Changeset 371 for trunk/VUT/GtpVisibilityPreprocessor

Timestamp:

11/02/05 23:59:16 (19 years ago)

Author:

mattausch

Message:

added render heuristics evaluation

Location:

trunk/VUT/GtpVisibilityPreprocessor

Files:

• scripts/default.env (modified) (1 diff)
• src/SamplingPreprocessor.cpp (modified) (4 diffs)
• src/SamplingPreprocessor.h (modified) (1 diff)

trunk/VUT/GtpVisibilityPreprocessor/scripts/default.env

@@ -82 +82 @@
         #       input fromViewCells
         #       input fromSceneGeometry
-                samples 200000
+                samples 100000
                 sideTolerance 0.005
         }

trunk/VUT/GtpVisibilityPreprocessor/src/SamplingPreprocessor.cpp

@@ -531 +531 @@
                 cout << "#totalPvsSize=" << mKdTree->CollectLeafPvs() << endl;
   
-        // merge or subdivide view cells
         if (mBspTree)
         {
@@ -538 +537 @@
                 Debug << "original pvs size: " << mBspTree->CountViewCellPvs() << endl;
 
+                // merge or subdivide view cells
                 long startTime = GetTime();
                 int merged = PostprocessViewCells(mSampleRays);
@@ -548 +548 @@
                 Debug << "merged pvs size: " << mBspTree->CountViewCellPvs() << endl;
 
+
+                cout << "evaluating render time heuristics ... ";
+                Real rt = EvaluateRenderHeuristics();
+                cout << "finished" << endl;
+
+                Debug << "render time: " << rt * 1e-3 << endl;
         }
         
@@ -881 +887 @@
         }
 }
+
+Real SamplingPreprocessor::EvaluateRenderHeuristics()
+{
+        Real renderTime = 0;
+
+        const float objRt = 1.0f; // render time for 1 object of PVS
+        const float vcOverhead = 1.0f; // const overhead for crossing a view cell border
+        
+        float totalArea = 0;
+
+        ViewCellContainer viewCells;
+
+        mBspTree->CollectViewCells(viewCells);
+
+        ViewCellContainer::const_iterator it, it_end = viewCells.end();
+        PolygonContainer::const_iterator pit;
+
+        for (it = viewCells.begin(); it != it_end; ++ it)
+        {
+                // surface area substitute for probability
+                PolygonContainer cell;
+                float area = 0;
+
+                mBspTree->ConstructGeometry(dynamic_cast<BspViewCell *>(*it), cell);
+
+                for (pit = cell.begin(); pit != cell.end(); ++ pit)
+                        area += (*pit)->GetArea();
+                
+                renderTime += area * (*it)->GetPvs().GetSize() * objRt;
+                totalArea += area;
+        }
+
+        renderTime /= totalArea;
+
+        renderTime += (float)viewCells.size() * vcOverhead;
+        
+        return renderTime;
+}

trunk/VUT/GtpVisibilityPreprocessor/src/SamplingPreprocessor.h

@@ -97 +97 @@
         int PostprocessViewCells(const RayContainer &rays);
 
+        /** Simulated rendering using a simple render heuristics. Used to evaluate the 
+                quality of the view cell partition.
+        */
+        Real EvaluateRenderHeuristics();
 };