Changeset 5779 for OpenSceneGraph/trunk/examples/osgshadow/osgshadow.cpp

Timestamp:

11/30/06 11:29:03 (6 years ago)

Author:

robert

Message:

Added movement of the light source to test performance of update the shadow volumes

Files:

• OpenSceneGraph/trunk/examples/osgshadow/osgshadow.cpp (modified) (3 diffs)

OpenSceneGraph/trunk/examples/osgshadow/osgshadow.cpp

@@ -133 +133 @@
     }
 
+    bool postionalLight = false;
+    while (arguments.read("--positionalLight")) postionalLight = true;
+    while (arguments.read("--directionalLight")) postionalLight = false;
+
+    bool addOccluderToScene = false;
+    while (arguments.read("addOccluderToScene")) addOccluderToScene = true;
+
+    bool updateLightPosition = true;
+
     // any option left unread are converted into errors to write out later.
     arguments.reportRemainingOptionsAsUnrecognized();
@@ -150 +159 @@
         return 1;
     }
-    
-    
-    osg::ref_ptr<osg::Geode> geode = new osg::Geode;
-
+
+    // get the bounds of the model.    
+    ComputeBoundingBoxVisitor cbbv;
+    model->accept(cbbv);
+    osg::BoundingBox bb = cbbv.getBoundingBox();
+    
+    osg::ref_ptr<osg::Group> group = new osg::Group;
+    group->addChild(model.get());
+
+    // set up the occluder
     osg::ref_ptr<osgShadow::OccluderGeometry> occluder = new osgShadow::OccluderGeometry;
     occluder->computeOccluderGeometry(model.get());
-
-    ComputeBoundingBoxVisitor cbbv;
-    model->accept(cbbv);
     cbbv.getPolytope(occluder->getBoundingPolytope(),0.001);
-    osg::BoundingBox bb = cbbv.getBoundingBox();
-
-    //geode->addDrawable(occluder.get());
+
+    if (addOccluderToScene)
+    {
+        osg::ref_ptr<osg::Geode> geode = new osg::Geode;
+        geode->addDrawable(occluder.get());
+        group->addChild(geode.get());
+    }
     
     osg::ref_ptr<osgShadow::ShadowVolumeGeometry> shadowVolume = new osgShadow::ShadowVolumeGeometry;
 
-#if 1
-//    occluder->comptueShadowVolumeGeometry(osg::Vec4(bb.xMin()+ bb.radius(), bb.yMin()+ bb.radius(), bb.zMax() + bb.radius()  ,1.0f), *shadowVolume);
-    occluder->comptueShadowVolumeGeometry(osg::Vec4(bb.center().x(), bb.center().y(), bb.zMax() + bb.radius()  ,1.0f), *shadowVolume);
-#else
-    occluder->comptueShadowVolumeGeometry(osg::Vec4(0.5f,.25f,0.2f,0.0f), *shadowVolume);
-#endif
-    geode->addDrawable(shadowVolume.get());
-
-
-    osg::ref_ptr<osg::Group> group = new osg::Group;
-    group->addChild(model.get());
-    group->addChild(geode.get());
+    shadowVolume->setUseDisplayList(!updateLightPosition);
+
+    osg::Vec4 lightpos;
+    
+    if (postionalLight)
+    {
+        lightpos.set(bb.center().x(), bb.center().y(), bb.zMax() + bb.radius()  ,1.0f);
+    }
+    else
+    {
+        lightpos.set(0.5f,0.25f,-0.8f,0.0f);
+    }
+
+    {
+        osg::ref_ptr<osg::Geode> geode = new osg::Geode;
+        occluder->comptueShadowVolumeGeometry(lightpos, *shadowVolume);
+        geode->addDrawable(shadowVolume.get());
+        group->addChild(geode.get());
+    }
+
 
 
@@ -189 +213 @@
       // wait for all cull and draw threads to complete.
       viewer.sync();
+
+        if (updateLightPosition)
+        {
+            float t = viewer.getFrameStamp()->getReferenceTime();
+            if (postionalLight)
+            {
+                lightpos.set(bb.center().x()+sinf(t)*bb.radius(), bb.center().y() + cosf(t)*bb.radius(), bb.zMax() + bb.radius()  ,1.0f);
+            }
+            else
+            {
+                lightpos.set(sinf(t),cosf(t),-0.8f,0.0f);
+            }
+            occluder->comptueShadowVolumeGeometry(lightpos, *shadowVolume);
+       }
 
       // update the scene by traversing it with the the update visitor which will