SetClipPlane ????

SetClipPlane ????

• s3ns

  There is an old directx sdk sample (dx8.1) called clipmirror, that draws a mirror with the clip planes technique.  Maybe you can download it somewhere.  Here is a code fragment from that sample:
  
  

  //-----------------------------------------------------------------------------

  // Name: RenderMirror()

  // Desc: Renders the scene as reflected in a mirror. The corners of the mirror

  // define a plane, which is used to build the reflection matrix. The

  // scene is rendered with the cull-mode reversed, since all normals in

  // the scene are likewise reflected.

  //-----------------------------------------------------------------------------

  HRESULT CMyD3DApplication::RenderMirror()

  {

  D3DXMATRIX matWorldSaved;

  D3DXMATRIX matReflectInMirror;

  D3DXPLANE plane;

  // Save the world matrix so it can be restored

  m_pd3dDevice->GetTransform( D3DTS_WORLD, &matWorldSaved );

  // Get the four corners of the mirror. (This should be dynamic rather than

  // hardcoded.)

  D3DXVECTOR3 a(-1.5f, 1.5f, 3.0f );

  D3DXVECTOR3 b( 1.5f, 1.5f, 3.0f );

  D3DXVECTOR3 c( -1.5f,-1.5f, 3.0f );

  D3DXVECTOR3 d( 1.5f,-1.5f, 3.0f );

  // Construct the reflection matrix

  D3DXPlaneFromPoints( &plane, &a, &b, &c );

  D3DXMatrixReflect( &matReflectInMirror, &plane );

  m_pd3dDevice->SetTransform( D3DTS_WORLD, &matReflectInMirror );

  // Reverse the cull mode (since normals will be reflected)

  m_pd3dDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_CW );

  // Set the custom clip planes (so geometry is clipped by mirror edges).

  // This is the heart of this sample. The mirror has 4 edges, so there are

  // 4 clip planes, each defined by two mirror vertices and the eye point.

  m_pd3dDevice->SetClipPlane( 0, *D3DXPlaneFromPoints( &plane, &b, &a, &m_vEyePt ) );

  m_pd3dDevice->SetClipPlane( 1, *D3DXPlaneFromPoints( &plane, &d, &b, &m_vEyePt ) );

  m_pd3dDevice->SetClipPlane( 2, *D3DXPlaneFromPoints( &plane, &c, &d, &m_vEyePt ) );

  m_pd3dDevice->SetClipPlane( 3, *D3DXPlaneFromPoints( &plane, &a, &c, &m_vEyePt ) );

  m_pd3dDevice->SetRenderState( D3DRS_CLIPPLANEENABLE,

  D3DCLIPPLANE0 | D3DCLIPPLANE1 | D3DCLIPPLANE2 | D3DCLIPPLANE3 );

  // Render the reflected scene.  For the "normal" scene, RenderScene() was prior called from another function with default render states.

  RenderScene();

  // Restore the modified render states

  m_pd3dDevice->SetTransform( D3DTS_WORLD, &matWorldSaved );

  m_pd3dDevice->SetRenderState( D3DRS_CLIPPLANEENABLE, 0x00 );

  m_pd3dDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_CCW );

  // Finally, render the mirror itself (as an alpha-blended quad)

  m_pd3dDevice->SetRenderState( D3DRS_ALPHABLENDENABLE, TRUE );

  m_pd3dDevice->SetRenderState( D3DRS_SRCBLEND, D3DBLEND_SRCALPHA );

  m_pd3dDevice->SetRenderState( D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA );

  m_pd3dDevice->SetStreamSource( 0, m_pMirrorVB, sizeof(MIRRORVERTEX) );

  m_pd3dDevice->SetVertexShader( D3DFVF_MIRRORVERTEX );

  m_pd3dDevice->DrawPrimitive( D3DPT_TRIANGLESTRIP, 0, 2 );

  m_pd3dDevice->SetRenderState( D3DRS_ALPHABLENDENABLE, FALSE );

  return S_OK;

  }
  

  
  

• Che2Palle

  I am not reflecting the world, i just create a new virtual camera.
  
  
  
  

• DJCrowell

  Its not using clip planes but there is an example using stencil buffers here. Hope it helps you get where you want.
  
  http://www.pieterg.com/Tutorials/tutorial10.php
  
  
  
• SetClipPlane ????