--- PamVMC/include/PamVMCFieldMgr.h	2009/02/19 16:50:36	1.1
+++ PamVMC/include/PamVMCFieldMgr.h	2009/06/12 18:39:18	1.5
@@ -1,6 +1,7 @@
 #ifndef PAMVMCFIELDMGR_H
 #define PAMVMCFIELDMGR_H
 #include <iostream>
+#include <RVersion.h>
 
 #include "TString.h"
 
@@ -16,8 +17,14 @@
 #include "TrkParams.h"
 #endif
 
-class PamVMCFieldMgr: public TObject {
 
+#if ROOT_VERSION_CODE >= 333572
+   #include <TVirtualMagField.h>
+   class PamVMCFieldMgr: public TVirtualMagField
+#else
+   class PamVMCFieldMgr: public TObject 
+#endif
+{
  private:
 
   static PamVMCFieldMgr * fm;
@@ -44,28 +51,28 @@
 #endif
   }
   
-  void Field(const Double_t* x, Double_t* b) const {
-
 
+  void Field(const Double_t* x, Double_t* B) {
 
 #ifdef PAMFIELD
     float xm[3]={x[0],x[1],x[2]-ZCAL-CALS3-ZSPEBP-HORMG};
 
-    b[0] = TrkParams::GetBX((float *)xm)*10;
-    b[1] = TrkParams::GetBY((float *)xm)*10;
-    b[2] = TrkParams::GetBZ((float *)xm)*10;
+    B[0] = TrkParams::GetBX((float *)xm)*10;
+    B[1] = TrkParams::GetBY((float *)xm)*10;
+    B[2] = TrkParams::GetBZ((float *)xm)*10;
     
 #else
     if(x) { 
-      for (Int_t i=0; i<3; i++) b[i] = 0.0; 
+      for (Int_t i=0; i<3; i++) B[i] = 0.0; 
     } else { 
-      b[0]=b[1]=b[2]=0.0; 
+      B[0]=B[1]=B[2]=0.0; 
     }
 #endif
     
   }
 
-  void Field(const Float_t* x, Float_t* b) const {
+
+  void Field(const Float_t* x, Float_t* b) {
 
 
 #ifdef PAMFIELD
@@ -74,16 +81,17 @@
     b[0] = TrkParams::GetBX((float *)xm)*10;
     b[1] = TrkParams::GetBY((float *)xm)*10;
     b[2] = TrkParams::GetBZ((float *)xm)*10;
-    
+
 #else
-    if(x) { 
-      for (Int_t i=0; i<3; i++) b[i] = 0.0; 
-    } else { 
-      b[0]=b[1]=b[2]=0.0; 
+    if(x) {
+      for (Int_t i=0; i<3; i++) b[i] = 0.0;
+    } else {
+      b[0]=b[1]=b[2]=0.0;
     }
 #endif
-    
+
   }
+
 };
 
 #endif