DirectX - Stencil buffer mirrors
Author
I am trying to use the stencil buffer to create a mirror. Everything seems to be showing up on the mirror, but my program draws all pixels for all objects even ones that should be blocked by other objects. So the end result is that objects seems semi-transparent because objects that are behind them are showing up in the reflection.
Bit hard to tell exactly what's going on... can you post a screenshot?
Is the Z-Buffer enabled when rendering the mirrored geometry?
Is the Z-Buffer enabled when rendering the mirrored geometry?
If you are reversing your vertex winding and mirroring the vertices around the mirror plane in the vertex shader, then you should get the proper visibility information from your z-buffer. Do you still have the z-buffer writes enabled when you are rendering to the mirror surface?
Author
I knew I forgot to add something to my question. Here is my code for creating the mirror.
[Edited by - Omnimagus on July 21, 2009 10:48:17 AM]
void RenderMirror(LPDIRECT3DDEVICE9 pDevice, D3D_OBJECT* pMirror, vector<D3D_OBJECT*> pObjectsToReflect){ pDevice->SetRenderState(D3DRS_STENCILENABLE, true); pDevice->SetRenderState(D3DRS_STENCILFUNC, D3DCMP_ALWAYS); pDevice->SetRenderState(D3DRS_STENCILREF, 0x1); pDevice->SetRenderState(D3DRS_STENCILMASK, 0xffffffff); pDevice->SetRenderState(D3DRS_STENCILWRITEMASK, 0xffffffff); pDevice->SetRenderState(D3DRS_STENCILZFAIL, D3DSTENCILOP_KEEP); pDevice->SetRenderState(D3DRS_STENCILFAIL, D3DSTENCILOP_KEEP); pDevice->SetRenderState(D3DRS_STENCILPASS, D3DSTENCILOP_REPLACE); pDevice->SetRenderState(D3DRS_ZWRITEENABLE, true); pDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, true); pDevice->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_ZERO); pDevice->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_ONE); pDevice->SetStreamSource(0, pMirror->tVertexIndex, 0, sizeof(CUSTOMVERTEX)); pDevice->SetIndices(pMirror->tIndicesIndex); pDevice->SetFVF(CUSTOMFVF); pDevice->SetMaterial(&pMirror->pMaterial); pDevice->SetTexture(0, pMirror->tTextureIndex); D3DXMATRIX matTransforms; D3DXMatrixIdentity(&matTransforms); D3DXMatrixTranslation(&matTransforms, pMirror->tPosition.x, pMirror->tPosition.y, pMirror->tPosition.z); D3DXMATRIX matScale; D3DXMatrixScaling(&matScale, pMirror->tScale.x,pMirror->tScale.x, pMirror->tScale.x); D3DXMATRIX matRotateX, matRotateY, matRotateZ; D3DXMatrixRotationX(&matRotateX, pMirror->tRotations.x); D3DXMatrixRotationY(&matRotateY, pMirror->tRotations.y); D3DXMatrixRotationZ(&matRotateZ, pMirror->tRotations.z); matTransforms = matTransforms * matRotateX * matRotateY * matRotateZ * matScale; pDevice->SetTransform(D3DTS_WORLD, &matTransforms); pDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, pMirror->nNumVertices, 0, pMirror->nNumIndices / 3); pDevice->SetRenderState( D3DRS_ZWRITEENABLE, true ); pDevice->SetRenderState(D3DRS_STENCILFUNC, D3DCMP_EQUAL); pDevice->SetRenderState(D3DRS_STENCILPASS, D3DSTENCILOP_KEEP); for(int i = 0; i < pObjectsToReflect.size(); i++) { D3DXMATRIX matTransforms, matReflect; D3DXPLANE plane(0.0f, 0.0f, 1.0f, 0.0f); // xy plane D3DXMatrixReflect(&matReflect, &plane); D3DXMatrixTranslation(&matTransforms, pObjectsToReflect->tPosition.x, pObjectsToReflect->tPosition.y, pObjectsToReflect->tPosition.z); D3DXMATRIX matScale; D3DXMatrixScaling(&matScale, pObjectsToReflect->tScale.x, pObjectsToReflect->tScale.x, pObjectsToReflect->tScale.x); D3DXMATRIX matRotateX, matRotateY, matRotateZ; D3DXMatrixRotationX(&matRotateX, pObjectsToReflect->tRotations.x); D3DXMatrixRotationY(&matRotateY, pObjectsToReflect->tRotations.y); D3DXMatrixRotationZ(&matRotateZ, pObjectsToReflect->tRotations.z); matTransforms = (matTransforms * matRotateX * matRotateY * matRotateZ * matScale) * matReflect; pDevice->Clear(0, 0, D3DCLEAR_ZBUFFER, 0, 1.0f, 0); pDevice->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_DESTCOLOR); pDevice->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_ZERO); pDevice->SetStreamSource(0, pObjectsToReflect->tVertexIndex, 0, sizeof(CUSTOMVERTEX)); pDevice->SetIndices(pObjectsToReflect->tIndicesIndex); pDevice->SetTransform(D3DTS_WORLD, &matTransforms); pDevice->SetMaterial(&pObjectsToReflect->pMaterial); pDevice->SetTexture(0, pObjectsToReflect->tTextureIndex); pDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_CW); pDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, pObjectsToReflect->nNumVertices, 0, pObjectsToReflect->nNumIndices / 3); pDevice->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_ZERO); pDevice->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_ONE); } pDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, false); pDevice->SetRenderState( D3DRS_STENCILENABLE, false); pDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_CCW);}[Edited by - Omnimagus on July 21, 2009 10:48:17 AM]
Why you clear z buffer every time in loop "for(int i = 0; i < pObjectsToReflect.size(); i++)"? It seems all the object will pass z test.
This topic is closed to new replies.
Advertisement
Popular Topics
Advertisement
