add shader for terrain

Author: uwewoessner

src/OpenCOVER/plugins/general/GeoData/GeoDataLoader.cpp

@@ -382,6 +382,7 @@ bool GeoDataLoader::init()
 
     selectionName = new ui::Label(editGroup, "name");
     selectionName->setText("nothing is selected");
+    shader = coVRShaderList::instance()->get("Brightness");
 
     return true;
 }
@@ -420,6 +421,7 @@ void GeoDataLoader::setRegionEnabled(const std::string &region_name, bool enable
                 terrainRoot->addChild(terrainNode);
                 terrainNode->setName(region_name);
                 terrainNode->setNodeMask(showTerrain ? 0xffffffff : 0x0);
+		shader->apply(terrainNode);
             }
         }
 

src/OpenCOVER/plugins/general/GeoData/GeoDataLoader.h

@@ -39,6 +39,7 @@
 #include <cover/ui/Label.h>
 #include <cover/ui/SelectionList.h>
 #include <optional>
+#include <cover/coVRShader.h>
 
 #include <OpenVRUI/coCombinedButtonInteraction.h>
 #include <cover/coIntersection.h>
@@ -138,6 +139,7 @@ class GeoDataLoader : public opencover::coVRPlugin,
     static GeoDataLoader *s_instance;
     PJ_CONTEXT *ProjContext;
     PJ *ProjInstance;
+    opencover::coVRShader *shader=nullptr;
 
     std::map<std::string, osg::ref_ptr<osg::Node>> loadedTerrains;
     std::map<std::string, osg::ref_ptr<osg::Node>> loadedBuildings;