Не подскажете а как сделать так чтоб выстрел происходил при нажатие мыше в этом коде:

Graphics3D 800,600,32
Type s
Field entity
Field upt
End Type
Function s_construct.s(ctrl,ctrl2)
obj.s=New s
obj\entity=CreateSphere(8,ctrl)
EntityParent obj\entity,0
PointEntity obj\entity,ctrl2
obj\upt=-1
Return obj
End Function
Function s_update()
For o.s=Each s
If o\upt=-1
o\upt=MilliSecs()
EndIf
dt=MilliSecs()-o\upt
o\upt=MilliSecs()
MoveEntity o\entity,0,0,dt*0.1
If EntityDistance(o\entity,a)>100
FreeEntity o\entity
Delete o
EndIf
Next
End Function
Global a=CreateCube()
EntityAlpha a,0.5
b=CreateCube(a)
ScaleEntity b,0.25,.25,.25
EntityColor b,100,0,0
MoveEntity b,0,0,3
camera=CreateCamera()
MoveEntity camera,0,0,-15
light=CreateLight()
Color 255,255,0
SetBuffer BackBuffer()
time=MilliSecs()
While Not KeyHit(1)
dtm=MilliSecs()-time
time=MilliSecs()
v#=dtm*0.01
TurnEntity a,v,v,v
If MilliSecs()-tcr>300
s_construct(a,b)
tcr=MilliSecs()
EndIf
s_update()
RenderWorld()
;=
CameraProject camera,EntityX(a),EntityY(a),EntityZ(a)
x1=ProjectedX()
y1=ProjectedY()
CameraProject camera,EntityX(b,True),EntityY(b,True),EntityZ(b,True)
x2=ProjectedX()
y2=ProjectedY()
Line x1,y1,x2,y2
;=
Flip
Wend
End