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mickeyren

parallel split shadow map demo jitters

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Hi I'm just now implementing the PSSM demo tutorial found here: http://hax.fi/asko/PSSM.html in my scene. I was wondering if you guys notice that the last shadow map split jitters when you rotate your camera? Its not always the last shadow map, sometimes the 2nd/3rd to the last gets affected as well. It probably happens in the CalculateLightForFrustum() function, perhaps when the zooming is applied to the projection matrix:
  // Next we build a special matrix for cropping the lights view
  // to only contain points of the current frustum split
  //
  
  float fScaleX=2.0f/(fMaxX-fMinX);
  float fScaleY=2.0f/(fMaxY-fMinY);

  float fOffsetX=-0.5f*(fMaxX+fMinX)*fScaleX;
  float fOffsetY=-0.5f*(fMaxY+fMinY)*fScaleY;

  D3DXMATRIX mCropView(  fScaleX,     0.0f,  0.0f,   0.0f,
                            0.0f,  fScaleY,  0.0f,   0.0f,
                            0.0f,     0.0f,  1.0f,   0.0f,
                        fOffsetX, fOffsetY,  0.0f,   1.0f );

  // multiply the projection matrix with it
  _mLightProj*=mCropView;

  // finally modify projection matrix for linearized depth
  _mLightProj._33/=_fLightFar;
  _mLightProj._43/=_fLightFar;

Has anyone applied a fix to this? It has an adverse side effect to the whole scene. Advance thanks.

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