crashtesting: ooo72999-1.ods NaNs found in light direction

and NaN != NaN so busted logic propogates, drop invalid directions
on initial read

Change-Id: Ic76c714666df14d37a4c68f43b817327675bd0e0

svx/source/items/e3ditem.cxx

@@ -95,6 +95,8 @@ SvStream& SvxB3DVectorItem::Store(SvStream &rStream, sal_uInt16 /*nItemVersion*/
 
 bool SvxB3DVectorItem::QueryValue( uno::Any& rVal, sal_uInt8 /*nMemberId*/ ) const
 {
+    assert(!isnan(aVal.getX()) && !isnan(aVal.getY()) && !isnan(aVal.getZ()));
+
     drawing::Direction3D aDirection;
 
     // Werte eintragen
@@ -117,6 +119,9 @@ bool SvxB3DVectorItem::PutValue( const uno::Any& rVal, sal_uInt8 /*nMemberId*/ )
     aVal.setX(aDirection.DirectionX);
     aVal.setY(aDirection.DirectionY);
     aVal.setZ(aDirection.DirectionZ);
+
+    assert(!isnan(aVal.getX()) && !isnan(aVal.getY()) && !isnan(aVal.getZ()));
+
     return true;
 }
 

xmloff/source/draw/ximp3dscene.cxx

@@ -64,7 +64,16 @@ SdXML3DLightContext::SdXML3DLightContext(
             }
             case XML_TOK_3DLIGHT_DIRECTION:
             {
-                SvXMLUnitConverter::convertB3DVector(maDirection, sValue);
+                ::basegfx::B3DVector aVal;
+                SvXMLUnitConverter::convertB3DVector(aVal, sValue);
+                if (!isnan(aVal.getX()) && !isnan(aVal.getY()) && !isnan(aVal.getZ()))
+                {
+                    maDirection = aVal;
+                }
+                else
+                {
+                    SAL_WARN("xmloff", "NaNs found in light direction: " << sValue);
+                }
                 break;
             }
             case XML_TOK_3DLIGHT_ENABLED: