For our student project I've been tinkering with an OBJ-loader in order to import models into our application. It loads without issues, and drawing it kind of works without index (the model is obviously not represented correctly because I'm not using an index buffer) However, drawing with DeviceContext->DrawIndexed shows nothing on screen.

Without indexed drawing

With indexed drawing

Buffer creation method:

void ObjectLoader::CreateBuffers()
    //Index buffer
    D3D11_BUFFER_DESC iBufferDesc;
    memset(&iBufferDesc, 0, sizeof(iBufferDesc));
    iBufferDesc.BindFlags = D3D11_BIND_INDEX_BUFFER;
    iBufferDesc.Usage = D3D11_USAGE_DEFAULT;
    iBufferDesc.ByteWidth = sizeof(DWORD);

    D3D11_SUBRESOURCE_DATA indexData;
    indexData.pSysMem = &ind;
    pDevice->CreateBuffer(&iBufferDesc, &indexData, &pIndexBuffer);

    //Vertex buffer
    D3D11_BUFFER_DESC bufferDesc;
    memset(&bufferDesc, 0, sizeof(bufferDesc));
    bufferDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
    bufferDesc.Usage = D3D11_USAGE_DEFAULT;
    bufferDesc.ByteWidth = sizeof(TriangleVertex) * this->NumberOfVerts();

    data.pSysMem = tva;
    pDevice->CreateBuffer(&bufferDesc, &data, &pVertexBuffer);

Draw method:

void ObjectLoader::Draw()
    if (pDevice == nullptr)

    UINT32 vertexSize = sizeof(float) * 5;
    UINT32 offset = 0;

    pDeviceContext->IASetVertexBuffers(0, 1, &pVertexBuffer, &vertexSize, &offset);
    pDeviceContext->IASetIndexBuffer(this->pIndexBuffer, DXGI_FORMAT_R32_UINT, 0);

    pDeviceContext->DrawIndexed(vIndex.size(),0 , 0);

    //pDeviceContext->Draw(this->NumberOfVerts(), 0);


Index data is initially stored in an unsigned integer array before being passed to D3DD11_SUBRESOURCE_DATA

//index array
UINT* ind;

What the hell am I missing? I've looked at several books on indexed drawing and it seems pretty straight-forward. At first I thought the winding order was reversed but I checked this by simply reversing the index array; same result.

If you need more code let me know, but I feel this should suffice.

Thanks in advance!


1 Answer 1

iBufferDesc.ByteWidth = sizeof(DWORD);

This is only storing a single index.

  • \$\begingroup\$ Yep, shouldve double-checked that stuff.. Thank you! \$\endgroup\$ Feb 17, 2017 at 5:48

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