Many thanks AikonIV,
I''ve been drawing this on a white board to try to better understand it, it seems so easy to do in OpenGL (this is an example I have) but Direct3D sets vertices up differently.
I guess I''m just thinking that by just putting the vertices into the vertex buffer they should be drawn correctly, guess this is completely wrong.
I will email you a screen shot.
Many thanks again.
Steve
terrain looks terrible
In case there was any question, it definitely is your triangle strips. If you want, you can try doing it the way I showed you using triangle lists.
If you''re tired of trying to get this working, I could email you a small demo of how I do it (that is, using an index buffer containing triangle list information.)
Just tell me if you want me to.
If you''re tired of trying to get this working, I could email you a small demo of how I do it (that is, using an index buffer containing triangle list information.)
Just tell me if you want me to.
Hiyas,
Just a gut reaction, and if I had more time I''d look into this more thoroughly, but if you say vertices are stretching across the screen, chances are the variables are initialised incorrectly or at some point set to an incorrect value. I remember having the same thing when coding a worldcraft *.map viewer, and the cause was, if I recall correctly, that some vertices were being calculated incorrectly, prolly a division by zero or something daft which of course made them stretch out to what looked like infinity or near as dammit
Just a gut reaction, and if I had more time I''d look into this more thoroughly, but if you say vertices are stretching across the screen, chances are the variables are initialised incorrectly or at some point set to an incorrect value. I remember having the same thing when coding a worldcraft *.map viewer, and the cause was, if I recall correctly, that some vertices were being calculated incorrectly, prolly a division by zero or something daft which of course made them stretch out to what looked like infinity or near as dammit
Author
Thanks guys,
It''s defo the triangle strips. I wasn''t even making the buffer size big enough to hold them! i.e.for 32x32 should be 32x32x4, 4 being number of vertices for a quad using lists method.
One question though, if I was drawing the quads row by row I''m thinking that the next quad has to have the same y,x value of the previous one ? Two quads below (1 and 2!) I''m taking it that quad 2 has to have same x,y veritces as quad vertices labelled 1 ? Does this make sense ?
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AikonIV, your demo code would be much appreciated, I think I do know how to do this now, took me long time for it to sink in!
Kind regards,
Steve
It''s defo the triangle strips. I wasn''t even making the buffer size big enough to hold them! i.e.for 32x32 should be 32x32x4, 4 being number of vertices for a quad using lists method.
One question though, if I was drawing the quads row by row I''m thinking that the next quad has to have the same y,x value of the previous one ? Two quads below (1 and 2!) I''m taking it that quad 2 has to have same x,y veritces as quad vertices labelled 1 ? Does this make sense ?
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12
AikonIV, your demo code would be much appreciated, I think I do know how to do this now, took me long time for it to sink in!
Kind regards,
Steve
OK, I threw together a little demo using the D3D Matrices tutorial as the base code. I am doing it with multiple triangle strips, which I believe is how you are currently doing it. This code should compile and run with no problem, though it looks kinda stupid b/c I'm just generating random values for my height map rather than reading them in from a file. Will be no problem for you to change. If there are any parts you don't understand/would like explained in greater detail, just say so.
[edited by - AikonIV on March 22, 2003 6:26:17 PM]
#include <d3dx8.h>#include <mmsystem.h>LPDIRECT3D8 g_pD3D = NULL; // Used to create the D3DDeviceLPDIRECT3DDEVICE8 g_pd3dDevice = NULL; // Our rendering deviceLPDIRECT3DVERTEXBUFFER8 g_pVB = NULL; // Buffer to hold verticesstruct CUSTOMVERTEX{ FLOAT x, y, z; // The untransformed, 3D position for the vertex DWORD color; // The vertex color};#define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZ|D3DFVF_DIFFUSE)FLOAT fHeightMap[33*33];HRESULT InitD3D( HWND hWnd ){ // Create the D3D object. if( NULL == ( g_pD3D = Direct3DCreate8( D3D_SDK_VERSION ) ) ) return E_FAIL; // Get the current desktop display mode, so we can set up a back // buffer of the same format D3DDISPLAYMODE d3ddm; if( FAILED( g_pD3D->GetAdapterDisplayMode( D3DADAPTER_DEFAULT, &d3ddm ) ) ) return E_FAIL; // Set up the structure used to create the D3DDevice D3DPRESENT_PARAMETERS d3dpp; ZeroMemory( &d3dpp, sizeof(d3dpp) ); d3dpp.Windowed = TRUE; d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; d3dpp.BackBufferFormat = d3ddm.Format; // Create the D3DDevice if( FAILED( g_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd, D3DCREATE_SOFTWARE_VERTEXPROCESSING, &d3dpp, &g_pd3dDevice ) ) ) { return E_FAIL; } // Turn off culling, so we see the front and back of the triangle g_pd3dDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_NONE ); // Turn off D3D lighting, since we are providing our own vertex colors g_pd3dDevice->SetRenderState( D3DRS_LIGHTING, FALSE ); g_pd3dDevice->SetRenderState(D3DRS_FILLMODE,D3DFILL_WIREFRAME); return S_OK;}//-----------------------------------------------------------------------------// Name: InitGeometry()// Desc: Creates the scene geometry//-----------------------------------------------------------------------------HRESULT InitGeometry(){ for(int i=0;i<33;i++) for(int j=0;j<33;j++) fHeightMap[i+(j*33)] = rand()/25000; if(FAILED(g_pd3dDevice->CreateVertexBuffer(2178*sizeof(CUSTOMVERTEX),D3DUSAGE_WRITEONLY,D3DFVF_CUSTOMVERTEX,D3DPOOL_DEFAULT,&g_pVB))) return E_FAIL; CUSTOMVERTEX* pVertices; if(FAILED(g_pVB->Lock(0,0,(BYTE**)&pVertices,0))) return E_FAIL; DWORD dwBaseVertex = 0; for(int z=0;z<32;z++) { for(int x=0;x<33;x++) { pVertices[dwBaseVertex+(x*2)+0].x = x*1.0; pVertices[dwBaseVertex+(x*2)+0].z = (z+0)*1.0; pVertices[dwBaseVertex+(x*2)+0].y = fHeightMap[x+((z+0)*33)]; pVertices[dwBaseVertex+(x*2)+0].color = 0xFFFFFFFF; pVertices[dwBaseVertex+(x*2)+1].x = x*1.0; pVertices[dwBaseVertex+(x*2)+1].z = (z+1)*1.0; pVertices[dwBaseVertex+(x*2)+1].y = fHeightMap[z+((z+1)*33)]; pVertices[dwBaseVertex+(x*2)+1].color = 0xFFFFFFFF; } dwBaseVertex += 66; //Using 66 vertices per strip } /*for(int x=0;x<33;x++) { for(int y=0;y<33;y++) { pVertices[x+(y*33)].x = x*1.0; pVertices[x+(y*33)].y = rand()/25000.0f;//RAND_MAX; pVertices[x+(y*33)].z = y*1.0; pVertices[x+(y*33)].color = 0xFFFFFFFF; } }*/ g_pVB->Unlock(); return S_OK;}VOID Cleanup(){ if( g_pVB != NULL ) g_pVB->Release(); if( g_pd3dDevice != NULL ) g_pd3dDevice->Release(); if( g_pD3D != NULL ) g_pD3D->Release();}VOID SetupMatrices(){ // For our world matrix, we will just rotate the object about the y-axis. D3DXMATRIX matWorld; //D3DXMATRIX matWorld_Trans; //D3DXMATRIX matWorld_Rot; D3DXMatrixTranslation(&matWorld,-16.0,0.0,-16.0); //D3DXMatrixRotationY(&matWorld_Rot,timeGetTime()/500.0f); //D3DXMatrixMultiply(&matWorld,&matWorld_Trans,&matWorld_Rot); g_pd3dDevice->SetTransform( D3DTS_WORLD, &matWorld ); D3DXMATRIX matView; D3DXMatrixLookAtLH( &matView, &D3DXVECTOR3((-sin(timeGetTime()/1000.0f))*30, 20.0f,(-cos(timeGetTime()/1000.0f))*30), &D3DXVECTOR3(0.0f,0.0f,0.0f), &D3DXVECTOR3(0.0f, 1.0f,0.0f)); g_pd3dDevice->SetTransform( D3DTS_VIEW, &matView ); D3DXMATRIX matProj; D3DXMatrixPerspectiveFovLH( &matProj, D3DX_PI/4, 1.0f, 1.0f, 100.0f ); g_pd3dDevice->SetTransform( D3DTS_PROJECTION, &matProj );}VOID Render(){ // Clear the backbuffer to a black color g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0,0,0), 1.0f, 0 ); // Begin the scene g_pd3dDevice->BeginScene(); // Setup the world, view, and projection matrices SetupMatrices(); // Render the vertex buffer contents g_pd3dDevice->SetStreamSource( 0, g_pVB, sizeof(CUSTOMVERTEX) ); g_pd3dDevice->SetVertexShader( D3DFVF_CUSTOMVERTEX ); for(int i=0;i<32;i++) g_pd3dDevice->DrawPrimitive(D3DPT_TRIANGLESTRIP,i*66,64);//g_pd3dDevice->DrawPrimitive( D3DPT_TRIANGLESTRIP, 0, 1 ); // End the scene g_pd3dDevice->EndScene(); // Present the backbuffer contents to the display g_pd3dDevice->Present( NULL, NULL, NULL, NULL );}LRESULT WINAPI MsgProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam ){ switch( msg ) { case WM_DESTROY: PostQuitMessage( 0 ); return 0; } return DefWindowProc( hWnd, msg, wParam, lParam );}INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR, INT ){ // Register the window class WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L, 0L, GetModuleHandle(NULL), NULL, NULL, NULL, NULL, "D3D Tutorial", NULL }; RegisterClassEx( &wc ); // Create the application's window HWND hWnd = CreateWindow( "D3D Tutorial", "D3D Tutorial 03: Matrices", WS_OVERLAPPEDWINDOW, 100, 100, 256, 256, GetDesktopWindow(), NULL, (HINSTANCE)wc.hInstance, NULL ); // Initialize Direct3D if( SUCCEEDED( InitD3D( hWnd ) ) ) { // Create the scene geometry if( SUCCEEDED( InitGeometry() ) ) { // Show the window ShowWindow( hWnd, SW_SHOWDEFAULT ); UpdateWindow( hWnd ); // Enter the message loop MSG msg; ZeroMemory( &msg, sizeof(msg) ); while( msg.message!=WM_QUIT ) { if( PeekMessage( &msg, NULL, 0U, 0U, PM_REMOVE ) ) { TranslateMessage( &msg ); DispatchMessage( &msg ); } else Render(); } } } // Clean up everything and exit the app Cleanup(); UnregisterClass( "D3D Tutorial", (HINSTANCE)wc.hInstance ); return 0;} [edited by - AikonIV on March 22, 2003 6:26:17 PM]
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