DirectX 11 Grid沒有正確繪製

Question

我是新的DirectX編程... 我寫了一個代碼繪製網格（遵循Frank D. Luna）。代碼幾乎正確地工作 - 網格被繪製，但不是所有的頂點。這裏是網格的圖像：

我正在繪製一個4x4網格。 正如圖所示，最底層的頂點不繪製，並且在每行一個額外的三角形被繪製，從第一款四拉伸去年四每一行

守則：

void Model::CreateGrid(const Vector3& centerPos,float width,float depth,int verticesX,int verticesZ 
{ 
    assert(verticesX > 1 || verticesZ >1); 
    gridVertexCount = verticesX*verticesZ; 
    gridIndexCount = (verticesX - 1)*(verticesZ - 1)*6; 
    v.resize(gridVertexCount); 
    vIndex.resize(gridIndexCount); 
    float dx = width/(verticesX - 1); 
    float dz = depth/(verticesZ - 1); 
    float halfWidth = width/2.0f; 
    float halfDepth = depth/2.0f; 
    //Compute The Grid Vertex 
    for (size_t rows = 0; rows < verticesZ; rows++) 
    { 
     float z = halfDepth - rows*dz; 
     for (size_t col = 0; col < verticesX; col++) 
     { 
      float x = -halfWidth + col*dx; 
      v[col + rows*verticesX].pos = XMFLOAT3(x+centerPos.x, 0.0f, z + centerPos.z); 
      v[col + rows*verticesX].color = Colors::White; 
     } 
    } 

    //Compute the Grid Indices 
    UINT k = 0; 
    for (size_t row = 0; row < verticesZ - 1; row++) 
    { 
     for (size_t col = 0; col < verticesX - 1; col++) 
     { 
      //Index of One Quad 
      vIndex[k] = row*verticesX + col; 
      vIndex[k + 1] = row*verticesX+col+1; 
      vIndex[k + 2] = (row + 1)*verticesX + col; 
      vIndex[k + 3] = (row + 1)*verticesX + col; 
      vIndex[k + 4] = row*verticesX + col + 1; 
      vIndex[k + 5] = (row + 1)*verticesX + (col+1); 
      //Move to Next Quad 
      k +=6; 
     } 
    } 
    gridVertexSize = v.size(); 
    gridIndexSize = vIndex.size(); 
    //Add Vertex Data to Global Mesh Data 
    globalMesh.VertexData.insert(globalMesh.VertexData.end(), v.begin(),v.end()); 
    v.clear(); 
    //Add Index Data to Global Mesh Data 
    globalMesh.IndexData.insert(globalMesh.IndexData.end(), vIndex.begin(), vIndex.end()); 
    vIndex.clear(); 
    this->BuildGeometryBuffers(); 
    this->BuildFX(); 
    this->BuildVertexLayout(nullptr); 
} 

//Then I Set the Buffers 
void Model::BuildGeometryBuffers() 

{  

    //Set Vertex Buffer Description 
    D3D11_BUFFER_DESC vbd; 
    vbd.Usage = D3D11_USAGE_IMMUTABLE; 
    vbd.ByteWidth = (UINT)sizeof(Vertex)*globalMesh.VertexData.size();  
    vbd.BindFlags = D3D11_BIND_VERTEX_BUFFER; 
    vbd.CPUAccessFlags = 0; 
    vbd.MiscFlags = 0; 
    vbd.StructureByteStride = 0; 
    D3D11_SUBRESOURCE_DATA vintData; 
    vintData.pSysMem = &globalMesh.VertexData[0]; 
    device->CreateBuffer(&vbd, &vintData, &m_vB); 

    //Set Index Buffer Description 
    D3D11_BUFFER_DESC ibd; 

    ibd.Usage = D3D11_USAGE_IMMUTABLE; 
    ibd.ByteWidth = (UINT)sizeof(UINT)*globalMesh.IndexData.size();   
    ibd.BindFlags = D3D11_BIND_INDEX_BUFFER; 
    ibd.CPUAccessFlags = 0; 
    ibd.MiscFlags = 0; 
    ibd.StructureByteStride = 0; 
    D3D11_SUBRESOURCE_DATA iinitData; 
    iinitData.pSysMem = &globalMesh.IndexData[0]; 
    device->CreateBuffer(&ibd, &iinitData, &m_iB); 
} 

什麼我的代碼有問題嗎？

Answer 1

解決它： 改變了這個：

 vIndex[k] = row*verticesX + col; 
     vIndex[k + 1] = row*verticesX+col+1; 
     vIndex[k + 2] = (row + 1)*verticesX + col; 
     vIndex[k + 3] = (row + 1)*verticesX + col; 
     vIndex[k + 4] = row*verticesX + col + 1; 
     vIndex[k + 5] = (row + 1)*verticesX + (col+1); 

要：

  vIndex[k] = row*verticesX + col; 
      vIndex[k + 1] = row*verticesX+col+1; 
      vIndex[k + 2] = (row + 1)*verticesX + col; 
      vIndex[k + 3] = row*verticesX + col + 1; 
      vIndex[k + 4] = (row + 1)*verticesX + (col + 1); 
      vIndex[k + 5] = (row + 1)*verticesX + col;