Changeset 1824 for GTP/trunk/Lib/Vis/Preprocessing/src/AxisAlignedBox3.cpp

Timestamp:

11/28/06 19:46:36 (18 years ago)

Author:

bittner

Message:

global lines support

File:

• GTP/trunk/Lib/Vis/Preprocessing/src/AxisAlignedBox3.cpp (modified) (1 diff)

GTP/trunk/Lib/Vis/Preprocessing/src/AxisAlignedBox3.cpp

@@ -2310 +2310 @@
 }
 
-
-}
-
+Vector3
+AxisAlignedBox3::GetUniformRandomSurfacePoint() const
+{
+        // get face based on its surface area
+        float pdf[7];
+        pdf[0] = 0.0f;
+        int i;
+        for (i=0; i < 6; i++) {
+                pdf[i+1] = pdf[i] + GetFace(i).GetArea();
+        }
+        
+        float x = RandomValue(0, pdf[6]);
+        for (i=0; i < 6; i++) {
+                if (x < pdf[i])
+                        break;
+        }
+
+        const int idx = i-1;
+        
+        const Rectangle3 face = GetFace(idx);
+        
+        Vector3 point = Vector3(0,0,0);
+        float sum = 0.0f;
+
+        for (i = 0; i < 4; ++ i) 
+        {
+                const float r = RandomValue(0, 1);
+                sum += r;
+                point += face.mVertices[i] * r;
+        }
+
+        point *= 1.0f / sum;
+
+        //normal = face.GetNormal();
+
+        return point;
+}
+
+
+}
+