Preload terrain in single pass

Otherwise there is lodFlags mismatch because some of the neighbours are removed
during preloading. This makes rendering culling create land chunk nodes again
for the same position, lod because lodFlags are different.

components/terrain/quadtreeworld.cpp

@@ -544,37 +544,16 @@ namespace Terrain
         vd->setViewPoint(viewPoint);
         vd->setActiveGrid(grid);
 
-        for (unsigned int pass = 0; pass < 3; ++pass)
-        {
-            unsigned int startEntry = vd->getNumEntries();
-
-            float distanceModifier = 0.f;
-            if (pass == 1)
-                distanceModifier = 1024;
-            else if (pass == 2)
-                distanceModifier = -1024;
-            DefaultLodCallback lodCallback(mLodFactor, mMinSize, mViewDistance, grid, cellWorldSize, distanceModifier);
-            mRootNode->traverseNodes(vd, viewPoint, &lodCallback);
-
-            if (pass == 0)
-            {
-                std::size_t progressTotal = 0;
-                for (unsigned int i = 0, n = vd->getNumEntries(); i < n; ++i)
-                    progressTotal += vd->getEntry(i).mNode->getSize();
-
-                reporter.addTotal(progressTotal);
-            }
+        DefaultLodCallback lodCallback(mLodFactor, mMinSize, mViewDistance, grid, cellWorldSize);
+        mRootNode->traverseNodes(vd, viewPoint, &lodCallback);
 
-            for (unsigned int i = startEntry; i < vd->getNumEntries() && !abort; ++i)
-            {
-                ViewDataEntry& entry = vd->getEntry(i);
+        reporter.addTotal(vd->getNumEntries());
 
-                loadRenderingNode(entry, vd, cellWorldSize, grid, true);
-                if (pass == 0)
-                    reporter.addProgress(entry.mNode->getSize());
-                vd->removeNodeFromIndex(entry.mNode);
-                entry.mNode = nullptr; // Clear node lest we break the neighbours search for the next pass
-            }
+        for (unsigned int i = 0, n = vd->getNumEntries(); i < n && !abort; ++i)
+        {
+            ViewDataEntry& entry = vd->getEntry(i);
+            loadRenderingNode(entry, vd, cellWorldSize, grid, true);
+            reporter.addProgress(1);
         }
     }