Changeset 1381

Timestamp:

09/15/06 20:55:07 (18 years ago)

Author:

mattausch

Message:

 

Location:

GTP/trunk/Lib/Vis/Preprocessing/src

Files:

• Preprocessor.cpp (modified) (2 diffs)
• Preprocessor.h (modified) (1 diff)
• ViewCellsManager.cpp (modified) (10 diffs)

GTP/trunk/Lib/Vis/Preprocessing/src/Preprocessor.cpp

@@ -732 +732 @@
 }
 
-#if 0 // matt: implemented interface samplestrategy
-bool
-Preprocessor::GenerateRays(
-                                                   const int number,
-                                                   const int sampleType,
-                                                   SimpleRayContainer &rays
-                                                   )
-{
-  Vector3 origin, direction; 
-  int startSize = (int)rays.size();
-  for (int i=0; (int)rays.size() - startSize  < number; i ++) {
-        // now get the direction
-        switch (sampleType) {
-        case OBJECT_BASED_DISTRIBUTION: {
-          mViewCellsManager->GetViewPoint(origin);
-          Vector3 point;
-          Vector3 normal;
-          int i = RandomValue(0, mObjects.size() - 1);
-          Intersectable *object = mObjects[i];
-          object->GetRandomSurfacePoint(point, normal);
-          direction = point - origin;
-        }
-          break;
-        case OBJECT_DIRECTION_BASED_DISTRIBUTION: {
-          int i = RandomValue(0, mObjects.size() - 1);
-          Intersectable *object = mObjects[i];
-          Vector3 normal;
-          object->GetRandomSurfacePoint(origin, normal);
-          direction = UniformRandomVector(normal);
-          origin += 0.1f*direction;
-        }
-          break;
-        case DIRECTION_BASED_DISTRIBUTION:
-          mViewCellsManager->GetViewPoint(origin);
-          direction = UniformRandomVector();
-          break;
-        case DIRECTION_BOX_BASED_DISTRIBUTION: {
-          mViewCellsManager->GetViewPoint(origin);
-          float alpha = RandomValue(0.0f, 2*M_PI);
-          float beta = RandomValue(-M_PI/2, M_PI/2);
-          direction = VssRay::GetDirection(alpha, beta);
-          break;
-        }
-        case SPATIAL_BOX_BASED_DISTRIBUTION:
-          mViewCellsManager->GetViewPoint(origin);
-          direction = mKdTree->GetBox().GetRandomPoint() - origin;
-          break;
-        default:
-          // unsuported distribution type
-          return false;
-        }
-        // $$ jb the pdf is yet not correct for all sampling methods!
-        float pdf = 1.0f;
-        float c = Magnitude(direction);
-        if (c > Limits::Small) {
-          direction*=1.0f/c;
-          rays.AddRay(SimpleRay(origin, direction, pdf));
-        }
-  }
-  return true;
-}
-#endif
 bool Preprocessor::GenerateRays(const int number,
                                                                 const int sampleType,
                                                                 SimpleRayContainer &rays)
 {
-        Vector3 origin, direction; 
-        
         const int startSize = (int)rays.size();
         SamplingStrategy *strategy = GenerateSamplingStrategy(sampleType);
 
         if (!strategy)
+        {
                 return false;
+        }
 
         for (int i=0; (int)rays.size() - startSize < number; ++ i) 
         {
                 SimpleRay newRay;
-                bool success = strategy->GenerateSample(newRay);
-
-                if (success)
+
+                if (strategy->GenerateSample(newRay))
+                {
+#if 1
                         rays.AddRay(newRay);
+#else
+                        GenerateRayBundle(rays, newRay, 16, 0);
+#endif
+                }       
         }
 
         delete strategy;
-
     return true;
 }
@@ -1417 +1359 @@
                 return CastInternalRay(viewPoint, direction, probability, vssRays, box);
         }
-#if DEBUG_RAYCAST
+#if DEBUG_RAYCAST       
   Debug<<"CRF "<<flush;
 #endif  
+}
+
+
+bool Preprocessor::GenerateRayBundle(SimpleRayContainer &rayBundle,                                                                     
+                                                                         const SimpleRay &mainRay,
+                                                                         const int number,
+                                                                         const int pertubType) const
+{
+        rayBundle.push_back(mainRay);
+
+        const float pertubOrigin = 10.0f;
+        const float pertubDir = 0.0f;
+
+        for (int i = 0; i < number - 1; ++ i)
+        {
+                Vector3 pertub;
+
+                pertub.x = RandomValue(0.0f, pertubDir);
+                pertub.y = RandomValue(0.0f, pertubDir);
+                pertub.z = RandomValue(0.0f, pertubDir);
+                const Vector3 newDir = mainRay.mDirection + pertub;
+                //const Vector3 newDir = mainRay.mDirection;
+
+                pertub.x = RandomValue(0.0f, pertubOrigin);
+                pertub.y = RandomValue(0.0f, pertubOrigin);
+                pertub.z = RandomValue(0.0f, pertubOrigin);
+                const Vector3 newOrigin = mainRay.mOrigin + pertub;
+                //const Vector3 newOrigin = mainRay.mOrigin;
+
+                rayBundle.push_back(SimpleRay(newOrigin, newDir, 0));
+        }
+
+        return true;
 }
 

GTP/trunk/Lib/Vis/Preprocessing/src/Preprocessor.h

@@ -150 +150 @@
                            );
   
+  bool GenerateRayBundle(
+          SimpleRayContainer &rayBundle,
+          const SimpleRay &mainRay,
+          const int number,
+          const int shuffleType) const;
+
   virtual void CastRays(SimpleRayContainer &rays,
                                                 VssRayContainer &vssRays);

GTP/trunk/Lib/Vis/Preprocessing/src/ViewCellsManager.cpp

@@ -324 +324 @@
 int ViewCellsManager::Construct(Preprocessor *preprocessor, VssRayContainer *outRays)
 {
-        mPreprocessor = preprocessor;
-
         int numSamples = 0;
 
@@ -331 +329 @@
         VssRayContainer initialSamples;
 
+        // store pointer to preprocessor for further use during construction
+        mPreprocessor = preprocessor;
+        
+        
+        ///////////////////////////////////////////////////////
+        //-- Initial sampling for the construction of the view cell hierarchy. 
+        //-- We use uniform sampling / box based sampling.
+        
+        long startTime = GetTime();
+
         cout << "view cell construction: casting " << mInitialSamples << " initial samples ... ";
-
-        long startTime = GetTime();
-
-        //-- construction rays => we use uniform samples for this
-
+        // cast initial samples
         CastPassSamples(mInitialSamples, mSamplingType, initialSamples);
-        
+
         cout << "finished in " << TimeDiff(startTime, GetTime()) * 1e-3 << " secs" << endl;
 
@@ -356 +360 @@
                   << TimeDiff(startTime, GetTime()) * 1e-3 << " secs" << endl;
 
-        // take post processing time
-        startTime = GetTime();
-
-        //-- stats after construction
+
+        ///////////////////////////////////////////
+        //-- Initial hierarchy construction finished
+        //-- We can do some stats and visualization
+        
         ResetViewCells();
         Debug << "\nView cells after initial sampling:\n" << mCurrentViewCellsStats << endl;
 
-        if (0) // export initial view cells
+
+        //-- optionally export initial view cells
+        if (0) 
         {
                 const char filename[] = "view_cells.wrl";
                 Exporter *exporter = Exporter::GetExporter(filename);
-
         
                 if (exporter)
@@ -385 +391 @@
         }
 
-        //-- guided rays are used for further sampling
+
+        ////////////////////////////////////////////////
+        //
+        //-- Cast some more sampling after initial construction.
+        //-- The additional rays can be used to gain
+        //-- some more information before the bottom-up merge
+        //-- note: guided rays could be used for this task
+
+        // time spent after initial construction
+        startTime = GetTime();
+
         const int n = mConstructionSamples; //+initialSamples;
-
         // should we use directional samples?
         bool dirSamples = (mSamplingType == Preprocessor::DIRECTION_BASED_DISTRIBUTION);
 
-        //-- do some more sampling
         while (numSamples < n)
         {
@@ -412 +426 @@
 
                 cout << "finished" << endl;
-
                 cout << "computing sample contribution for " << (int)constructionSamples.size() << " samples ... ";
 
@@ -421 +434 @@
                 cout << "finished" << endl;
 
-
                 disposeRays(constructionSamples, outRays);
-
                 cout << "total samples: " << numSamples << endl;
         }
 
-        //-- post processing
-        VssRayContainer postProcessSamples;
-
-        cout << "casting " << mPostProcessSamples << " post processing samples ... ";
-
-        // cast post processing samples rays  (storing the view cells if wanted)
-        CastPassSamples(mPostProcessSamples,
-                                        mSamplingType, 
-                                        postProcessSamples);
-
-        cout << "finished" << endl;
-
-        // stats before post processing (i.e., merge)
+        
+        ////////////////////////////////////////////////
+        //-- get stats after the additional sampling step
+        //-- and before the bottom-up merge step
+
         EvaluateViewCellsStats();
-        Debug << "\noriginal view cell partition before post process:\n" << mCurrentViewCellsStats << endl;
+        Debug << "\noriginal view cell partition before post process:\n" 
+                  << mCurrentViewCellsStats << endl;
 
         mRenderer->RenderScene();
@@ -450 +454 @@
 
 
+
+        ///////////////////////////////////////////////
+        //
+        //-- post processing of the initial construction
+        //-- We can bottom-up merge the view cells in this step
+
+
+        // we can additionally cast some post processing sample rays.
+        // These rays can be used to store the view cells with the rays
+        VssRayContainer postProcessSamples;
+        cout << "casting " << mPostProcessSamples << " post processing samples ... ";
+        
+        CastPassSamples(mPostProcessSamples, mSamplingType, postProcessSamples);
+
+        cout << "finished" << endl;
         cout << "starting post processing and visualization" << endl;
 
-        // store view cells for postprocessing
+        // store view cells for post processing?
         const bool storeViewCells = true;
 
@@ -458 +477 @@
                 ComputeSampleContributions(postProcessSamples, true, storeViewCells);
 
-        //-- post processing (e.g.,merging) of the view cells
-        if (1) PostProcess(preprocessor->mObjects, postProcessSamples);
+        PostProcess(preprocessor->mObjects, postProcessSamples);
 
         cout << "time needed for post processing (merge) step: "
@@ -470 +488 @@
 
         
-        //return 1;
-        // evaluation of the paritition, i.e., a number of new samples are cast
+        /////////////////////////////////////////////////////////////////////
+        //-- Evaluation of the resulting view cell partition. 
+        //-- We cast a number of new samples and measure the render cost
+
         if (mEvaluateViewCells)
         {
@@ -477 +497 @@
         }
 
+        
+        ///////////////////////////////////
+        //-- Finally, we do some visualization
+
         if (mShowVisualization)
         {
-                //-- visualization
                 VssRayContainer visualizationSamples;
 
-                //-- construction rays => we use uniform samples for this
+                //-- visualization rays, e.g., to show some samples in the scene
                 CastPassSamples(mVisualizationSamples,
                                             Preprocessor::DIRECTION_BASED_DISTRIBUTION,