Changeset 2873 for GTP/trunk/App/Demos/Vis/FriendlyCulling/src/SampleGenerator.cpp

Timestamp:

08/27/08 15:09:04 (16 years ago)

Author:

mattausch

Message:

 

File:

• GTP/trunk/App/Demos/Vis/FriendlyCulling/src/SampleGenerator.cpp (modified) (2 diffs)

GTP/trunk/App/Demos/Vis/FriendlyCulling/src/SampleGenerator.cpp

@@ -19 +19 @@
 void PoissonDiscSampleGenerator::Generate(Sample2 *samples) const
 {
+        // this is a hacky poisson sampling generator which does random dart-throwing
+        // until it is not able to place any dart for a number of tries
+        // in this case, the required min distance is reduced
+        // the solution is a possion sampling with respect to the adjusted min distance
+        // better solutions have been proposed, i.e., using hierarchical sampling
+
+        const float maxTries = 1000;
+        const float f_reduction = 0.9f;
+
         static HaltonSequence halton;
         float r[2];
 
         // generates poisson distribution on disc
-        float minDist = 4.0f / sqrt((float)mNumSamples);
+        float minDist = 2.0f / sqrt((float)mNumSamples);
 
         //cout << "minDist before= " << minDist << endl;
@@ -66 +75 @@
                         }
 
-                        if (tries > 2000)
+                        if (tries > maxTries)
                         {
-                                minDist *= 0.9f;
+                                minDist *= f_reduction;
                                 tries = 0;
                         }