunkManager.Instance.Boxels.Length && ChunkManager.Instance.Boxels[index] != BoxelType.NONE && worldPosition.Z != (SIZE * ChunkManager.SIZE) - 1)
{
hasNeighbor = true;
}
break;
case BoxelFace.LEFT:
index = (int)((worldPosition.X - 1) + (SIZE * ChunkManager.SIZE) * (worldPosition.Y + (SIZE * ChunkManager.SIZE) * worldPosition.Z));
if (index >= 0 && index < ChunkManager.Instance.Boxels.Length && ChunkManager.Instance.Boxels[index] != BoxelType.NONE && worldPosition.X != 0)
{
hasNeighbor = true;
}
break;
case BoxelFace.RIGHT:
index = (int)((worldPosition.X + 1) + (SIZE * ChunkManager.SIZE) * (worldPosition.Y + (SIZE * ChunkManager.SIZE) * worldPosition.Z));
if (index >= 0 && index < ChunkManager.Instance.Boxels.Length && ChunkManager.Instance.Boxels[index] != BoxelType.NONE && worldPosition.X != (SIZE * ChunkManager.SIZE) - 1)
{
hasNeighbor = true;
}
break;
}
return hasNeighbor;
}
/// <summary>
/// Creates the vertex buffer for the chunk
/// </summary>
private void BuildVertexBuffer()
{
List<int> indices = new List<int>();
List<Vector3> verts = new List<Vector3>();
List<BoxelVertex> vertices = new List<BoxelVertex>();
for (int y = 0; y < SIZE; y++)
{
for (int x = 0; x < SIZE; x++)
{
for (int z = 0; z < SIZE; z++)
{
double xWorld = (Position.X + x);
double yWorld = (Position.Y + y);
double zWorld = (Position.Z + z);
int index = (int)(xWorld + (SIZE * ChunkManager.SIZE) * (yWorld + (SIZE * ChunkManager.SIZE) * zWorld));
BoxelType boxel = ChunkManager.Instance.Boxels[index];
if (boxel != BoxelType.NONE)
{
Color color = Color.Purple;
Vector3b relativePosition = new Vector3b((byte)x, (byte)y, (byte)z);
Vector3 worldPosition = relativePosition.AsVector3() + Position;
switch (boxel)
{
case BoxelType.GRASS:
//color = new Color(102, 205, 0);
color = GameResources.Color;
color.R = (byte)(xWorld + color.R);
color.G = (byte)(yWorld + color.G);
color.B = (byte)(zWorld + color.B);
break;
case BoxelType.DIRT:
color = new Color(139, 101, 8);
color.R = (byte)((GameResources.Random.Next(40)) + color.R);
color.G = (byte)((GameResources.Random.Next(40)) + color.G);
color.B = (byte)((GameResources.Random.Next(40)) + color.B);
break;
}
// Calculate the position of the vertices on the top face.
Vector3 topLeftFront = new Vector3(-0.5f, 0.5f, -0.5f) + worldPosition;
Vector3 topLeftBack = new Vector3(-0.5f, 0.5f, 0.5f) + worldPosition;
Vector3 topRightFront = new Vector3(0.5f, 0.5f, -0.5f) + worldPosition;
Vector3 topRightBack = new Vector3(0.5f, 0.5f, 0.5f) + worldPosition;
// Calculate the position of the vertices on the bottom face.
Vector3 btmLeftFront = new Vector3(-0.5f, -0.5f, -0.5f) + worldPosition;
Vector3 btmLeftBack = new Vector3(-0.5f, -0.5f, 0.5f) + worldPosition;
Vector3 btmRightFront = new Vector3(0.5f, -0.5f, -0.5f) + worldPosition;
Vector3 btmRightBack = new Vector3(0.5f, -0.5f, 0.5f) + worldPosition;
// Calculate the position of the vertices on the top face.
Vector3b topLeftFrontb = new Vector3b(1, 2, 1) + relativePosition;
Vector3b topLeftBackb = new Vector3b(1, 2, 2) + relativePosition;
Vector3b topRightFrontb = new Vector3b(2, 2, 1) + relativePosition;
Vector3b topRightBackb = new Vector3b(2, 2, 2) + relativePosition;
// Calculate the position of the vertices on the bottom face.
Vector3b btmLeftFrontb = new Vector3b(1, 1, 1) + relativePosition;
Vector3b btmLeftBackb = new Vector3b(1, 1, 2) + relativePosition;
Vector3b btmRightFrontb = new Vector3b(2, 1, 1) + relativePosition;
Vector3b btmRightBackb = new Vector3b(2, 1, 2) + relativePosition;
Vector3b normalFront = new Vector3b(3, 3, 2);
Vector3b normalBack = new Vector3b(3, 3, 4);
Vector3b normalTop = new Vector3b(3, 4, 3);
Vector3b normalBottom = new Vector3b(3, 2, 3);
Vector3b normalLeft = new Vector3b(2, 3, 3);
Vector3b normalRight = new Vector3b(4, 3, 3);
if (!HasNeighbor(boxel, BoxelFace.FRONT, relativePosition))
{
// Add the vertices for the FRONT face.
vertices.Add(new BoxelVertex(topLeftFrontb, color, normalFront));
vertices.Add(new BoxelVertex(btmLeftFrontb, color, normalFront));
vertices.Add(new BoxelVertex(topRightFrontb, color, normalFront));
vertices.Add(new BoxelVertex(btmLeftFrontb, color, normalFront));
vertices.Add(new BoxelVertex(btmRightFrontb, color, normalFront));
vertices.Add(new BoxelVertex(topRightFrontb, color, normalFront));
int offset = verts.Count;
verts.Add(topLeftFront); // 0
verts.Add(btmLeftFront); // 1
verts.Add(topRightFront); // 2
verts.Add(btmRightFront); // 3
indices.Add(0 + offset);
indices.Add(1 + offset);
indices.Add(2 + offset);
indices.Add(3 + offset);
indices.Add(2 + offset);
indices.Add(1 + offset);
}
if (!HasNeighbor(boxel, BoxelFace.BACK, relativePosition))
{
// Add the verts for the BACK face.
vertices.Add(new BoxelVertex(topLeftBackb, color, normalBack));
vertices.Add(new BoxelVertex(topRightBackb, color, normalBack));
vertices.Add(new BoxelVertex(btmLeftBackb, color, normalBack));
vertices.Add(new BoxelVertex(btmLeftBackb, color, normalBack));
vertices.Add(new BoxelVertex(topRightBackb, color, normalBack));
vertices.Add(new BoxelVertex(btmRightBackb, color, normalBack));
int offset = verts.Count;
verts.Add(topLeftBack); // 0
verts.Add(topRightBack); // 1
verts.Add(btmLeftBack); // 2
verts.Add(btmRightBack); // 3
indices.Add(0 + offset);
indices.Add(1 + offset);
indices.Add(2 + offset);
indices.Add(3 + offset);
indices.Add(2 + offset);
indices.Add(1 + offset);
}
if (!HasNeighbor(boxel, BoxelFace.TOP, relativePosition))
{
// Add the verts for the TOP face.
vertices.Add(new BoxelVertex(topLeftFrontb, color, normalTop));
vertices.Add(new BoxelVertex(topRightBackb, color, normalTop));
vertices.Add(new BoxelVertex(topLeftBackb, color, normalTop));
vertices.Add(new BoxelVertex(topLeftFrontb, color, normalTop));
vertices.Add(new BoxelVertex(topRightFrontb, color, normalTop));
vertices.Add(new BoxelVertex(topRightBackb, color, normalTop));
int offset = verts.Count;
verts.Add(topLeftFront); // 0
verts.Add(topRightBack); // 1
verts.Add(topLeftBack); // 2
verts.Add(topRightFront); // 3
indices.Add(0 + offset);
indices.Add(1 + offset);
indices.Add(2 + offset);
indices.Add(3 + offset);
indices.Add(1 + offset);
indices.Add(0 + offset);
}
if (!HasNeighbor(boxel, BoxelFace.BOTTOM, relativePosition))
{
// Add the verts for the BOTTOM face.
vertices.Add(new BoxelVertex(btmLeftFrontb, color, normalBottom));
vertices.Add(new BoxelVertex(btmLeftBackb, color, normalBottom));
vertices.Add(new BoxelVertex(btmRightBackb, color, normalBottom));
vertices.Add(new BoxelVertex(btmLeftFrontb, color, normalBottom));
vertices.Add(new BoxelVertex(btmRightBackb, color, normalBottom));
vertices.Add(new BoxelVertex(btmRightFrontb, color, normalBottom));
int offset = verts.Count;
verts.Add(btmLeftFront); // 0
verts.Add(btmLeftBack); // 1
verts.Add(btmRightBack); // 2
verts.Add(btmRightFront); // 3
indices.Add(0 + offset);
indices.Add(1 + offset);
indices.Add(2 + offset);
indices.Add(3 + offset);
indices.Add(0 + offset);
indices.Add(2 + offset);
}
if (!HasNeighbor(boxel, BoxelFace.LEFT, relativePosition))
{
// Add the verts for the LEFT face.
vertices.Add(new BoxelVertex(topLeftFrontb, color, normalLeft));
vertices.Add(new BoxelVertex(btmLeftBackb, color, normalLeft));
vertices.Add(new BoxelVertex(btmLeftFrontb, color, normalLeft));
vertices.Add(new BoxelVertex(topLeftBackb, color, normalLeft));
vertices.Add(new BoxelVertex(btmLeftBackb, color, normalLeft));
vertices.Add(new BoxelVertex(topLeftFrontb, color, normalLeft));
int offset = verts.Count;
verts.Add(topLeftFront); // 0
verts.Add(btmLeftBack); // 1
verts.Add(btmLeftFront); // 2
verts.Add(topLeftBack); // 3
indices.Add(0 + offset);
indices.Add(1 + offset);
indices.Add(2 + offset);
indices.Add(3 + offset);
indices.Add(1 + offset);
indices.Add(0 + offset);
}
if (!HasNeighbor(boxel, BoxelFace.RIGHT, relativePosition))
{
// Add the verts for the RIGHT face.
vertices.Add(new BoxelVertex(topRightFrontb, color, normalRight));
vertices.Add(new BoxelVertex(btmRightFrontb, color, normalRight));
vertices.Add(new BoxelVertex(btmRightBackb, color, normalRight));
vertices.Add(new BoxelVertex(topRightBackb, color, normalRight));
vertices.Add(new BoxelVertex(topRightFrontb, color, normalRight));
vertices.Add(new BoxelVertex(btmRightBackb, color, normalRight));
int offset = verts.Count;
verts.Add(topRightFront); // 0
verts.Add(btmRightFront); // 1
verts.Add(btmRightBack); // 2
verts.Add(topRightBack); // 3
indices.Add(0 + offset);
indices.Add(1 + offset);
indices.Add(2 + offset);
indices.Add(3 + offset);
indices.Add(0 + offset);
indices.Add(1 + offset);
}
}
}
}
}
if (vertices.Count > 0)
{
_vertexBuffer = new VertexBuffer(GameResources.GraphicsDevice, BoxelVertex.VertexDeclaration, vertices.Count, BufferUsage.None);
_vertexBuffer.SetData(vertices.ToArray());
_collisionMesh = new StaticMesh(verts.ToArray(), indices.ToArray());
ChunkManager.Instance.FaceCount += indices.Count / 3;
PhysicsManager.Instance.Space.Add(_collisionMesh);
}
}