3 replies to this topic

[f1engineer]

Dear Sirs

I try to make mesh by creating vertex buffer and index buffer as next code:

void CD3DSimulationView::CreateMeshes()
{
	unsigned short nNumFaces = 12;
	unsigned short nNumVertices = 8;
	
	D3DXCreateMeshFVF(nNumFaces, nNumVertices, D3DXMESH_VB_MANAGED, D3DFVF_XYZ, m_pd3dDevice, &m_pMesh);

	//m_pMesh - is object declared in CD3DSimulationView
	
	CUSTOMVERTEX* pVertices;
	m_pMesh->LockVertexBuffer(D3DLOCK_DISCARD, (void**)&pVertices);
	
	float front   = -1.0;
	float back    =  1.0;
	
	float left    = -1.0;
	float right   =  1.0;
	
	float top     =  1.0;
	float bottom  = -1.0;
	
	pVertices[0].m_pVertices = D3DXVECTOR3(left, bottom, front);
	pVertices[1].m_pVertices = D3DXVECTOR3(right, bottom, front);
	
	pVertices[2].m_pVertices = D3DXVECTOR3(left, top, front);
	pVertices[3].m_pVertices = D3DXVECTOR3(right, top, front);
	
	pVertices[4].m_pVertices = D3DXVECTOR3(left, bottom, back);
	pVertices[5].m_pVertices = D3DXVECTOR3(right, bottom, back);
	
	pVertices[6].m_pVertices = D3DXVECTOR3(left, top, back);
	pVertices[7].m_pVertices = D3DXVECTOR3(right, top, back);
	
	m_pMesh->UnlockVertexBuffer();
	
	UINT *pIB = NULL;
	m_pMesh->LockIndexBuffer( 0, (void**)&pIB);
	
	short leftbottomfront   = 0; 
	short rightbottomfront  = 1; 
	short lefttopfront      = 2; 
	short righttopfront     = 3;
	short leftbottomback    = 4;
	short rightbottomback   = 5; 
	short lefttopback       = 6;
	short righttopback      = 7; 
	
	pIB[0] = lefttopfront;
	pIB[1] = lefttopback;
	pIB[2] = leftbottomback;
	
	pIB[3] = leftbottomback;
	pIB[4] = leftbottomfront;
	pIB[5] = lefttopfront;
	
	pIB[6] = lefttopfront;
	pIB[7] = leftbottomfront;
	pIB[8] = rightbottomfront;
	
	pIB[9] = rightbottomfront;
	pIB[10] = righttopfront;
	pIB[11] = lefttopfront;
	
	pIB[12] = righttopback;
	pIB[13] = righttopfront;
	pIB[14] = rightbottomfront;
	
	pIB[15] = rightbottomfront;
	pIB[16] = rightbottomback;
	pIB[17] = righttopback;
	
	pIB[18] = leftbottomback;
	pIB[19] = lefttopback;
	pIB[20] = righttopback;
	
	pIB[21] = righttopback;
	pIB[22] = rightbottomback;
	pIB[23] = leftbottomback;
	
	pIB[24] = righttopfront;
	pIB[25] = righttopback;
	pIB[26] = lefttopback;
	
	pIB[27] = lefttopback;
	pIB[28] = lefttopfront;
	pIB[29] = righttopfront;
	
	pIB[30] = leftbottomfront;
	pIB[31] = leftbottomback;
	pIB[32] = rightbottomback;
	
	pIB[33] = rightbottomback;
	pIB[34] = rightbottomfront;
	pIB[35] = leftbottomfront;
	
	m_pMesh->UnlockIndexBuffer();
	
	Render();
}

But when I run render process of the created mesh, no object on the screan appear as I expect.
I need to create parallelipiped. What is that I miss in my function.

Is it possible to send me some examples or links that I shall be able to find more information.

Sincerely Yours
Kamen

[Reedbeta]

For future reference, the tags are [code]...[/code], not <source>...</source>.

[starstutter]

I'm not %100 sure this is your problem, but I notice your not setting the attribute buttfer with anything:

             DWORD *att = 0;

	m_pMesh->LockAttributeBuffer(0,&att);

	memset(att, 0, sizeof(DWORD)*nNumFaces);

	m_pMesh->UnlockAttributeBuffer();

this will make it so that when you say "mesh->DrawSubset(0);", that '0' will actually have meaning. If you don't know what the attribute buffer does, it's kind of like it sounds. It attributes verticies and triangles to different drawing levels.

Like for instance, on a person mesh, putting all your body verticeis in "attribute 0", and then putting the head vertices in "attribute 1", will make it so:

DrawSubset(0); //draws only the body and not the head

DrawSubset(1); //draws only the head and not the body

If you don't define all these, it assumes that there are 0 verticies to draw in "attribute 0".


Other than this I can only recommend:
- Double check to see if your index buffer is correct
- Make sure that you have alpha off and that your mesh is just not visible (I'm guilty of it)
- Make sure that your mesh isn't just drawing in a place you can't see, sounds like a dumb mistake, but again, done it too many times

[f1engineer]

Thank You Sir for comprehensive answer.