Improved the handling of matrices in serialization so that it's more reliable,

change was to use doubles for reading and writing matrices regardless of type of Matrix
being serialized.

Change does break backwards compatibility though, so code
path supporting original format has been left in for the
time being.  However, this code is not reliable enough and
is over complicated compared to the simplified handling.   Once
the new code has been bedded down for a while I'll remove this code block.

src/osgDB/InputStream.cpp

@@ -24,7 +24,7 @@ using namespace osgDB;
 static std::string s_lastSchema;
 
 InputStream::InputStream( const osgDB::Options* options )
-    :   _byteSwap(0), _useFloatMatrix(true), _useSchemaData(false), _forceReadingImage(false), _dataDecompress(0)
+    :   _byteSwap(0), _useSchemaData(false), _forceReadingImage(false), _dataDecompress(0)
 {
     if ( !options ) return;
     _options = options;
@@ -141,27 +141,104 @@ InputStream& InputStream::operator>>( osg::Plane& p )
     p.set( p0, p1, p2, p3 ); return *this;
 }
 
+#if 0
 InputStream& InputStream::operator>>( osg::Matrixf& mat )
 {
-    *this >> PROPERTY("Matrixf") >> BEGIN_BRACKET;
+   ObjectProperty property("");
+   *this >> property  >> BEGIN_BRACKET;
+
+   if (property._name == "Matrixf")
+   {
+        // stream has same type as what we want to read so read directly
+        for ( int r=0; r<4; ++r )
+        {
+            *this >> mat(r, 0) >> mat(r, 1) >> mat(r, 2) >> mat(r, 3);
+        }
+   }
+   else if (property._name == "Matrixd")
+   {
+        // stream has different type than what we want to read so read stream into
+        // a temporary and then copy across to the final matrix
+        double value;
+        for ( int r=0; r<4; ++r )
+        {
+            for ( int c=0; c<4; ++c)
+            {
+                *this >> value;
+                mat(r,c) = static_cast<float>(value);
+            }
+        }
+   }
+
+   *this >> END_BRACKET;
+   return *this;
+}
+
+InputStream& InputStream::operator>>( osg::Matrixd& mat )
+{
+   ObjectProperty property("");
+   *this >> property  >> BEGIN_BRACKET;
+
+   if (property._name == "Matrixf")
+   {
+        // stream has different type than what we want to read so read stream into
+        // a temporary and then copy across to the final matrix
+        float value;
+        for ( int r=0; r<4; ++r )
+        {
+            for ( int c=0; c<4; ++c)
+            {
+                *this >> value;
+                mat(r,c) = static_cast<float>(value);
+            }
+        }
+   }
+   else if (property._name == "Matrixd")
+   {
+        // stream has same type as what we want to read so read directly
+        for ( int r=0; r<4; ++r )
+        {
+            *this >> mat(r, 0) >> mat(r, 1) >> mat(r, 2) >> mat(r, 3);
+        }
+   }
+
+   *this >> END_BRACKET;
+   return *this;
+}
+#else
+InputStream& InputStream::operator>>( osg::Matrixf& mat )
+{
+    *this >> BEGIN_BRACKET;
+
+    // stream has different type than what we want to read so read stream into
+    // a temporary and then copy across to the final matrix
+    double value;
     for ( int r=0; r<4; ++r )
     {
-        *this >> mat(r, 0) >> mat(r, 1) >> mat(r, 2) >> mat(r, 3);
+        for ( int c=0; c<4; ++c)
+        {
+            *this >> value;
+            mat(r,c) = static_cast<float>(value);
+        }
     }
+
     *this >> END_BRACKET;
     return *this;
 }
 
 InputStream& InputStream::operator>>( osg::Matrixd& mat )
 {
-    *this >> PROPERTY("Matrixd") >> BEGIN_BRACKET;
+    *this >> BEGIN_BRACKET;
+
     for ( int r=0; r<4; ++r )
     {
         *this >> mat(r, 0) >> mat(r, 1) >> mat(r, 2) >> mat(r, 3);
     }
+
     *this >> END_BRACKET;
     return *this;
 }
+#endif
 
 osg::Array* InputStream::readArray()
 {
@@ -642,7 +719,6 @@ InputStream::ReadType InputStream::start( InputIterator* inIterator )
         type = static_cast<ReadType>(typeValue);
         
         unsigned int attributes; *this >> attributes;
-        if ( attributes&0x1 ) _useFloatMatrix = false;
         if ( attributes&0x2 ) _useSchemaData = true;
     }
     if ( !isBinary() )