关于多个镜面蒙板的问题

pandahur 2012-04-08 06:27:49

一个场景里有4个镜面，先将其一起Draw To Stencil Buffer, 然后在渲染每个面的时候如何防止因先后顺序造成的图像重叠覆盖呢？



pd3dDevice->SetRenderState(D3DRS_STENCILENABLE,        TRUE);

         pd3dDevice->SetRenderState(D3DRS_STENCILFUNC, D3DCMP_ALWAYS);

         pd3dDevice->SetRenderState(D3DRS_STENCILREF, 0x1);

         pd3dDevice->SetRenderState(D3DRS_STENCILMASK, 0xffffffff);

         pd3dDevice->SetRenderState(D3DRS_STENCILWRITEMASK, 0xffffffff);

         pd3dDevice->SetRenderState(D3DRS_STENCILZFAIL,         D3DSTENCILOP_KEEP);

         pd3dDevice->SetRenderState(D3DRS_STENCILFAIL, D3DSTENCILOP_KEEP);

         pd3dDevice->SetRenderState(D3DRS_STENCILPASS, D3DSTENCILOP_REPLACE);

 

        pd3dDevice->SetRenderState(D3DRS_ZWRITEENABLE,                FALSE);

         pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE,        TRUE);

         pd3dDevice->SetRenderState(D3DRS_SRCBLEND,                        D3DBLEND_ZERO);

         pd3dDevice->SetRenderState(D3DRS_DESTBLEND,                        D3DBLEND_ONE);

         

        vector<CObject3D*> vecMirror;

         for(vector<CObject3D*>::iterator it=m_listOpaque.begin();it!=m_listOpaque.end();it++)

         {

                 if((*it)->m_bIsMirror)

                 {        

                        D3DXVECTOR3 vNormal((*it)->m_plane.a,(*it)->m_plane.b,(*it)->m_plane.c);

                         D3DXVECTOR3 vEye = *g_pX3DControl->m_Camera.GetEyePt()-(*it)->m_planeCenter;

                         

                        FLOAT fRes = D3DXVec3Dot(&vNormal, &vEye);

                         if(fRes>=0.0f)

                                 continue;

                         vecMirror.push_back(*it);

                         (*it)->RenderOneStage(pd3dDevice, m_pAmbientStage, fTime, fElapsedTime);

                 }

         }

 

        pd3dDevice->SetRenderState(D3DRS_ZWRITEENABLE, TRUE);

         pd3dDevice->SetRenderState(D3DRS_STENCILFUNC, D3DCMP_EQUAL);

         pd3dDevice->SetRenderState(D3DRS_STENCILPASS, D3DSTENCILOP_KEEP);

 

        m_bMirrorFlag = true;

         for(vector<CObject3D*>::iterator it=vecMirror.begin();it!=vecMirror.end();it++)

         {

                 V(pd3dDevice->Clear(0, NULL, D3DCLEAR_ZBUFFER, 0, 1.0f, 0L));

                 pd3dDevice->SetRenderState(D3DRS_SRCBLEND,  D3DBLEND_DESTCOLOR);

                 pd3dDevice->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_ZERO);

                 

                D3DXMatrixReflect(&m_MatReflect, &(*it)->m_plane);

                 StagesPerLight(pd3dDevice,fTime,fElapsedTime,NULL,(*it));

         }

         m_bMirrorFlag = false;

 

        pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, FALSE);

         pd3dDevice->SetRenderState(D3DRS_STENCILENABLE,         FALSE);