LinePencil.py

from pygeo import *

v=display(scale=70)

p1 = FreePoint(-33.,-33,-3,color=WHITE)
p2 = FreePoint(-8,0,4,color=WHITE)
p3 = FreePoint(1,1,-11,color=WHITE)

plane=Plane(p1,p2,p3,color=BLUE)

point = Slider(plane,-14,16,41,color=BLUE,pointsize=1.5)

lines=LinePencil(point,plane,color=RED)

v.pickloop()