Bug fixed in the ray/box intersection computation function.

GLViewer/Box.h

@@ -658,30 +658,32 @@ inline bool Box3f::Intersects( const QVector3D& rayOrigin,
         intersectionDist = std::numeric_limits<float>::max();
 
         for( int i=0; i<3; ++i )
-        {
-            float frontFacingPlane = (rayDirection[i] > 0.0f)?  m_Max[i]  :  m_Min[i];
-            float t = (frontFacingPlane - rayOrigin[i]) / rayDirection[i];
-            if( t < intersectionDist )
+            if( rayDirection[i] != 0.0f )
             {
-                intersectionDist = t;
-                intersectionPlaneId = i;
+                float frontFacingPlane = (rayDirection[i] > 0.0f)?  m_Max[i]  :  m_Min[i];
+                float t = (frontFacingPlane - rayOrigin[i]) / rayDirection[i];
+                if( t < intersectionDist )
+                {
+                    intersectionDist = t;
+                    intersectionPlaneId = i;
+                }
             }
-        }
     }
     else
     {
         intersectionDist = 0.0f;
 
         for( int i=0; i<3; ++i )
-        {
-            float frontFacingPlane = (rayDirection[i] > 0.0f)?  m_Min[i]  :  m_Max[i];
-            float t = (frontFacingPlane - rayOrigin[i]) / rayDirection[i];
-            if( t > intersectionDist )
+            if( rayDirection[i] != 0.0f )
             {
-                intersectionDist = t;
-                intersectionPlaneId = i;
+                float frontFacingPlane = (rayDirection[i] > 0.0f)?  m_Min[i]  :  m_Max[i];
+                float t = (frontFacingPlane - rayOrigin[i]) / rayDirection[i];
+                if( t > intersectionDist )
+                {
+                    intersectionDist = t;
+                    intersectionPlaneId = i;
+                }
             }
-        }
     }
 
     if( intersectionPlaneId < 0 )