[Aqsis-commits] SF.net SVN: aqsis: [1832] branches/texfiltering/aqsis/texturing/texlib/ ewafilter.cpp

[<c4...@us...>]

Revision: 1832
          http://aqsis.svn.sourceforge.net/aqsis/?rev=1832&view=rev
Author:   c42f
Date:     2007-12-27 21:22:31 -0800 (Thu, 27 Dec 2007)

Log Message:
-----------
* Fix bug in filter truncation algorithm - the transpose was in the wrong
  position.  Also increase the prefilter variance a bit to reduce aliasing.

Modified Paths:
--------------
    branches/texfiltering/aqsis/texturing/texlib/ewafilter.cpp

Modified: branches/texfiltering/aqsis/texturing/texlib/ewafilter.cpp
===================================================================
--- branches/texfiltering/aqsis/texturing/texlib/ewafilter.cpp	2007-12-28 05:19:42 UTC (rev 1831)
+++ branches/texfiltering/aqsis/texturing/texlib/ewafilter.cpp	2007-12-28 05:22:31 UTC (rev 1832)
@@ -71,13 +71,13 @@
 	// check one inequality here.
 	if(maxAspectRatio*maxAspectRatio*eig2 < eig1)
 	{
-		Aqsis::log() << "aspect ratio = " << eig2/eig1 << "\n";
+		//Aqsis::log() << "aspect ratio = " << eig2/eig1 << "\n";
 		// Need to perform eccentricity clamping
 		SqMatrix2D R = covariance.orthogDiagonalize(eig1, eig2);
 		// By construction, covariance = R^T * D * R, where D = SqMatrix2D(eig1, eig2);
 		// here we modify the diagonal matrix D to replace eig2 with something larger.
-		covariance = R.transpose() * SqMatrix2D(eig1,
-				eig1/(maxAspectRatio*maxAspectRatio)) * R;
+		covariance = R * SqMatrix2D(eig1,
+				eig1/(maxAspectRatio*maxAspectRatio)) * R.transpose();
 	}
 }
 
@@ -104,7 +104,7 @@
 	const TqFloat reconsVar = 1.3/(2*M_PI);
 	// "Prefilter" variance - this is the variance of the antialiasing filter
 	// which is used immediately before resampling onto the discrete grid.
-	const TqFloat prefilterVar = 1.3/(2*M_PI);
+	const TqFloat prefilterVar = 2.0/(2*M_PI);
 	// Construct the covariance matrix, coVar.
 	//
 	// Note: This looks slightly different from Heckbert's thesis, since


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