Use frag model

[u/mrichter/AliRoot.git] / FMD / AliFMDGeometry.h

diff --git a/FMD/AliFMDGeometry.h b/FMD/AliFMDGeometry.h
index 35760cea4798a5d428973d0658320f4dbf8fd8e0..754667a79806a9aab764b4cba630cce0f7f332a7 100644 (file)
--- a/FMD/AliFMDGeometry.h
+++ b/FMD/AliFMDGeometry.h
@@ -210,6 +210,29 @@ public:
   virtual Bool_t Impact(const TParticle* particle) const;
   /** Declare alignable volumes */
   virtual void SetAlignableVolumes() const;
+
+
+  /** 
+   * Service function to convert Cartisean XYZ to r, eta, phi, and theta.   
+   *
+   * Note, that the z input should be corrected for the vertex location 
+   * if needed.
+   * 
+   * @param x      Cartisean X coordinate
+   * @param y      Cartisean Y coordinate 
+   * @param z      Cartisean Z coordinate 
+   * @param r      On return, the radius
+   * @param eta    On return, the pseudo-rapidity
+   * @param phi    On return, the azimuthal angle
+   * @param theta  On return, the polar angle;
+   *
+   * @return kTRUE on success, kFALSE in case of problems
+   */     
+  static Bool_t XYZ2REtaPhiTheta(Double_t  x,   Double_t y, 
+                                Double_t  z, 
+                                Double_t& r,   Double_t& eta, 
+                                Double_t& phi, Double_t& theta);
+
 protected:
   Bool_t        fIsInitialized; // Whether singleton is initalized
   AliFMDRing*  fInner;         // Inner ring geometry information