好吧，我决定最终为我的 Minecraft 引擎添加索引支持，但问题是，一旦我添加了它们，什么都没有出现……我知道这不是很具描述性，但有人可以查看我的代码，看看我是否在做出了点问题；）谢谢。
public void BuildVertexBuffers()
{
// TODO: Implyment index
SolidVertices = new List<VertexPositionTexture>();
IndexList = new List<short>();
short i = 0;
for (short x = 0; x < Variables.REGION_SIZE_X; x++)
{
for (short y = 0; y < Variables.REGION_SIZE_Y; y++)
{
for (short z = 0; z < Variables.REGION_SIZE_Z; z++)
{
int X = (int)(Index.X * Variables.REGION_SIZE_X + x);
int Y = (int)(Index.Y * Variables.REGION_SIZE_Y + y);
int Z = (int)(Index.Z * Variables.REGION_SIZE_Z + z);
bool above = world.Exists(X, Y + 1, Z);
bool below = world.Exists(X, Y - 1, Z);
bool left = world.Exists(X - 1, Y, Z);
bool right = world.Exists(X + 1, Y, Z);
bool front = world.Exists(X, Y, Z + 1);
bool back = world.Exists(X, Y, Z - 1);
bool notVisible = above && below && left && right && front && back;
if (notVisible)
continue;
if (world.GetBlock(X, Y, Z).BlockType == BlockType.none)
continue;
i++;
if (!back)
BuildIndexBuffer(world.GetBlock(X, Y, Z), new Vector3(X, Y, Z), BlockFaceDirection.ZDecreasing);
if (!front)
BuildIndexBuffer(world.GetBlock(X, Y, Z), new Vector3(X, Y, Z), BlockFaceDirection.ZIncreasing);
if (!above)
BuildIndexBuffer(world.GetBlock(X, Y, Z), new Vector3(X, Y, Z), BlockFaceDirection.YIncreasing);
if (!below)
BuildIndexBuffer(world.GetBlock(X, Y, Z), new Vector3(X, Y, Z), BlockFaceDirection.YDecreasing);
if (!right)
BuildIndexBuffer(world.GetBlock(X, Y, Z), new Vector3(X, Y, Z), BlockFaceDirection.XIncreasing);
if (!left)
BuildIndexBuffer(world.GetBlock(X, Y, Z), new Vector3(X, Y, Z), BlockFaceDirection.XDecreasing);
}
}
}
CopyToBuffers();
Dirty = false;
}
public void BuildIndexBuffer(Block block, Vector3 pos, BlockFaceDirection blockFaceDirection)
{
Vector3 topLeftFront = new Vector3(0f, 1f, 0f) + pos;
Vector3 bottomLeftFront = new Vector3(0f, 0f, 0f) + pos;
Vector3 topRightFront = new Vector3(1f, 1f, 0f) + pos;
Vector3 bottomRightFront = new Vector3(1f, 0f, 0f) + pos;
Vector3 topLeftBack = new Vector3(0f, 1f, -1f) + pos;
Vector3 topRightBack = new Vector3(1f, 1f, -1f) + pos;
Vector3 bottomLeftBack = new Vector3(0f, 0f, -1f) + pos;
Vector3 bottomRightBack = new Vector3(1f, 0f, -1f) + pos;
int row = (int)block.BlockType / Variables.TILE_ALAIS.NumberOfColumns;
int column = (int)block.BlockType - row * Variables.TILE_ALAIS.NumberOfColumns;
float unit = 1.0f / (float)Variables.TILE_ALAIS.NumberOfColumns;
float x = column * unit;
float y = row * unit;
Vector2 topLeft = new Vector2(x, y);
Vector2 topRight = new Vector2(x + unit, y);
Vector2 bottomLeft = new Vector2(x, y + unit);
Vector2 bottomRight = new Vector2(x + unit, y + unit);
switch (blockFaceDirection)
{
case BlockFaceDirection.ZIncreasing:
SolidVertices.Add(new VertexPositionTexture(bottomLeftFront, bottomLeft));
SolidVertices.Add(new VertexPositionTexture(bottomRightFront, bottomRight));
SolidVertices.Add(new VertexPositionTexture(topLeftFront, topLeft));
SolidVertices.Add(new VertexPositionTexture(topRightFront, topRight));
AddIndices(0, 2, 3, 3, 1, 0);
break;
case BlockFaceDirection.ZDecreasing:
SolidVertices.Add(new VertexPositionTexture(bottomRightBack, bottomLeft));
SolidVertices.Add(new VertexPositionTexture(bottomLeftBack, bottomRight));
SolidVertices.Add(new VertexPositionTexture(topRightBack, topLeft));
SolidVertices.Add(new VertexPositionTexture(topLeftBack, topRight));
AddIndices(0, 2, 3, 3, 1, 0);
break;
case BlockFaceDirection.YIncreasing:
SolidVertices.Add(new VertexPositionTexture(topLeftFront, bottomLeft));
SolidVertices.Add(new VertexPositionTexture(topRightFront, bottomRight));
SolidVertices.Add(new VertexPositionTexture(topLeftBack, topLeft));
SolidVertices.Add(new VertexPositionTexture(topRightBack, topRight));
AddIndices(0, 2, 3, 3, 1, 0);
break;
case BlockFaceDirection.YDecreasing:
SolidVertices.Add(new VertexPositionTexture(bottomLeftBack, bottomLeft));
SolidVertices.Add(new VertexPositionTexture(bottomRightBack, bottomRight));
SolidVertices.Add(new VertexPositionTexture(bottomLeftFront, topLeft));
SolidVertices.Add(new VertexPositionTexture(bottomRightFront, topRight));
AddIndices(0, 2, 3, 3, 1, 0);
break;
case BlockFaceDirection.XIncreasing:
SolidVertices.Add(new VertexPositionTexture(bottomRightFront, bottomLeft));
SolidVertices.Add(new VertexPositionTexture(bottomRightBack, bottomRight));
SolidVertices.Add(new VertexPositionTexture(topRightFront, topLeft));
SolidVertices.Add(new VertexPositionTexture(topRightBack, topRight));
AddIndices(0, 2, 3, 3, 1, 0);
break;
case BlockFaceDirection.XDecreasing:
SolidVertices.Add(new VertexPositionTexture(bottomLeftBack, bottomLeft));
SolidVertices.Add(new VertexPositionTexture(bottomLeftFront, bottomRight));
SolidVertices.Add(new VertexPositionTexture(topLeftBack, topLeft));
SolidVertices.Add(new VertexPositionTexture(topLeftFront, topRight));
AddIndices(0, 2, 3, 3, 1, 0);
break;
}
}
public void AddIndices(short i0, short i1, short i2, short i3, short i4, short i5)
{
IndexList.Add((short)(i0 + VertexCount));
IndexList.Add((short)(i1 + VertexCount));
IndexList.Add((short)(i2 + VertexCount));
IndexList.Add((short)(i3 + VertexCount));
IndexList.Add((short)(i4 + VertexCount));
IndexList.Add((short)(i5 + VertexCount));
VertexCount += 4;
}
private void CopyToBuffers()
{
SolidVertexBuffer = new VertexBuffer(Variables.GRAPHICS_DEVICE, VertexPositionTexture.VertexDeclaration, SolidVertices.Count, BufferUsage.WriteOnly);
SolidVertexBuffer.SetData(SolidVertices.ToArray());
SolidIndices = new IndexBuffer(Variables.GRAPHICS_DEVICE, typeof(int), IndexList.Count, BufferUsage.WriteOnly);
SolidIndices.SetData(IndexList.ToArray());
}
当我只使用一个普通的顶点缓冲区时，它工作得很好，这里是它的代码：
public void BuildFaceVertices(Block block, Vector3 pos, BlockFaceDirection blockFaceDirection)
{
Vector3 topLeftFront = new Vector3(0f, 1f, 0f) + pos;
Vector3 bottomLeftFront = new Vector3(0f, 0f, 0f) + pos;
Vector3 topRightFront = new Vector3(1f, 1f, 0f) + pos;
Vector3 bottomRightFront = new Vector3(1f, 0f, 0f) + pos;
Vector3 topLeftBack = new Vector3(0f, 1f, -1f) + pos;
Vector3 topRightBack = new Vector3(1f, 1f, -1f) + pos;
Vector3 bottomLeftBack = new Vector3(0f, 0f, -1f) + pos;
Vector3 bottomRightBack = new Vector3(1f, 0f, -1f) + pos;
int row = (int)block.BlockType / Variables.TILE_ALAIS.NumberOfColumns;
int column = (int)block.BlockType - row * Variables.TILE_ALAIS.NumberOfColumns;
float unit = 1.0f / (float)Variables.TILE_ALAIS.NumberOfColumns;
float x = column * unit;
float y = row * unit;
Vector2 topLeft = new Vector2(x, y);
Vector2 topRight = new Vector2(x + unit, y);
Vector2 bottomLeft = new Vector2(x, y + unit);
Vector2 bottomRight = new Vector2(x + unit, y + unit);
switch (blockFaceDirection)
{
case BlockFaceDirection.ZIncreasing:
SolidVertices.Add(new VertexPositionTexture(topRightFront, topRight));
SolidVertices.Add(new VertexPositionTexture(bottomRightFront, bottomRight));
SolidVertices.Add(new VertexPositionTexture(bottomLeftFront, bottomLeft));
SolidVertices.Add(new VertexPositionTexture(topRightFront, topRight));
SolidVertices.Add(new VertexPositionTexture(bottomLeftFront, bottomLeft));
SolidVertices.Add(new VertexPositionTexture(topLeftFront, topLeft));
break;
case BlockFaceDirection.ZDecreasing:
// Clockwise
SolidVertices.Add(new VertexPositionTexture(bottomRightBack, bottomLeft));
SolidVertices.Add(new VertexPositionTexture(topRightBack, topLeft));
SolidVertices.Add(new VertexPositionTexture(topLeftBack, topRight));
SolidVertices.Add(new VertexPositionTexture(bottomLeftBack, bottomRight));
SolidVertices.Add(new VertexPositionTexture(bottomRightBack, bottomLeft));
SolidVertices.Add(new VertexPositionTexture(topLeftBack, topRight));
break;
case BlockFaceDirection.YIncreasing:
SolidVertices.Add(new VertexPositionTexture(topRightBack, topRight));
SolidVertices.Add(new VertexPositionTexture(topRightFront, bottomRight));
SolidVertices.Add(new VertexPositionTexture(topLeftFront, bottomLeft));
SolidVertices.Add(new VertexPositionTexture(topRightBack, topRight));
SolidVertices.Add(new VertexPositionTexture(topLeftFront, bottomLeft));
SolidVertices.Add(new VertexPositionTexture(topLeftBack, topLeft));
break;
case BlockFaceDirection.YDecreasing:
SolidVertices.Add(new VertexPositionTexture(bottomLeftFront, topLeft));
SolidVertices.Add(new VertexPositionTexture(bottomRightFront, topRight));
SolidVertices.Add(new VertexPositionTexture(bottomLeftBack, bottomLeft));
SolidVertices.Add(new VertexPositionTexture(bottomRightFront, topRight));
SolidVertices.Add(new VertexPositionTexture(bottomRightBack, bottomRight));
SolidVertices.Add(new VertexPositionTexture(bottomLeftBack, bottomLeft));
break;
case BlockFaceDirection.XIncreasing:
SolidVertices.Add(new VertexPositionTexture(topRightBack, topRight));
SolidVertices.Add(new VertexPositionTexture(bottomRightFront, bottomLeft));
SolidVertices.Add(new VertexPositionTexture(topRightFront, topLeft));
SolidVertices.Add(new VertexPositionTexture(topRightBack, topRight));
SolidVertices.Add(new VertexPositionTexture(bottomRightBack, bottomRight));
SolidVertices.Add(new VertexPositionTexture(bottomRightFront, bottomLeft));
break;
case BlockFaceDirection.XDecreasing:
SolidVertices.Add(new VertexPositionTexture(topLeftBack, topLeft));
SolidVertices.Add(new VertexPositionTexture(topLeftFront, topRight));
SolidVertices.Add(new VertexPositionTexture(bottomLeftFront, bottomRight));
SolidVertices.Add(new VertexPositionTexture(topLeftBack, topLeft));
SolidVertices.Add(new VertexPositionTexture(bottomLeftFront, bottomRight));
SolidVertices.Add(new VertexPositionTexture(bottomLeftBack, bottomLeft));
break;
}
}
有任何想法吗？
谢谢，问候， Darestium