Parallel-Split Shadow Maps for many xfiles

akira32

I saw the paper of Parallel-Split Shadow Maps for Large-scale Virtual Environments. I think this theory can use in my game (with large-scale scene). And I try to implement the theory to my mapeditor. But I encounter a problem. There is a black block when I close to the object(grandstand) in fore. In the PSSM sample code, there is only a xfile called city.x. But my scene have many objects and those have many instances. If I merge all objects in my scene into a big xfile, this problem of black block will not disppear.Could sombody tell how to resolve this problem?

1. 
   
2. void CPSSM::RenderScene(D3DXMATRIX &mView, D3DXMATRIX &mProj)
   
3. {
   
4.         // Set constants
   
5.         //
   
6.         D3DXMATRIX mViewProj=mView * mProj;
   
7.        
   
8.         _pEffect->SetVector("g_vLightDir",&_vLightDir);
   
9.         _pEffect->SetVector("g_vLightColor",&_vLightDiffuse);
   
10.         _pEffect->SetVector("g_vAmbient",&_vLightAmbient);
    
11.         _pEffect->SetFloat("g_fShadowMapSize",(FLOAT)_iShadowMapSize);
    
12. 
    
13.         // enable effect
    
14.         unsigned int iPasses=0;
    
15.         _pEffect->Begin(&iPasses,0);
    
16. 
    
17.         // for each pass in effect
    
18.         for(unsigned int i=0;i<iPasses;i++)
    
19.         {
    
20. 
    
21.                 // start pass
    
22.                 _pEffect->BeginPass(i);
    
23.                 {
    
24. 
    
25.                         std::list<HRObject>::iterator p_object;
    
26. 
    
27.                         for (p_object=m_p_object_list->begin();p_object!=m_p_object_list->end();++p_object)
    
28.                         {
    
29.                                 int nModelID=p_object->GetModelID();
    
30.                                 HRMeshAdv* pMesh=(HRMeshAdv*)(*m_p_model_list)[nModelID];
    
31. 
    
32.                                 D3DXMATRIX mWorld;
    
33.                                 mWorld=CalculateWorldMatrixFromObject(&(*p_object));
    
34. 
    
35.                                 _pEffect->SetMatrix("g_mViewProj",&(mWorld*mViewProj));
    
36.                                 _pEffect->CommitChanges();
    
37. 
    
38.                                 pMesh->RenderPSSM(m_pD3DDevice);
    
39.                         }
    
40. 
    
41.                         // for each subset in mesh
    
42.                         //for(DWORD j=0;j<_iMeshMaterials;j++)
    
43.                         //{
    
44.                         //        // draw subset
    
45.                         //        _pMesh->DrawSubset(j);
    
46.                         //}
    
47. 
    
48.                 }
    
49.                 // end pass
    
50.                 _pEffect->EndPass();
    
51. 
    
52.         }
    
53.         // disable effect
    
54.         _pEffect->End();
    
55. }
    

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pssm_near_error.jpg is the picture with error when camera closes to the object(grandstand). The error is the big black block.

pssm_normal.jpg is the picture when camera leaves the object(grandstand).