Hello dudes, I have a problem with my texture. I'm just a beginner so I don't know how to handle it. The best I think what will help is to copy my sourcecode and compile it to see what's wrong coz I really don't know how to describe it correctly sorry. Help would be really appreciate and needed ! The problem in general is, that the texure is devided in 2 Triangles and one side of the Triangle is scrambled ... ??? So here is my source code: #include <windows.h> #include <d3dx9.h> #include <d3d9.h> #pragma comment(lib, "d3dx9.lib") #pragma comment(lib, "d3d9.lib") //Definition vom Vertex Koord.i.Modelspace Texturkoord. werden benutzt #define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZ | D3DFVF_DIFFUSE | D3DFVF_TEX1) HDC hDC = NULL; // Private GDI Schnittstelle HWND hWnd = NULL; HINSTANCE hInstance; // Haltet die Instanz der Applikation LPDIRECT3D9 pD3D = NULL; // DirectX 3D Version 9 LPDIRECT3DDEVICE9 pD3DDevice = NULL; // DirectX 3D Render Schnittstelle LPDIRECT3DTEXTURE9 pTexture = NULL; bool keys[256]; // Array für Keyboard Routine bool active=TRUE; // Window Active Flag Set TRUE By Default bool fullscreen=TRUE; // Fullscreen Flag Set To Fullscreen Mode By Default IDirect3DVertexBuffer9 *pVertexBuffer = NULL; // Vertex Buffer struct my_vertex{ FLOAT x, y, z; // untransformierte Position vom Vertex. FLOAT tu, tv; // Texturkoordinaten }; //* Würfelkoordinaten * my_vertex g_vertices[] ={ // Würfelkoordinaten | Texturkoordinaten // X Y Z X Y { -1.0f, -1.0f, -1.0f, 0.0f, 1.0f }, //Front { -1.0f, 1.0f, -1.0f, 0.0f, 0.0f }, { 1.0f, 1.0f, -1.0f, 1.0f, 0.0f }, { 1.0f, 1.0f, -1.0f, 1.0f, 0.0f }, { 1.0f, -1.0f, -1.0f, 1.0f, 1.0f }, { -1.0f, -1.0f, -1.0f, 0.0f, 1.0f }, { 1.0f, -1.0f, 1.0f, 0.0f, 1.0f }, //Back { 1.0f, 1.0f, 1.0f, 0.0f, 0.0f }, { -1.0f, 1.0f, 1.0f, 1.0f, 0.0f }, { -1.0f, 1.0f, 1.0f, 1.0f, 0.0f }, { -1.0f, -1.0f, 1.0f, 1.0f, 1.0f }, { 1.0f, -1.0f, 1.0f, 0.0f, 1.0f }, { -1.0f, 1.0f, -1.0f, 0.0f, 1.0f }, //Top { -1.0f, 1.0f, 1.0f, 0.0f, 0.0f }, { 1.0f, 1.0f, 1.0f, 1.0f, 0.0f }, { 1.0f, 1.0f, 1.0f, 1.0f, 0.0f }, { 1.0f, 1.0f, -1.0f, 1.0f, 1.0f }, { -1.0f, 1.0f, -1.0f, 0.0f, 1.0f }, { 1.0f, -1.0f, -1.0f, 0.0f, 1.0f }, //Bottom { 1.0f, -1.0f, 1.0f, 0.0f, 0.0f }, { -1.0f, -1.0f, 1.0f, 1.0f, 0.0f }, { -1.0f, -1.0f, 1.0f, 1.0f, 0.0f }, { -1.0f, -1.0f, -1.0f, 1.0f, 1.0f }, { 1.0f, -1.0f, -1.0f, 0.0f, 1.0f }, { -1.0f, -1.0f, 1.0f, 0.0f, 1.0f }, //Left { -1.0f, 1.0f, 1.0f, 0.0f, 0.0f }, { -1.0f, 1.0f, -1.0f, 1.0f, 0.0f }, { -1.0f, 1.0f, -1.0f, 1.0f, 0.0f }, { -1.0f, -1.0f, -1.0f, 1.0f, 1.0f }, { -1.0f, -1.0f, 1.0f, 0.0f, 1.0f }, { 1.0f, -1.0f, -1.0f, 0.0f, 1.0f }, //Right { 1.0f, 1.0f, -1.0f, 0.0f, 0.0f }, { 1.0f, 1.0f, 1.0f, 1.0f, 0.0f }, { 1.0f, 1.0f, 1.0f, 1.0f, 0.0f }, { 1.0f, -1.0f, 1.0f, 1.0f, 1.0f }, { 1.0f, -1.0f, -1.0f, 0.0f, 1.0f }, }; #define NUM_VERTICES (sizeof(g_vertices)/sizeof(my_vertex)) LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); // Deklaration für WndProc void ReSizeD3DScene(int width, int height) // Resize und Initialisierung vom D3D Fenster { if (height==0) // Vorbeugen von (Nulldivision) Zero durch { height=1; // Height 1 setzen } D3DXMATRIX projection_matrix; D3DXMatrixPerspectiveFovLH(&projection_matrix, 45.0f, (float)width/(float)height, 0.1f, 100.0f ); pD3DDevice->SetTransform( D3DTS_PROJECTION, &(D3DMATRIX)projection_matrix ); D3DXMatrixIdentity(&projection_matrix); } int InitD3D() // Setup Für D3D { pD3DDevice->SetRenderState(D3DRS_ZENABLE, TRUE ); // ZBUFFER pD3DDevice->SetRenderState(D3DRS_CULLMODE, FALSE); // Backface Culling pD3DDevice->SetRenderState(D3DRS_LIGHTING, FALSE); // Licht pD3DDevice->SetTextureStageState(0,D3DTSS_COLOROP, D3DTOP_SELECTARG1); pD3DDevice->SetTextureStageState(0,D3DTSS_COLORARG1, D3DTA_TEXTURE); pD3DDevice->SetTextureStageState(0,D3DTSS_ALPHAOP, D3DTOP_DISABLE); pD3DDevice->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_ANISOTROPIC); pD3DDevice->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_ANISOTROPIC); pD3DDevice->SetSamplerState(0, D3DSAMP_MIPFILTER, D3DTEXF_ANISOTROPIC); D3DXCreateTextureFromFile( pD3DDevice, "DH.bmp",&pTexture); pD3DDevice->CreateVertexBuffer( 24*sizeof(g_vertices),0, D3DFVF_CUSTOMVERTEX, D3DPOOL_DEFAULT, &pVertexBuffer, NULL ); unsigned char *pVertices = NULL; pVertexBuffer->Lock( 0, sizeof(g_vertices), (void**)&pVertices, 0 ); memcpy( pVertices, g_vertices, sizeof(g_vertices) ); pVertexBuffer->Unlock(); return TRUE; //Initialisierung OK } int DrawD3DScene() // Zeichnen { pD3DDevice->Clear( 0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, // Clear Screen und Depth Buffer D3DCOLOR_COLORVALUE(0.0f,0.0f,0.0f,0.0f), 1.0f, 0 ); static float rotqube = 0.0f; //Rotationsgeschwindigkeit rotqube += 0.4f; D3DXMATRIX matWorld; // World Matrix D3DXMATRIX matTranslation; // Translation Matrix D3DXMATRIX matRotX; // X Achse Rotations Matrix D3DXMATRIX matRotY; // Y Achse Rotations Matrix D3DXMATRIX matRotZ; // Z Achse Rotations Matrix D3DXMATRIX matRotXYZ; // XYZ Rotations Matrix D3DXMatrixTranslation( &matTranslation, 0.0f, 0.0f, 5.0f ); D3DXMatrixRotationY(&matRotY, D3DXToRadian(rotqube)); // Rotation in Y Richtung D3DXMatrixRotationX(&matRotX, D3DXToRadian(rotqube)); // Rotation in X Richtung D3DXMatrixRotationY(&matRotY, D3DXToRadian(rotqube)); // Rotate In Z Richtung D3DXMatrixRotationZ(&matRotZ, D3DXToRadian(rotqube)); D3DXMatrixRotationYawPitchRoll( &matRotX, D3DXToRadian(rotqube), D3DXToRadian(rotqube), D3DXToRadian(rotqube) ); matWorld = (matRotY * matRotX * matRotZ) * matTranslation; pD3DDevice->SetTransform( D3DTS_WORLD, &matWorld ); // Setup Transformation pD3DDevice->BeginScene(); // Begin der Direct3D Szene pD3DDevice->SetStreamSource( 0, pVertexBuffer, 0, sizeof(my_vertex) ); pD3DDevice->SetFVF( D3DFVF_CUSTOMVERTEX ); pD3DDevice->DrawPrimitive(D3DPT_TRIANGLELIST,0,NUM_VERTICES/3); //Würfel zeichnen pD3DDevice->EndScene(); // Ende der Direct3D Szene pD3DDevice->Present( NULL, NULL, NULL, NULL );// Ergebnis anzeigen pD3DDevice->SetTexture( 0, pTexture ); return TRUE; } void KillD3DScene() { if( pVertexBuffer != NULL ) { pVertexBuffer->Release(); // Vertex Buffer freimachen pVertexBuffer = NULL; pTexture->Release(); pTexture=NULL; } } void KillD3DWindow() // Fenster schliessen { if (pD3DDevice != NULL) pD3DDevice->Release(); // D3D Schnittstelle freimachen if (pD3D != NULL) pD3D->Release(); // D3D Schnittstelle freimachen if (fullscreen) // Vollbildabfrage { ChangeDisplaySettings(NULL,0); // Wenn ja, zurück zum Desktop ShowCursor(TRUE); // Mauszeiger anzeigen } if (hDC && !ReleaseDC(hWnd,hDC)) // Kann DC freigemacht werden { MessageBox(NULL,"Release Device Context Fehlgeschlagen.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION); hDC=NULL; // DC NULL setzen } if (hWnd && !DestroyWindow(hWnd)) // Kann man Fenster schliessen { MessageBox(NULL,"Fenster konnte nicht entfernt werden -> hWnd.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION); hWnd=NULL; // hWnd NULL setzen } if (!UnregisterClass("Direct3D",hInstance)) // Kann man Klasse unregistrieren { MessageBox(NULL,"Programm konnte nicht korrekt abgemeldet werden.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION); hInstance=NULL; // hInstance NULL setzen } } //============================================================================================ // Fenstergenerierung //=========================================================================================== BOOL CreateD3DWindow(char* title, int width, int height, bool fullscreenflag) { WNDCLASS wc; DWORD dwExstyle; // Fenster Extended style DWORD dwstyle; // Fenster aussehen RECT WindowRect; // Werte Dreieck oben links / unten rechts WindowRect.left=(long)0; // Linkswert 0 WindowRect.right=(long)width; // Rechtswert auf angeforderte Breite WindowRect.top=(long)0; // Wert oben 0 WindowRect.bottom=(long)height; // Wert oben auf angeforderte Höhe fullscreen=fullscreenflag; // Globaler Fullscreen Flag hInstance = GetModuleHandle(NULL); wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC; wc.lpfnWndProc = (WNDPROC) WndProc; wc.cbClsExtra = 0; wc.cbWndExtra = 0; wc.hInstance = hInstance; wc.hIcon = LoadIcon(NULL, IDI_WINLOGO); // Icon wc.hCursor = LoadCursor(NULL, IDC_CROSS); // Mauszeiger wc.hbrBackground = NULL; // Hintergrund D3D aber 0 wc.lpszMenuName = NULL; // Menü, aber 0 wc.lpszClassName = "Direct3D"; // Klasse if (!RegisterClass(&wc)) // Fenster registrieren { MessageBox(NULL,"Registrieren der Window Klasse fehlgeschlagen.","ERROR",MB_OK|MB_ICONEXCLAMATION); return FALSE; } if (fullscreen) // Vollbild? { dwExstyle=WS_EX_APPWINDOW; dwstyle=WS_POPUP; ShowCursor(FALSE); // Mauszeiger verstecken } else { dwExstyle=WS_EX_APPWINDOW | WS_EX_WINDOWEDGE; dwstyle=WS_OVERLAPPEDWINDOW; } AdjustWindowRectEx(&WindowRect, dwstyle, FALSE, dwExstyle); // Fenster einstellen auf angeforderte Größe // Create The Window if (!(hWnd=CreateWindowEx( dwExstyle, "Direct3D", // Klassenname title, // Fenstername dwstyle | // Definierter Fenster style WS_CLIPSIBLINGS | // Benötigter Fenster style WS_CLIPCHILDREN, // Benötigter Fenster style 0, 0, // Fenster Position WindowRect.right-WindowRect.left, // Fenster Breite anpassen WindowRect.bottom-WindowRect.top, // Fenster Höhe anpassen NULL, // Kein parent Window NULL, // Kein Menü hInstance, NULL))) { KillD3DWindow(); // Reset Anzeige MessageBox(NULL,"Fenstererzeugungsfehler.","ERROR",MB_OK|MB_ICONEXCLAMATION); return FALSE; } if (!(hDC=GetDC(hWnd))) // Schnittstellen Context ? { KillD3DWindow(); MessageBox(NULL,"Kann keinen Schnittstellen Contex erzeugen.","ERROR",MB_OK|MB_ICONEXCLAMATION); return FALSE; // Return FALSE } pD3D = Direct3DCreate9(D3D_SDK_VERSION); // Abfrage DX Version if ( pD3D == NULL ) { KillD3DWindow(); MessageBox(NULL,"Kann DirectX SDK Version 9.x nicht finden","ERROR",MB_OK|MB_ICONEXCLAMATION); return FALSE; } D3DPRESENT_PARAMETERS d3dpp= // d3dpp übergibt Paramter Windows { width, // Back Buffer Breite height, // Back Buffer Höhe D3DFMT_R5G6B5, // Back Buffer Format (Farbtiefe) 1, // Back Buffer Zählen (Double Buffer) D3DMULTISAMPLE_NONE, 0, D3DSWAPEFFECT_DISCARD, hWnd, !fullscreen, // Fenster oder Vollbild TRUE, D3DFMT_D16, // 16Bit Z-Buffer (Depth Buffer) 0, D3DPRESENT_RATE_DEFAULT, // Refresh Rate auf default D3DPRESENT_INTERVAL_DEFAULT }; // Surface Format überprüfen if ( FAILED( pD3D->CheckDeviceFormat( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, d3dpp.BackBufferFormat, D3DUSAGE_DEPTHSTENCIL, D3DRTYPE_SURFACE, d3dpp.AutoDepthStencilFormat ) ) ) { KillD3DWindow(); // Reset The Display MessageBox(NULL,"Surface Format nicht gefunden.","ERROR",MB_OK|MB_ICONEXCLAMATION); return FALSE; // Return FALSE } // DirectX 3D Schnittstelle überprüfen if(FAILED( pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd, D3DCREATE_SOFTWARE_VERTEXPROCESSING, &d3dpp, &pD3DDevice ) ) ) { KillD3DWindow(); MessageBox(NULL,"Kann DirectX 3D Schnittstelle nicht erzeugen.","ERROR",MB_OK|MB_ICONEXCLAMATION); return FALSE; } ShowWindow(hWnd,SW_SHOW); // Fenster anzeigen SetForegroundWindow(hWnd); SetFocus(hWnd); // Focus setzen ReSizeD3DScene(width, height); // Perspektive setzen if (!InitD3D()) // D3D Fenster initialisieren { KillD3DWindow(); MessageBox(NULL,"Initialisierung fehlgeschlagen.","ERROR",MB_OK|MB_ICONEXCLAMATION); return FALSE; } return TRUE; } LRESULT CALLBACK WndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam ) // MESSAGEHANDLER { switch( uMsg ) { case WM_ACTIVATE: // Aktive Nachricht ? { if (!HIWORD(wParam)) // Minimiert ? { active=TRUE; // Programm aktiv } else { active=FALSE; // Programm inaktiv } return 0; } case WM_SYSCOMMAND: { switch (wParam) { case SC_SCREENSAVE: // Screensaver start ? case SC_MONITORPOWER: // Energiemodus aktiv ? return 0; } break; } case WM_CLOSE: // Close Nachricht erhalten? { PostQuitMessage(0); // Quit Message senden return 0; } case WM_KEYDOWN: // Taste gedrückt? { keys[wParam] = TRUE; // Falls ja TRUE return 0; } case WM_KEYUP: // Taste nicht gedrückt? { keys[wParam] = FALSE; // Falls ja FALSE return 0; } case WM_SIZE: // Direct3D Fenster neue Größe { if(!fullscreen) ReSizeD3DScene(LOWORD(lParam), HIWORD(lParam)); // LoWord=Breite, HiWord=Höhe return 0; } } // Alle unbehandelten Nachrichten an DefWindowProc senden return DefWindowProc(hWnd,uMsg,wParam,lParam); } int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow ) { MSG msg; BOOL done=FALSE; // Bool Variable um aus Schleife zu kommen // Welcher Bildschirmmodus ? if (MessageBox(NULL,"F1 - Vollbildmodus \nF2 - ZBUFFER aus\nESC - Programm beenden", "Funktionstasten",MB_OK|MB_ICONINFORMATION|MB_DEFBUTTON2==IDNO)==IDOK) { fullscreen=FALSE; // Fenstermodus } // Create Our DirectX 3D Window if (!CreateD3DWindow("Projekt Graphik (C) 2005 by CP ",1024,768,fullscreen)) { return 0; // Quit wenn Fenster nicht erzeugt } while(!done) // Schleife done=FALSE { if (PeekMessage(&msg,NULL,0,0,PM_REMOVE)) // Wartet Nachricht ? { if (msg.message==WM_QUIT) // Quit Nachricht ? { done=TRUE; // If So done=TRUE } else { TranslateMessage(&msg); DispatchMessage(&msg); } } else // Wenn keine Nachrichten vorhanden { // Zeichnen der Szene. Abfragen von ESC Key und DrawD3DScene() if ((active && !DrawD3DScene()) || keys[VK_ESCAPE]) // Active? Quit erhalten? { done=TRUE; // ESC DrawD3DScene } //ZBUFFER ausschalten mit F2 if (keys[VK_F2]) { pD3DDevice->SetRenderState(D3DRS_ZENABLE, FALSE ); // Enable Z-Buffer (Depth Buffer) pD3DDevice->SetRenderState(D3DRS_CULLMODE, FALSE); // Disable Backface Culling pD3DDevice->SetRenderState(D3DRS_LIGHTING, FALSE); // Disable Light pD3DDevice->SetTextureStageState(0,D3DTSS_COLOROP, D3DTOP_SELECTARG1); pD3DDevice->SetTextureStageState(0,D3DTSS_COLORARG1, D3DTA_TEXTURE); pD3DDevice->SetTextureStageState(0,D3DTSS_ALPHAOP, D3DTOP_DISABLE); D3DXCreateTextureFromFile( pD3DDevice, "tex.bmp",&pTexture); pD3DDevice->CreateVertexBuffer( 24*sizeof(g_vertices),0, D3DFVF_CUSTOMVERTEX, D3DPOOL_DEFAULT, &pVertexBuffer, NULL ); unsigned char *pVertices = NULL; pVertexBuffer->Lock( 0, sizeof(g_vertices), (void**)&pVertices, 0 ); memcpy( pVertices, g_vertices, sizeof(g_vertices) ); pVertexBuffer->Unlock(); } // ZBUFFER mit F3 einschalten if (keys[VK_F3]) { pD3DDevice->SetRenderState(D3DRS_ZENABLE, TRUE ); // Enable Z-Buffer (Depth Buffer) pD3DDevice->SetRenderState(D3DRS_CULLMODE, FALSE); // Disable Backface Culling pD3DDevice->SetRenderState(D3DRS_LIGHTING, FALSE); // Disable Light pD3DDevice->SetTextureStageState(0,D3DTSS_COLOROP, D3DTOP_SELECTARG1); pD3DDevice->SetTextureStageState(0,D3DTSS_COLORARG1, D3DTA_TEXTURE); pD3DDevice->SetTextureStageState(0,D3DTSS_ALPHAOP, D3DTOP_DISABLE); D3DXCreateTextureFromFile( pD3DDevice, "tex.bmp",&pTexture); pD3DDevice->CreateVertexBuffer( 24*sizeof(g_vertices),0, D3DFVF_CUSTOMVERTEX, D3DPOOL_DEFAULT, &pVertexBuffer, NULL ); unsigned char *pVertices = NULL; pVertexBuffer->Lock( 0, sizeof(g_vertices), (void**)&pVertices, 0 ); memcpy( pVertices, g_vertices, sizeof(g_vertices) ); pVertexBuffer->Unlock(); } // Vollbild aktivieren mit F1 if (keys[VK_F1]) // F1 gedrückt ? { keys[VK_F1]=FALSE; // Wenn ja key = false KillD3DWindow(); fullscreen=!fullscreen; // Vollbild / Fenstermodus // D3D Fenster neu machen if (!CreateD3DWindow("Projekt Graphik (C) 2005 by CP",1024,768,fullscreen)) { return 0; // Quit wenn kein Fenster erzeugt wurde } } } } // Shutdown KillD3DWindow(); return (msg.wParam); // Exit }

"#define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZ | D3DFVF_DIFFUSE | D3DFVF_TEX1)"

you define your vertex to have diffuse data, but in your vertex structure:

struct my_vertex{
FLOAT x, y, z; // untransformierte Position vom Vertex.
FLOAT tu, tv; // Texturkoordinaten
};

you just define XYZ and u,v1...
your vertex structure should be:


struct my_vertex{
FLOAT x, y, z; // untransformierte Position vom Vertex.
DWORD Diffuse; // diffuse component
FLOAT tu, tv; // Texturkoordinaten
};

.....
this will problably cause your "fault" texturing. becase your FVF sais your vertex structure is 12+4+8 byte, but you define your structure as 12+8 byte, which lead to missreading in your vertexbuffer.

Sorry for the /source Tag didn't know that -> next time ^^

Your ideas didn't work so far sorry but I've made a screenshot of my problem click here


click


Thanks for your help btw

Check your uv coordinates....
anyway, you should match the size of your vertex structure with your FVF when using Fixed Function pipeline.

Which of the faces are you rendering(the one on the picture above)?

@ Kuba your change to the vertex changed something. Seems nice, but not that what I wanted

Here is a screenshot of your idea or what happened after I changed it

it has something to do with the DWORD Diffuse command

click


I want to show all faces of the cube coz it's rotating

Thank you very much for your help

this is problably your error:
"{ -1.0f, -1.0f, -1.0f, 0.0f, 1.0f }, //Front"

now you are setting position to (-1,-1,-1) and then the Diffuse component to 0 and the u coordinate to 0, BUT!...the v koordinate is undefined...change it to:

"{ -1.0f, -1.0f, -1.0f, 0, 0.0f, 1.0f }, //Front"

that is, put a 0 before your uv coordinates( the fourth component)
compare this to your new vertex structure:

struct my_vertex{
FLOAT x, y, z; // untransformierte Position vom Vertex.
DWROD Diffuse;
FLOAT tu, tv; // Texturkoordinaten
};

and you will se that the fourth component is the Diffuse component

and do the same to all your vertex definitions...


"pD3DDevice->CreateVertexBuffer( 24*sizeof(g_vertices),0, D3DFVF_CUSTOMVERTEX,
D3DPOOL_DEFAULT, &pVertexBuffer, NULL );"

your are creating 24 cubes? is this your purpose?

put this:
"pD3DDevice->SetTexture( 0, pTexture );"

before this:
pD3DDevice->DrawPrimitive(D3DPT_TRIANGLELIST,0,NUM_VERTICES/3); //Würfel zeichnen

@ Keba

YIPIEEEEEE that was it to put the 0' to the Vertex Coordinates

Could you please describe what the diffuse component is or what it makes

And thank you 10000 times you saved my day :)

The 24 doesn't mean 24 cubes it means 24 points to draw the cube


Uhm would it be very difficult to put a normal standard light to the scene ?

1. The diffuse component is setting a color to your Triangles in the format ARGB(Alpha, Red, Green, Blue).
To use it when rendering change:
"pD3DDevice->SetTextureStageState(0,D3DTSS_COLOROP, D3DTOP_SELECTARG1);
pD3DDevice->SetTextureStageState(0,D3DTSS_COLORARG1, D3DTA_TEXTURE);
pD3DDevice->SetTextureStageState(0,D3DTSS_ALPHAOP, D3DTOP_DISABLE);"

to

"pD3DDevice->SetTextureStageState(0,D3DTSS_COLOROP, D3DTOP_MODULATE);
pD3DDevice->SetTextureStageState(0,D3DTSS_COLORARG1, D3DTA_TEXTURE);
pD3DDevice->SetTextureStageState(0,D3DTSS_COLORARG2, D3DTA_DIFFUSE);
pD3DDevice->SetTextureStageState(0,D3DTSS_ALPHAOP, D3DTOP_DISABLE);"

the modulate command informs D3D to use the diffuse component multiplyed with the texture color as the final pixel color.
the alpha part in the diffuse component is used for transparency, but when you are adding: "pD3DDevice->SetTextureStageState(0,D3DTSS_ALPHAOP, D3DTOP_DISABLE);" Alpha is disabled in this texturestage. search for D3DTOP_MODULATE and D3DTA_TEXTURE in the SDK Documetns for more information about operators and operands.

2. when you write:
"pD3DDevice->CreateVertexBuffer( 24*sizeof(g_vertices),0, D3DFVF_CUSTOMVERTEX,
D3DPOOL_DEFAULT, &pVertexBuffer, NULL );"

you are telling DX to create a vertex buffer with 24 elements that got the size of g_vertices, which in turn is 36 vertices with the size of your my_vertex structres, that is, you are allocatin memory for 24 cubes, but only using one.

"pD3DDevice->CreateVertexBuffer( 24*sizeof(my_vertex),0, D3DFVF_CUSTOMVERTEX,
D3DPOOL_DEFAULT, &pVertexBuffer, NULL );"

would be more likley, here you are telling DX to create 24 vertices that has the size of your my_vertex struct, but! as you are rendering with TRILIST, you cwould need 36 vertices, which is the amount of vertices that you are createing. so correct in this case would be:

pD3DDevice->CreateVertexBuffer( 36*sizeof(my_vertex),0, D3DFVF_CUSTOMVERTEX,
D3DPOOL_DEFAULT, &pVertexBuffer, NULL ) Which tells DX to create 36 vertices that has the size of my_vertex, which are the totaly amount of vertices you use.

3.

Adding a standard light to your program would be easy.
1. Add normal component to your my_vertex structure:

struct my_vertex{
FLOAT x, y, z; // untransformierte Position vom Vertex.
FLOAT nx,ny,nz; // Normal
DWORD Diffuse; // Diffuse
FLOAT tu, tv; // Texturkoordinaten
};

2. Change the FVF specification to : #define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZ | D3DFVF_NORMAL | D3DFVF_DIFFUSE | D3DFVF_TEX1)


3. setting upp the vertices definitions correct(as with the diffuse component). add the normals,as you can se in your new structure, after the positions

4. Create a material
5. create a Light

// in render loop.

6. Attach Light
7. Attach material
8. Render

for more clarification on part 4-8 se this

Hello again, I just found out, that if I start the compiled .exe file I just see a black window and no cube anymore. If I compile it directly within the compiler which is Visual Studio all is fine.

Any ideas ?

The SDK Include/Library Files are defined in the compiler