*	FieldLines.g4bl - display magnetic field lines.
*
*	Display magnetic field lines for 5 solenoids.

# uncomment the following line to get a white background
#g4ui when=4 "/vis/viewer/set/background 1 1 1"

# display magnetic field lines
fieldlines exit=1  center=0,0,0 nLines=100

# five solenoids (note transparency to show lines inside them)
coil C innerRadius=100 outerRadius=120 length=100
solenoid S coil=C current=100 color=1,0,0,0.3
place S z=0 
place S z=500
place S z=-500
place S z=1000
place S z=-1000

# physics is required, even though it is not used.
physics QGSP_BERT