Triangle Grid Not Rendering correctly [DirectX 11] - c++

Question

I'm trying to make a grid of triangles for a terrain generation project in DirectX 11, but when it gets drawn to the screen it draws in all three axis, instead of just the x and z.
I do get the correct amount of vertices and indices, but in the vector of indices it has a size of 972, the first 486 of them are set to 0 instead of the actual values.
I was wondering if I could get some clarification on whether I was setting the vertex/index buffers correctly.
Below is an example for a 10 by 10 grid.
GenerateTerrain method
void Application::GenerateTerrain(int vertRows, int vertCols)
{
HRESULT hr;
// ------------------------------------- Create Vertex Buffer --------------------------------------
totalCellRows = vertRows - 1;
totalCellCols = vertCols - 1;
// Width and Total Width
float dx = 1.0f;
float totalWidth = totalCellCols * dx;
// Depth and Total Depth
float dz = 1.0f;
float totalDepth = totalCellRows * dz;
// X and Z Offsets
float xOffset = -totalWidth * 0.5f;
float zOffset = totalDepth * 0.5f;
totalVertices = vertRows * vertCols;
totalTriangles = (totalCellRows * totalCellCols) * 2;
totalIndices = totalTriangles * 3;
terrainVertices = new SimpleVertex[totalVertices];
// Array Version
int k = 0;
for (int i = 0; i < vertRows; i++)
{
for (int j = 0; j < vertCols; j++)
{
SimpleVertex newVertex;
terrainVertices[k].PosL = XMFLOAT3(j * dx + xOffset, 0.0f, -(i * dz) + zOffset);
terrainVertices[k].NormL = XMFLOAT3(0.0f, 1.0f, 0.0f);
terrainVertices[k].Tex = XMFLOAT2(0.0f, 0.0f);
k++;
}
}
D3D11_BUFFER_DESC bd;
ZeroMemory(&bd, sizeof(bd));
bd.Usage = D3D11_USAGE_DEFAULT;
bd.ByteWidth = sizeof(SimpleVertex) * totalVertices;
bd.BindFlags = D3D11_BIND_VERTEX_BUFFER;
bd.CPUAccessFlags = 0;
D3D11_SUBRESOURCE_DATA InitData;
ZeroMemory(&InitData, sizeof(InitData));
InitData.pSysMem = &terrainVertices;
hr = _pd3dDevice->CreateBuffer(&bd, &InitData, &_pGridVertexBuffer);
// ------------------------------------- Create Index Buffer --------------------------------------
// Vector Version
indices.resize(totalIndices);
for (WORD i = 0; i < (WORD)vertRows - 1; i++)
{
for (WORD j = 0; j < (WORD)vertCols - 1; j++)
{
indices.push_back(i * vertCols + j);
indices.push_back(i * vertCols + (j + 1));
indices.push_back((i + 1) * vertCols + j);
indices.push_back((i + 1) * vertCols + j);
indices.push_back((i * vertCols + (j + 1)));
indices.push_back((i + 1) * vertCols + (j + 1));
}
}
ZeroMemory(&bd, sizeof(bd));
bd.Usage = D3D11_USAGE_DEFAULT;
bd.ByteWidth = sizeof(WORD) * totalIndices;
bd.BindFlags = D3D11_BIND_INDEX_BUFFER;
bd.CPUAccessFlags = 0;
ZeroMemory(&InitData, sizeof(InitData));
InitData.pSysMem = &indices;
hr = _pd3dDevice->CreateBuffer(&bd, &InitData, &_pGridIndexBuffer);
}

Answer 1

indices.resize(totalIndices); <----- !!!!!!ERROR!!!! u mean reserve
for (WORD i = 0; i < (WORD)vertRows - 1; i++)
{
for (WORD j = 0; j < (WORD)vertCols - 1; j++)
{
indices.push_back(i * vertCols + j);
indices.push_back(i * vertCols + (j + 1));
indices.push_back((i + 1) * vertCols + j);
indices.push_back((i + 1) * vertCols + j);
indices.push_back((i * vertCols + (j + 1)));
indices.push_back((i + 1) * vertCols + (j + 1));
}
}
You write resize, so the vector is resized, and then you add more indices with pushback. I think you want to reserve memory "reserve" and add them with pushback.
Also i would recommend to use a pointer to the first value, instead of a pointer to the vector
you:
InitData.pSysMem = &indices;
better:
InitData.pSysMem = &indices[0];
Buffer initialization seems to be ok.
Good luck