created

apps/nexus/zcurve.h

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+#ifndef VCG_ZCURVE_H
+
+#include <vcg/space/box3.h>
+
+namespace vcg {
+
+class ZCurve: public Box3f {
+public:
+
+  unsigned int side;
+
+  ZCurve(): side(1024) {}
+
+  void SetSide(int s) { assert(s <= (1<<10)); side = s; }
+
+  unsigned int Pos(const Point3f &p) const {
+    assert(!IsNull());
+    unsigned int position = 0;
+    
+    float x = (p[0] - min[0])/(max[0] - min[0]);
+    float y = (p[1] - min[1])/(max[1] - min[1]);
+    float z = (p[2] - min[2])/(max[2] - min[2]);
+
+    unsigned int s = side;
+    while(s > 1) {
+      position *= 8;
+      x *= 2;
+      y *= 2;
+      z *= 2;
+      int dx = (int)floor(x);
+      int dy = (int)floor(y);
+      int dz = (int)floor(z);
+      position += dx + 2 * dy + 4 * dz;
+      x -= dx;
+      y -= dy;
+      z -= dz;
+      s /= 2;
+    }
+    return position;
+  }
+};
+
+}
+
+
+#endif