WS30: Terrasync compatible files, LoD control

Change WS30 file format to match standard scenery directory
structure, add controls for LOD ranges.

simgear/bucket/newbucket.cxx

@@ -192,39 +192,40 @@ std::string SGBucket::gen_vpb_base() const {
 
     top_lon = lon / 10;
     main_lon = lon;
-    if ((lon < 0) && (top_lon * 10 != lon)) {
+    if ( (lon < 0) && (top_lon * 10 != lon) ) {
-        top_lon -= 1;
+	top_lon -= 1;
     }
     top_lon *= 10;
-    if (top_lon >= 0) {
+    if ( top_lon >= 0 ) {
-        hem = 'E';
+	hem = 'e';
+    } else {
+	hem = 'w';
+	top_lon *= -1;
     }
-    else {
+    if ( main_lon < 0 ) {
-        hem = 'W';
+	main_lon *= -1;
-        top_lon *= -1;
-    }
-    if (main_lon < 0) {
-        main_lon *= -1;
     }
     
     top_lat = lat / 10;
     main_lat = lat;
-    if ((lat < 0) && (top_lat * 10 != lat)) {
+    if ( (lat < 0) && (top_lat * 10 != lat) ) {
-        top_lat -= 1;
+	top_lat -= 1;
     }
     top_lat *= 10;
-    if (top_lat >= 0) {
+    if ( top_lat >= 0 ) {
-        pole = 'N';
+	pole = 'n';
+    } else {
+	pole = 's';
+	top_lat *= -1;
     }
-    else {
+    if ( main_lat < 0 ) {
-        pole = 'S';
+	main_lat *= -1;
-        top_lat *= -1;
-    }
-    if (main_lat < 0) {
-        main_lat *= -1;
     }
 
-    ::snprintf(raw_path, 256, "WS_%c%d%c%2d", hem, main_lon, pole, main_lat);
+    ::snprintf(raw_path, 256, "%c%03d%c%02d/%c%03d%c%02d/ws_%c%03d%c%02d",
+	    hem, top_lon, pole, top_lat, 
+	    hem, main_lon, pole, main_lat,
+        hem, main_lon, pole, main_lat);
 
     return raw_path;
 }

simgear/scene/model/ModelRegistry.cxx

@@ -937,6 +937,40 @@ public:
     }
 };
 
+class AdjustLODVisitor : public osg::NodeVisitor
+{
+public:
+    float _rangeFactor;
+    float _maxRange;
+    AdjustLODVisitor(float rangeFactor, float maxRange): osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN) 
+    {
+        _rangeFactor = rangeFactor;
+        _maxRange = maxRange;
+    }
+
+    void apply(osg::PagedLOD& node)
+    {
+        if (node.getNumChildren() == 0) return;
+
+        if (node.getNumFileNames() == 2) {
+            // We use internal knowledge of VPB to modify the LOD ranges. 
+            // The first child is the current node.  The second is the sub-tile at higher resolution.
+            // See VirtualPlanetBuild src/vpb/Destination.cpp CompositeDestination::createPagedLODScene() 
+            // lines 3330-3333
+            node.dirtyBound(); // At this point the bounds haven't been calculated, so we need to force this.
+            float maxRange = _maxRange + node.getBound().radius();
+            float cutoff = std::min(node.getBound().radius() * _rangeFactor, maxRange);
+            SG_LOG(SG_TERRAIN, SG_DEBUG, "VPB PagedLOD range " << cutoff << " " << maxRange);
+            node.setRange(0, cutoff, maxRange);
+            node.setRange(1, 0, cutoff);
+        } else {
+            SG_LOG(SG_TERRAIN, SG_ALERT, "Unexpected PagedLOD type in LOD range update");
+        }
+
+        traverse(node);
+    }
+};
+
 struct OSGOptimizePolicy : public OptimizeModelPolicy {
 
     
@@ -950,27 +984,34 @@ struct OSGOptimizePolicy : public OptimizeModelPolicy {
     {
         ref_ptr<Node> optimized = node;
 
-        const SGReaderWriterOptions* sgopt
+        const SGReaderWriterOptions* sgopt = SGReaderWriterOptions::copyOrCreate(opt);
-            = dynamic_cast<const SGReaderWriterOptions*>(opt);
 
-        if (fileName.find("vpb/WS_") != string::npos) {
+        if (fileName.find("ws_") != string::npos) {
             // Currently the only way we have to identify WS3.0 / VirtualPlanetBuilder files is by the filename
 
             // Clean out any existing osgTerrain techniques
             CleanTechniqueVisitor ctv;
             optimized->accept(ctv);
 
+            // Adjust the LOD ranges as required.
+            double rangeFactor = SGSceneFeatures::instance()->getVPBRangeFactor();
+            double maxRange = SGSceneFeatures::instance()->getVPBMaxRange();
+            AdjustLODVisitor alv = AdjustLODVisitor(rangeFactor, maxRange);
+            optimized->accept(alv);
+
             osg::ref_ptr<osgTerrain::Terrain> terrain = findTopMostNodeOfType<osgTerrain::Terrain>(optimized.get());
 
             if (terrain != NULL) {
                 // Top level
                 terrain->setSampleRatio(1.0);
                 terrain->setVerticalScale(1.0);
-                terrain->setBlendingPolicy(osgTerrain::TerrainTile::INHERIT);           
                 terrain->setTerrainTechniquePrototype(new VPBTechnique(sgopt));
             } else {
                 // no Terrain node present insert one above the loaded model.  
                 terrain = new osgTerrain::Terrain;
+                terrain->setSampleRatio(1.0);
+                terrain->setVerticalScale(1.0);
+                terrain->setTerrainTechniquePrototype(new VPBTechnique(sgopt));
                 //SG_LOG(SG_TERRAIN, SG_ALERT, "Creating Terrain Node for " << fileName);
 
                 // if CoordinateSystemNode is present copy it's contents into the Terrain, and discard it.

simgear/scene/tgdb/VPBTechnique.cxx

@@ -37,9 +37,10 @@
 
 
 #include <simgear/debug/logstream.hxx>
-#include <simgear/scene/util/SGReaderWriterOptions.hxx>
 #include <simgear/scene/material/Effect.hxx>
 #include <simgear/scene/material/EffectGeode.hxx>
+#include <simgear/scene/util/SGReaderWriterOptions.hxx>
+#include <simgear/scene/util/SGSceneFeatures.hxx>
 
 #include "VPBTechnique.hxx"
 
@@ -156,14 +157,12 @@ void VPBTechnique::init(int dirtyMask, bool assumeMultiThreaded)
         else
         {
             applyColorLayers(*buffer, masterLocator);
-            applyTransparency(*buffer);
         }
     }
     else
     {
         generateGeometry(*buffer, masterLocator, centerModel);
         applyColorLayers(*buffer, masterLocator);
-        applyTransparency(*buffer);
     }
 
     if (buffer->_transform.valid()) buffer->_transform->setThreadSafeRefUnref(true);
@@ -847,11 +846,10 @@ void VPBTechnique::generateGeometry(BufferData& buffer, Locator* masterLocator,
         numRows = elevationLayer->getNumRows();
     }
 
-    double scaleHeight = atof(_options->getPluginStringData("SimGear::ELEV_MESH_VERTICAL_SCALE").c_str());
-    double sampleRatio = atof(_options->getPluginStringData("SimGear::ELEV_MESH_SAMPLE_RATIO").c_str());
-    double constraint_gap = atof(_options->getPluginStringData("SimGear::ELEV_MESH_CONSTRAINT_GAP").c_str());
 
-    // OSG_NOTICE<<"Sample ratio="<<sampleRatio<<std::endl;
+    double scaleHeight = SGSceneFeatures::instance()->getVPBVerticalScale();
+    double sampleRatio = SGSceneFeatures::instance()->getVPBSampleRatio();
+    double constraint_gap = SGSceneFeatures::instance()->getVPBConstraintGap();
 
     unsigned int minimumNumColumns = 16u;
     unsigned int minimumNumRows = 16u;
@@ -865,8 +863,6 @@ void VPBTechnique::generateGeometry(BufferData& buffer, Locator* masterLocator,
         numRows = std::max((unsigned int) (float(originalNumRows)*sqrtf(sampleRatio)),minimumNumRows);
     }
 
-
-
     bool treatBoundariesToValidDataAsDefaultValue = _terrainTile->getTreatBoundariesToValidDataAsDefaultValue();
     OSG_INFO<<"TreatBoundariesToValidDataAsDefaultValue="<<treatBoundariesToValidDataAsDefaultValue<<std::endl;
 
@@ -1516,57 +1512,6 @@ void VPBTechnique::applyColorLayers(BufferData& buffer, Locator* masterLocator)
     }
 }
 
-void VPBTechnique::applyTransparency(BufferData& buffer)
-{
-    TerrainTile::BlendingPolicy blendingPolicy = _terrainTile->getBlendingPolicy();
-    if (blendingPolicy == TerrainTile::INHERIT && _terrainTile->getTerrain())
-    {
-        OSG_INFO<<"VPBTechnique::applyTransparency() inheriting policy from Terrain"<<std::endl;
-        blendingPolicy = _terrainTile->getTerrain()->getBlendingPolicy();
-    }
-
-    if (blendingPolicy == TerrainTile::INHERIT)
-    {
-        OSG_INFO<<"VPBTechnique::applyTransparency() policy is INHERIT, defaulting to ENABLE_BLENDING_WHEN_ALPHA_PRESENT"<<std::endl;
-        blendingPolicy = TerrainTile::ENABLE_BLENDING_WHEN_ALPHA_PRESENT;
-    }
-
-    if (blendingPolicy == TerrainTile::DO_NOT_SET_BLENDING)
-    {
-        OSG_INFO<<"blendingPolicy == TerrainTile::DO_NOT_SET_BLENDING"<<std::endl;
-        return;
-    }
-
-    bool enableBlending = false;
-
-    if (blendingPolicy == TerrainTile::ENABLE_BLENDING)
-    {
-        OSG_INFO<<"blendingPolicy == TerrainTile::ENABLE_BLENDING"<<std::endl;
-        enableBlending = true;
-    }
-    else if (blendingPolicy == TerrainTile::ENABLE_BLENDING_WHEN_ALPHA_PRESENT)
-    {
-        OSG_INFO<<"blendingPolicy == TerrainTile::ENABLE_BLENDING_WHEN_ALPHA_PRESENT"<<std::endl;
-        for(unsigned int i=0; i<_terrainTile->getNumColorLayers(); ++i)
-        {
-            osg::Image* image = (_terrainTile->getColorLayer(i)!=0) ? _terrainTile->getColorLayer(i)->getImage() : 0;
-            if (image)
-            {
-                enableBlending = image->isImageTranslucent();
-                break;
-            }
-        }
-    }
-
-    if (enableBlending)
-    {
-        osg::StateSet* stateset = buffer._geode->getOrCreateStateSet();
-        stateset->setMode(GL_BLEND, osg::StateAttribute::ON);
-        stateset->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
-    }
-
-}
-
 void VPBTechnique::update(osg::NodeVisitor& nv)
 {
     if (_terrainTile) _terrainTile->osg::Group::traverse(nv);

simgear/scene/tgdb/VPBTechnique.hxx

@@ -115,8 +115,6 @@ class VPBTechnique : public TerrainTechnique
 
         virtual void applyColorLayers(BufferData& buffer, Locator* masterLocator);
 
-        virtual void applyTransparency(BufferData& buffer);
-
         OpenThreads::Mutex                  _writeBufferMutex;
         osg::ref_ptr<BufferData>            _currentBufferData;
         osg::ref_ptr<BufferData>            _newBufferData;

simgear/scene/util/SGSceneFeatures.hxx

@@ -64,6 +64,21 @@ public:
     bool getVPBActive() const { return _VPBActive; }
     void setVPBActive(const bool val) { _VPBActive = val; }
 
+    float getVPBRangeFactor() const { return _VPBRangeFactor; }
+    void  setVPBRangeFactor(const float val) { _VPBRangeFactor = val; }
+
+    float getVPBMaxRange() const { return _VPBMaxRange; }
+    void  setVPBMaxRange(const float val) { _VPBMaxRange = val; }
+
+    float getVPBConstraintGap() const { return _VPBConstraintGap; }
+    void  setVPBConstraintGap(const float val) { _VPBConstraintGap = val; }
+
+    float getVPBSampleRatio() const { return _VPBSampleRatio; }
+    void  setVPBSampleRatio(const float val) { _VPBSampleRatio = val; }
+
+    float getVPBVerticalScale() const { return _VPBVerticalScale; }
+    void  setVPBVerticalScale(const float val) { _VPBVerticalScale = val; }
+
     void setEnablePointSpriteLights(bool enable)
     {
         _pointSpriteLights = enable;
@@ -150,6 +165,11 @@ private:
     bool _distanceAttenuationLights;
     int  _textureFilter;
     bool _VPBActive;
+    float _VPBConstraintGap;
+    float _VPBRangeFactor;
+    float _VPBMaxRange;
+    float _VPBSampleRatio;
+    float _VPBVerticalScale;
 };
 
 #endif