Index: /trunk/doc/pslib/ChangeLogSDRS.tex
===================================================================
--- /trunk/doc/pslib/ChangeLogSDRS.tex	(revision 3092)
+++ /trunk/doc/pslib/ChangeLogSDRS.tex	(revision 3093)
@@ -1,3 +1,3 @@
-%%% $Id: ChangeLogSDRS.tex,v 1.60 2005-01-24 22:05:01 price Exp $
+%%% $Id: ChangeLogSDRS.tex,v 1.61 2005-01-26 00:04:52 price Exp $
 
 \subsection{Changes from version 00 to version 01}
@@ -444,3 +444,5 @@
 \item Removed in \code{psListAlloc}, ``The number of iterators in the
   list is initially set to zero.'' (bug 271).
-\end{itemize}
+\item Added \code{region} and \code{nSamples} to
+  \code{psPlaneTransformCombine} and specified the algorithm.
+\end{itemize}
Index: /trunk/doc/pslib/psLibSDRS.tex
===================================================================
--- /trunk/doc/pslib/psLibSDRS.tex	(revision 3092)
+++ /trunk/doc/pslib/psLibSDRS.tex	(revision 3093)
@@ -1,3 +1,3 @@
-%%% $Id: psLibSDRS.tex,v 1.171 2005-01-24 22:05:06 price Exp $
+%%% $Id: psLibSDRS.tex,v 1.172 2005-01-26 00:04:59 price Exp $
 \documentclass[panstarrs,spec]{panstarrs}
 
@@ -4769,5 +4769,5 @@
 \begin{verbatim}
 psPlaneTransform *psPlaneTransformInvert(psPlaneTransform *out, const psPlaneTransform *in, psRegion *region, int nSamples);
-psPlaneTransform *psPlaneTransformCombine(psPlaneTransform *out, const psPlaneTransform *trans1, const psPlaneTransform *trans2);
+psPlaneTransform *psPlaneTransformCombine(psPlaneTransform *out, const psPlaneTransform *trans1, const psPlaneTransform *trans2, psRegion *region, int nSamples);
 bool psPlaneTranformFit(psPlaneTransform *trans, const psArray *source, const psArray *dest, int nRejIter, float sigmaClip);
 \end{verbatim}
@@ -4790,7 +4790,10 @@
 (\code{trans1} and \code{trans2}) and returns a single transformation
 that has the effect of performing \code{trans1} followed by
-\code{trans2}.  The function shall return \code{NULL} if it was unable
-to generate the transformation; otherwise it shall return the
-transformation.
+\code{trans2}.  In the event that the input transformation is linear,
+an exact solution may be calculated; otherwise \code{nSamples} samples
+in each axis, covering the region specified by \code{region} shall be
+used as a grid to fit the best inverse transformation.  The function
+shall return \code{NULL} if it was unable to generate the
+transformation; otherwise it shall return the transformation.
 
 \code{psPlaneTransformFit} takes two arrays containing matched