DirectX 9 not rendering after adding transforms

Question

so far I got a cube rendered without any transforms (thus it was rendered in an orthographic perspective), and I am working on the previous code to get it into a perspective view, with all the matrices involved. I changed the Flexible Vertex Format so as not to have RHW (thus only having XYZ coordinates and color, tried ARGB and XRGB but I don't think it matters), and I added a function that sets all the matrices.

Debugging
showed that matrices are being created correctly, functions return correctly (as far as I could see), no crashes (DirectX will never complain if something goes wrong, it just doesn't render) and in general, step-by-step debugging shows no paranormal activity.

Existing project (which I modify and eventually prevent from working):
As I advance I also write tutorials of sorts so I can go back and see what I did last time to get it to work, and this time I've kept versions so you can get the code here along with the VS2010 solution, all the DirectX work is done in 3Dheader.h and D3DLoader.h

Changes:
- the custom vertex format FVF_CUSTOMVERTEX has been changed so as not to include RHW, as I understand it has to be removed so as to be computed through the transformations - In Render() I add a call to the function setMatrices() which does all the matrix and transform work, and is as follows:

void setMatrices()
{
    //--------------transformation code----------------//
    D3DXMATRIX objectM, translationM, rotationM, projectionM, lookAtM, finalM;

HRESULT hr;

D3DXMatrixIdentity(&objectM);
D3DXMatrixRotationY(&rotationM, D3DX_PI/4);
//D3DXMatrixMultiply(&finalM, &objectM, &rotationM);

D3DXMatrixPerspectiveFovLH(&projectionM,D3DX_PI/4,(float)yRes/xRes, 1, 100);

D3DXVECTOR3 camera;
camera.x = -10;
camera.y = 0;
camera.z = 0;
D3DXVECTOR3 cameraTarget;
cameraTarget.x = 0;
cameraTarget.y = 0;
cameraTarget.z = 0;
D3DXVECTOR3 cameraUp;
cameraUp.x = 0;
cameraUp.y = 1;
cameraUp.z = 0;
D3DXMatrixLookAtLH(&lookAtM,&camera,&cameraTarget, &cameraUp);

hr = pd3dDevice->SetTransform(D3DTS_WORLD, &objectM);
hr = pd3dDevice->SetTransform(D3DTS_PROJECTION, &projectionM);
hr = pd3dDevice->SetTransform(D3DTS_VIEW, &lookAtM);

D3DVIEWPORT9 view_port;

view_port.X=0;
view_port.Y=0;
view_port.Width=xRes;
view_port.Height=yRes;
view_port.MinZ=0.0f;
view_port.MaxZ=1.0f;

pd3dDevice->SetViewport(&view_port);
}

Note of course that some elements may not be needed, placed there just in case during my attempts, this is the code I have currently so we have a common reference.

Thanks in advance for any answers and/or attempts to answer.

Answer 1

In your code (downloaded), xRes and yRes are ints. Due to integer division, yRes/xRes will be zero, because xRes > yRes. You are passing this into the D3DXMatrixPerspextiveFovLH function as the aspect ratio, which will produce an invalid matrix. Instead, cast them to floats first, before doing the division, and pass the result in.