Hi everyone.

My app is a simple modification from the tutorials on the SDK. Where the tutorial draws a triangle, I wanted to draw a Quad.

Then, here is the code I use:

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SimpleVertex vertices[] =

{

D3DXVECTOR3( -0.5f, 0.5f, 0.5f ),

D3DXVECTOR3( 0.5f, 0.5f, 0.5f ),

D3DXVECTOR3( 0.5f, -0.5f, 0.5f),

D3DXVECTOR3( -0.5f, -0.5f, 0.5f),

};

D3D10_BUFFER_DESC bd;

bd.Usage = D3D10_USAGE_DEFAULT;

bd.ByteWidth = sizeof( SimpleVertex ) * 3;

bd.BindFlags = D3D10_BIND_VERTEX_BUFFER;

bd.CPUAccessFlags = 0;

bd.MiscFlags = 0;

D3D10_SUBRESOURCE_DATA InitData;

InitData.pSysMem = vertices;

d3ddev->CreateBuffer( &bd, &InitData, &g_pVertexBuffer );

The code you posted is incomplete.

Thank you for answer.

The problem now is just with the creation of the vertex buffer, so I only post that part of my code (copy and pasted directly from my code).

The only part missing is the Vertex struct definition, but I am going to paste all the code.

#if defined( DEBUG ) || defined( _DEBUG )

// Set the D3D10_SHADER_DEBUG flag to embed debug information in the shaders.

// Setting this flag improves the shader debugging experience, but still allows

// the shaders to be optimized and to run exactly the way they will run in

// the release configuration of this program.

#endif

hr=D3DX10CreateEffectFromFile(L"C:\\temp\\Tutorial02.fx", NULL, NULL, "fx_4_0", dwShaderFlags, 0,

if (hr==D3D10_ERROR_FILE_NOT_FOUND)

MessageBox( NULL, L"The FX file cannot be located. Please run this executable from the directory that contains the FX file.", L"Error", MB_OK );

tecnica=efecto->GetTechniqueByName("Render");

// Define the input layout

{ "POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0, D3D10_INPUT_PER_VERTEX_DATA, 0 },

UINT numElements = sizeof(layout)/sizeof(layout[0]);

// Create the input layout

// Create vertex buffer

bd.ByteWidth = sizeof( SimpleVertex ) * 3;

// Set vertex buffer

UINT stride = sizeof( SimpleVertex );

// Set primitive topology

return;

The first part is the definition block. They are defined as global. From the ********* forward is the code itself. It is included in a function.

bd.ByteWidth = sizeof( SimpleVertex ) * 3;

should be

David Hunt:

bd.ByteWidth = sizeof( SimpleVertex ) * 3;

should be

bd.ByteWidth = sizeof( SimpleVertex ) * 4;

to get four vertices into your buffer.

Also, to draw a quad with four vertices you need to use a triangle strip instead of a triangle list. Otherwise, you would need 6 vertices to draw two triangles.

 

It didn't work. When debuging, just the 3 first vertices are referenced by g_pVertexBuffer.

I corrected the confussion with the primitive type now, thank you.

trogo:

It didn't work. When debuging, just the 3 first vertices are referenced by g_pVertexBuffer.

I find that difficult to believe. If you indeed changed the '3' to a '4', there has to be four vertices in the vertex buffer. Did you also change the '3' to a '4' in your Draw call?

David Hunt:

If you indeed changed the '3' to a '4', there has to be four vertices in the vertex buffer. Did you also change the '3' to a '4' in your Draw call?

Thank you. I had a 3 also in the Draw call, but the problem when debuging is that the pointer to the buffer that returns the CreateBuffer() only references the first 3 vertex, not the 4th.

When compiling again once the Draw() call has been fixed, still appears a triangle on screen, and the pointer to the buffer remains with just 3 vertex.

Can you post your entire source code in a pastebin somewhere and provide a link? There has to be something else going on.

David Hunt:

Can you post your entire source code in a pastebin somewhere and provide a link? There has to be something else going on.

I have post the code almost complete http://pastebin.com/m1579d962

The parts missing are in a DLL created to simplify my code. the DLL contains the SwapChain creation and the renderTargetView assignment, but copy directly from the tutorials on the SDK without any modifications.

One thing I noticed is you need to reverse the last two vertices. For a triangle strip quad, you need the order to be top-left, top-right, bottom-left, bottom-right. I think that might fix the problem.

David Hunt:

One thing I noticed is you need to reverse the last two vertices. For a triangle strip quad, you need the order to be top-left, top-right, bottom-left, bottom-right. I think that might fix the problem.

Thank you very much for your patience.

This finally does the job. Although I thought that in the Vertex Buffer there should be references to all my vertices on the original structure, when debuging, the pointer still keeps storing references to the 3 first vertices. So, I was on the wrong way.

And I have learned 2 things: about the vertices order and about one site called pastebin.com. Thank you again.

You're very welcome!