Changeset 2899 for GTP/trunk/App/Demos/Vis/FriendlyCulling/src/SampleGenerator.cpp

Timestamp:

09/03/08 13:02:39 (16 years ago)

Author:

mattausch

Message:

 

File:

• GTP/trunk/App/Demos/Vis/FriendlyCulling/src/SampleGenerator.cpp (modified) (1 diff)

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

@@ -118 +118 @@
         //cout << "minDist after= " << minDist << endl;
 }
+
+
+SphericalSampleGenerator::SphericalSampleGenerator(int numSamples, float radius):
+SampleGenerator(numSamples, radius)
+{}
+
+
+
+
+void SphericalSampleGenerator::Generate(Sample2 *samples) const
+{
+        static HaltonSequence halton;
+        float r[2];
+
+        for (int i = 0; i < mNumSamples; ++ i)
+        {
+                halton.GetNext(2, r);
+
+                // create stratified samples over sphere
+                const float rx = r[0];
+                const float ry = r[1];
+
+                const float theta = 2.0f * acos(sqrt(1.0f - rx));
+                const float phi = 2.0f * M_PI * ry;
+
+                float x = sin(theta) * cos(phi);
+                float y = sin(theta) * sin(phi);
+                float z = cos(theta);
+
+                // project to disc
+                samples[i].x = x / z;
+                samples[i].y = y / z;
+        }
+}