World|Map Renderer|Polyobj: Skip half-edges on the back of one-sided …

…polyobj lines When clipping lumobjs by sight and notifying geometry changes.
skyjake · Aug 14, 2013 · 72c40f0 · 72c40f0
1 parent 230d63d
commit 72c40f0
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diff --git a/doomsday/client/src/render/lumobj.cpp b/doomsday/client/src/render/lumobj.cpp
@@ -1168,6 +1168,10 @@ boolean LOIT_ClipLumObjBySight(void *data, void *context)
         foreach(Polyobj *po, bspLeaf->polyobjs())
         foreach(HEdge *hedge, po->mesh().hedges())
         {
+            // Is this on the back of a one-sided line?
+            if(!hedge->mapElement())
+                continue;
+
             // Ignore half-edges facing the wrong way.
             if(hedge->mapElement()->as<Line::Side::Segment>()->isFrontFacing())
             {

diff --git a/doomsday/client/src/world/polyobj.cpp b/doomsday/client/src/world/polyobj.cpp
@@ -53,6 +53,10 @@ static void notifyGeometryChanged(Polyobj &po)
         // Shadow bias must be informed when surfaces move/deform.
         foreach(HEdge *hedge, po.mesh().hedges())
         {
+            // Is this on the back of a one-sided line?
+            if(!hedge->mapElement())
+                continue;
+
             hedge->mapElement()->as<Line::Side::Segment>()->
                     updateBiasAfterGeometryMove(Line::Side::Middle);
         }