--- ../../backup/VTK/VolumeRendering/vtkFixedPointVolumeRayCastMapper.cxx	2006-12-02 11:10:35.000000000 -0600
+++ vtkFixedPointVolumeRayCastMapper.cxx	2007-08-16 09:51:07.070980624 -0500
@@ -1979,7 +1979,7 @@ float vtkFixedPointVolumeRayCastMapper::
                                     ((rayDirection[0]<0)?(-rayDirection[0]):(rayDirection[0])) );
       }
     
-    if ( diff[1] >= diff[0] && diff[1] >= diff[2] && rayDirection[2])
+    if ( diff[1] >= diff[0] && diff[1] >= diff[2] && rayDirection[1])
       {
       steps = 1 + static_cast<int>( diff[1] /
                                     ((rayDirection[1]<0)?(-rayDirection[1]):(rayDirection[1])) );
@@ -2043,12 +2043,31 @@ float vtkFixedPointVolumeRayCastMapper::
             }
           }
         
-        if ( !stepsValid || currSteps < *numSteps )
+        if ( !stepsValid || currSteps > *numSteps )
           {
           *numSteps = currSteps;
           stepsValid = 1;
           }
         }
+      for ( stepLoop = 0; stepLoop < 3; stepLoop++ )
+        {
+        unsigned int endVal = this->ToFixedPointPosition(rayEnd[stepLoop]);
+        if (dir[stepLoop]&0x80000000) 
+          {
+          if (endVal >= pos[stepLoop]) 
+            {
+            dir[stepLoop] =  (endVal - pos[stepLoop]) / *numSteps;
+            dir[stepLoop] = dir[stepLoop] | 0x80000000;
+            }
+          } 
+          else 
+          {
+            if (endVal <= pos[stepLoop]) 
+              {
+              dir[stepLoop] =  (pos[stepLoop] - endVal) / *numSteps;
+              }
+          }
+        }
       }
     }
 }