Thread: .X File format and DirectX. Crashing, but why? Damn this world!

My program is crashing, but I really cannot pinpoint the problem. Tried commenting stuff out... debugging, etc...

By the way I was following the example that shipped with DirectX9 SDK on loading meshes.

I've pinpointed the problem to this section of code:

Code:

g_pD3DDevice9->BeginScene();
	
D3DXMATRIXA16 xmatWorld, xmatTemp1, xmatTemp2;

D3DXMatrixTranslation(&xmatWorld, 0.0f,	-2.0f, 10.0f);

D3DXMatrixRotationY(&xmatTemp1, g_fRotAngleY);

D3DXMatrixRotationX(&xmatTemp2, g_fRotAngleX);

xmatWorld = xmatTemp1 * xmatTemp2 * xmatWorld;

g_pD3DDevice9->SetTransform(D3DTS_WORLD, &xmatWorld);	
														for(DWORD i = 0; i < g_dwNumMaterials; i++)
{
  g_pD3DDevice9->SetMaterial(&g_pMeshMaterials[i]);
  g_pMesh->DrawSubset(i);
}

g_pD3DDevice9->EndScene();

g_pD3DDevice9->Present(NULL, NULL, NULL,  NULL);

Code:

bool LoadObjects()
{
  LPD3DXBUFFER pD3DXMtrlBuffer;
	
  D3DXLoadMeshFromX("box.x", D3DXMESH_SYSTEMMEM, g_pD3DDevice9, NULL, &pD3DXMtrlBuffer,	NULL, &g_dwNumMaterials, &g_pMesh);
	
  D3DXMATERIAL *meshData = (D3DXMATERIAL*)pD3DXMtrlBuffer->GetBufferPointer();

  g_pMeshMaterials = new D3DMATERIAL9[g_dwNumMaterials];

  for (DWORD i = 0; i < g_dwNumMaterials; i++)
  {
    g_pMeshMaterials[i] = meshData[i].MatD3D;
    g_pMeshMaterials[i].Ambient = g_pMeshMaterials[i].Diffuse;
 }

 pD3DXMtrlBuffer->Release();

 return true;
}

Code:

g_pMesh->DrawSubset(i);

The above line seems to be my problem. On the first pass through I get the following message but the program continues.

Code:

First-chance exception in Test.exe (KERNEL32.DLL): 0xE06D7363: Microsoft C++ Exception.

Second time through I get

Code:

First-chance exception in Test.exe: 0xC0000005: Access Violation.

and my program crashes. Anyone know what this means?

3DStudioMax7 using Plugin shipped with DirectX9 SDK
Microsoft Visual C++ 6.0

I'm befuddled as when I use the file shipped with the tutorial the program works perfectly fine. (tiger.x)

My box.x is just a simple cube, no materials.

Any ideas? I'm quite peeved at this troublesome problem

Post up the x file you're using and I'll have a look at it later tonight.

Interesting problem. It does seem to be an error with that particular mesh. Either the exporter is handling a case incorrectly or you are upon creation. Maybe there are some settings you need to modify in the plugin. I think there are texcoords but no texture? Odd. Anyway turn your DirectX to debug libraries and debug output all the way up and you'll get this information:

Originally Posted by Debug Output

Direct3D9: Decl Validator: X284: (Element Error) (Decl Element [4]) Declaration can't map to fixed function FVF because a usage+index pair (D3DDECLUSAGE_TANGENT,0) that is not valid for fixed function appears between two vertex elements that have usage+index pairs valid for fixed function. For a vertex declaration to map to fixed function, all individual elements that are valid for fixed function must appear contiguously starting from the first element. Remaining elements at the end do not have to be valid for fixed function, as long as there are few enough that they can be aliased internally to texcoord(n), texcoord(n+1) etc. up to max. texcoord7 (thereby appearing to conform to an FVF, although the aliased values should not be used).

First-chance exception at 0x7c81eb33 in WinMain.exe: Microsoft C++ exception: long @ 0x0012f6d4.
Direct3D9: (ERROR) :DrawIndexedPrimitive failed.

Unhandled exception at 0x7c901230 in WinMain.exe: User breakpoint.

So that would indicate a vertex declaration problem. I haven't used this plugin before but you should double check all the settings and make sure you are only exporting streams that you need.