Shadow Maps | GameDev.net

jsaade · 2006-05-23T07:40:44+00:00

I have been trying to use shadow maps in my game. I followed the D3D sample (Dx9) as my game is using dx9. I am doing a flight sim. so my world is mostly outdoors. I am still in early stages of shadow implementation, so i am having some bugs, the rendering of the plane using the same way of the sample works, fine, but if i try with other big models (ex: the terrain), the rendering becomes messed up …

sorry about the earlier post, i was a bit in a hurry so here is more explanation about my program:

1st initializing the light:

Lights.push_back(new LightStruct());D3DXVECTOR3 vecDir;ZeroMemory( &(Lights[0]->lt), sizeof(D3DLIGHT9) );Lights[0]->lt.Type = D3DLIGHT_SPOT ;//Lights[0]->lt.Position = D3DXVECTOR3( 0, 1000.0f, -780 );Lights[0]->lt.Position = D3DXVECTOR3( -150, 100, -780 );Lights[0]->lt.Direction = D3DXVECTOR3( 1, -1, 0 );Lights[0]->lt.Range = 10000;//Lights[0]->lt.Attenuation0 =1;Lights[0]->lt.Diffuse.a = 1.0f;		Lights[0]->lt.Diffuse.r = 1.0;Lights[0]->lt.Diffuse.g = 1.0f;Lights[0]->lt.Diffuse.b = 1.0f;Lights[0]->lt.Ambient =  Lights[0]->lt.Specular = Lights[0]->lt.Diffuse;Lights[0]->lt.Theta = 1;Lights[0]->lt.Phi = 1;Game::g_pd3dDevice->SetLight( 0, &(Lights[0]->lt) );Game::g_pd3dDevice->LightEnable( 0, TRUE );Game::g_pd3dDevice->SetRenderState( D3DRS_LIGHTING, TRUE );

2nd the models and textures are loaded correctly, i tested them with
Drawsubset dx function, in my structure, i have a plane object
and static objects (a bsp is built for these but for now lets say they are objects inside an instance called map.
so normal rendering calling:
mymap->Update();
plane->Render();
gives:
normal dx render

so now i started implementing the shadow map.
on initialization, i create the shadow map and surface:

DWORD dwShaderFlags = D3DXFX_NOT_CLONEABLE;#ifdef DEBUG_VS    dwShaderFlags |= D3DXSHADER_FORCE_VS_SOFTWARE_NOOPT;#endif#ifdef DEBUG_PS    dwShaderFlags |= D3DXSHADER_FORCE_PS_SOFTWARE_NOOPT;#endifD3DXCreateEffectFromFile( Game::g_pd3dDevice, "shadowmap.fx", NULL, NULL, dwShaderFlags,                                 NULL, &g_pEffect, NULL );g_pEffect->SetVector( "g_vLightDiffuse", (D3DXVECTOR4 *)&Lights[0]->lt.Diffuse ) ;g_pEffect->SetFloat( "g_fCosTheta", cosf( Lights[0]->lt.Theta ));// Create the shadow map textureGame::g_pd3dDevice->CreateTexture( 512, 512,                                        1, D3DUSAGE_RENDERTARGET,                                        D3DFMT_R32F,                                        D3DPOOL_DEFAULT,                                        &g_pShadowMap,                                        NULL );// Create the depth-stencil bufferGame::g_pd3dDevice->CreateDepthStencilSurface(  512,												512,												D3DFMT_D16,								D3DMULTISAMPLE_NONE,												0,												TRUE,												&g_pDSShadow,												NULL );// Initialize the shadow projection matrix float g_fLightFov = 3.1415f/ 2.0f;D3DXMatrixPerspectiveFovLH( &g_mShadowProj, g_fLightFov, 1, 0.01f, 100.0f);

on rendering:

//get the view matrix of the light:D3DXMATRIXA16 mLightView;D3DXVECTOR3 vPos = Lights[0]->lt.Position;D3DXVECTOR3 vDir = Lights[0]->lt.Direction;mLightView._41 = mLightView._42 = mLightView._43 = 0.0f;D3DXVec3Normalize( &vDir, &vDir );vDir.x += vPos.x;  // vDir denotes the look-at pointvDir.y += vPos.y;vDir.z += vPos.z;D3DXVECTOR3 vUp( 1.0f, 0.0f, 0.0f ); /*assumption!*/D3DXMatrixLookAtLH( &mLightView, &vPos, &vDir, &vUp );// Render the shadow mapLPDIRECT3DSURFACE9 pOldRT = NULL;Game::g_pd3dDevice->GetRenderTarget( 0, &pOldRT );LPDIRECT3DSURFACE9 pShadowSurf;if( SUCCEEDED( g_pShadowMap->GetSurfaceLevel( 0, &pShadowSurf ) ) ){	Game::g_pd3dDevice->SetRenderTarget( 0, pShadowSurf );	SAFE_RELEASE( pShadowSurf );}LPDIRECT3DSURFACE9 pOldDS = NULL;if( SUCCEEDED( Game::g_pd3dDevice->GetDepthStencilSurface( &pOldDS ) ) )	Game::g_pd3dDevice->SetDepthStencilSurface( g_pDSShadow );{	RenderScene(true,&mLightView, &g_mShadowProj );}if( pOldDS ){	Game::g_pd3dDevice->SetDepthStencilSurface( pOldDS );	pOldDS->Release();}Game::g_pd3dDevice->SetRenderTarget( 0, pOldRT );SAFE_RELEASE( pOldRT );D3DXMATRIX *pmView = &Game::GameCam.FinalView;g_pEffect->SetTexture( "g_txShadow", g_pShadowMap );	// Compute the matrix to transform from view space to// light projection space.  This consists of// the inverse of view matrix * view matrix of light * light projection matrixD3DXMATRIXA16 mViewToLightProj;mViewToLightProj = *pmView;D3DXMatrixInverse( &mViewToLightProj, NULL, &mViewToLightProj );D3DXMatrixMultiply( &mViewToLightProj, &mViewToLightProj, &mLightView );D3DXMatrixMultiply( &mViewToLightProj, &mViewToLightProj, &g_mShadowProj );g_pEffect->SetMatrix( "g_mViewToLightProj", &mViewToLightProj );//same as D3DTS_PROJECTION set to device?D3DXMATRIXA16 matProj;D3DXMatrixPerspectiveRH(&matProj, 1, 1, 1.0f, 100000.0f);RenderScene(false, pmView, &matProj);g_pEffect->SetTexture( "g_txShadow", NULL );

the render scene function:

g_pEffect->SetMatrix( "g_mProj", pmProj );	D3DXVECTOR3 v = Lights[0]->lt.Position;    D3DXVECTOR4 v4;    D3DXVec3Transform( &v4, &v, pmView );    g_pEffect->SetVector( "g_vLightPos", &v4 );    *(D3DXVECTOR3*)&v4 = Lights[0]->lt.Direction;    v4.w = 0.0f;  // Set w 0 so that the translation part doesn't come to play    D3DXVec4Transform( &v4, &v4, pmView );  // Direction in view space    D3DXVec3Normalize( (D3DXVECTOR3*)&v4, (D3DXVECTOR3*)&v4 );   g_pEffect->SetVector( "g_vLightDir", &v4 );   bRenderShadow = false;   if( bRenderShadow )        g_pEffect->SetTechnique("RenderShadow");   else		g_pEffect->SetTechnique("RenderScene");   //render the objects:   for(int o =0; o < (int)mymap->staticObjects.size(); ++o)   {		Object * obj = mymap->staticObjects[o];		D3DXMATRIXA16 mWorldView = obj->matWorld;		D3DXMatrixMultiply( &mWorldView, &mWorldView, pmView );		g_pEffect->SetMatrix( "g_mWorldView", &mWorldView );		LPD3DXMESH pMesh = obj->g_pMesh;		UINT cPass;        g_pEffect->Begin( &cPass, 0 );		for( UINT p = 0; p < cPass; ++p )        {           g_pEffect->BeginPass( p );            for( DWORD i = 0; i < obj->g_dwNumMaterials; ++i )            {                D3DXVECTOR4 vDif( obj->g_pMeshMaterials.Diffuse.r,                                   obj->g_pMeshMaterials.Diffuse.g,                                    obj->g_pMeshMaterials.Diffuse.b,                                    obj->g_pMeshMaterials.Diffuse.a );               g_pEffect->SetVector( "g_vMaterial", &vDif );                if( obj->g_pMeshTextures )                    g_pEffect->SetTexture( "g_txScene", obj->g_pMeshTextures );                           g_pEffect->CommitChanges() ;                pMesh->DrawSubset( i ) ;            }            g_pEffect->EndPass();        }		g_pEffect->End();   }    Object * obj = plane;	D3DXMATRIXA16 mWorldView = obj->matWorld;	D3DXMatrixMultiply( &mWorldView, &mWorldView, pmView );	g_pEffect->SetMatrix( "g_mWorldView", &mWorldView );	LPD3DXMESH pMesh = obj->g_pMesh;	UINT cPass;    g_pEffect->Begin( &cPass, 0 );	for( UINT p = 0; p < cPass; ++p )    {        g_pEffect->BeginPass( p );        for( DWORD i = 0; i < obj->g_dwNumMaterials; ++i )        {            D3DXVECTOR4 vDif( obj->g_pMeshMaterials.Diffuse.r,                                obj->g_pMeshMaterials.Diffuse.g,                                obj->g_pMeshMaterials.Diffuse.b,                                obj->g_pMeshMaterials.Diffuse.a );            g_pEffect->SetVector( "g_vMaterial", &vDif );            if( obj->g_pMeshTextures )                g_pEffect->SetTexture( "g_txScene", obj->g_pMeshTextures );            g_pEffect->CommitChanges() ;            pMesh->DrawSubset( i ) ;        }        g_pEffect->EndPass();    }	g_pEffect->End();

please note that the dx clear and begin are called before the rendering process and end is called after it.

so as you can see, i followed the dx sample by word. and results were not very satisfactory, some more screen shots:

Applying shadow map to plane only:
plane

Applying it to road only:
road

Applying it to all the scene 1:
scene1

all the scene 2: (camera moved)
scene2

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