Unhandled exception during GetFVF

Hello experts,

I'm pretty new to DirectX and Direct3D so it's all still a bit confusing.
I've been given a pre-made "engine" that can easily create and transform several shapes.

When I make a box or teapot it works but when I make anything else I get an unhandled exception in the Draw function of the Mesh at m_pDXMesh->GetFVF()

Anyone have any ideas?
Thanks in advance.
void MeshShape::Init()
{
	//default material color is white
	SetMaterialColor(1,1,1,1);
 
	switch(m_Type)
	{
	case BOX:
		D3DXCreateBox(GETDEVICE,m_a,m_b,m_c,&m_pDXMesh,0);
		break;
	case SPHERE:
		D3DXCreateSphere(GETDEVICE,m_a,(UINT)m_b,(UINT)m_c,&m_pDXMesh,0);
		break;
	case TEAPOT:
		D3DXCreateTeapot(GETDEVICE,&m_pDXMesh,0);
		break;
	case TORUS:
		D3DXCreateTorus(GETDEVICE,m_a,m_b,(UINT)m_c,(UINT)m_d,&m_pDXMesh,0);
		break;
	case CYLINDER:
		D3DXCreateCylinder(GETDEVICE,m_a,m_b,m_c,(UINT)m_d,(UINT)m_e,&m_pDXMesh,0);
		break;
	default:
		D3DXCreateBox(GETDEVICE,1,1,1,&m_pDXMesh,0);
	}
}
 
void MeshShape::Draw() 
{
    GETDEVICE->SetMaterial( &m_Mtrl );
	GETDEVICE->SetTransform( D3DTS_WORLD, &m_FinalWorld );
 
        // THIS LINE GIVES UNHANDLED EXCEPTION
	GETDEVICE->SetFVF( m_pDXMesh->GetFVF() ); 
	m_pDXMesh->DrawSubset(0);
}
 
 
 
void MultiMeshBasisApp::BuildScene()
{
	// This works
	m_pFloor = new MeshShape(MeshShape::BOX,10,0.1f,10);
	m_pFloor->SetMaterialColor(0.6f,0.6f,0.6f,1.0f);
	m_pFloor->Translate(0,-2,4);
	m_pFloor->Draw();
	
 
	// This works too
	m_pTeapot = new MeshShape(MeshShape::TEAPOT,1.0f,2.0f,1.0f);
	m_pTeapot->SetMaterialColor(1.0f,1.0f,0.1f,1.0f);
	m_pTeapot->Translate(3.0f,0.0f,6.0f);
	m_pTeapot->Draw();
 
	// This doesn't
	m_pCylinder = new MeshShape(MeshShape::TORUS,1.0f,2.0f,1.0f);
	m_pCylinder->SetMaterialColor(0.05f,0.2f,0.9f,1.0f);
	m_pCylinder->Translate(0,0,0);
	m_pCylinder->Draw(); // <- Here's the problem
 
}

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LVL 2
SnapplesAsked:
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jgordosConnect With a Mentor Commented:
This is a SWAG, since you don't show the entire program.

You seem to be using global variables, and reusing them, too.

I can think of a lot of things that might be wrong.

Try the following:
See if you can draw the cylinder/torus if you DON'T draw the others....

I.E., change BuildScene to look like this...

void MultiMeshBasisApp::BuildScene()
{
      // This doesn't
      m_pCylinder = new MeshShape(MeshShape::TORUS,1.0f,2.0f,1.0f);
      m_pCylinder->SetMaterialColor(0.05f,0.2f,0.9f,1.0f);
      m_pCylinder->Translate(0,0,0);
      m_pCylinder->Draw(); // <- Here's the problem
}

The next thing i'd try, if that still doesn't work, is to change the call where you build the mesh....

Try hard coding known good values in for hte parameters...  you might be asking the code to build something that isn't quite Kosher, so the resultant mesh is incorrect.

Try changing
D3DXCreateTorus(GETDEVICE,m_a,m_b,(UINT)m_c,(UINT)m_d,&m_pDXMesh,0);
to
D3DXCreateTorus(GETDEVICE,1.0,1.0,1,1,&m_pDXMesh,0);

And then, lastly, you talk about drawing a cylinder, but you're really drawing the torus.

Do you mean this ?

m_pCylinder = new MeshShape(MeshShape::CYLINDER,1.0f,2.0f,1.0f);

-john


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