Here is a sample script that draws arbitrary arrows on the screen. Hope this helps:
Code:
import viz
import vizmat
viz.go()
def addArrow(begin,end):
ARROW_SIZE = 0.015
#Find distance between points
d = vizmat.Distance(begin,end)
#Draw arrow line
viz.startlayer(viz.LINES)
viz.linewidth(5)
viz.vertex(0,0,0)
viz.vertex(0,d,0)
#Draw arrow tip
viz.startlayer(viz.TRIANGLES)
viz.vertex(-ARROW_SIZE,d,0)
viz.vertex(0,d+(2*ARROW_SIZE),0)
viz.vertex(ARROW_SIZE,d,0)
#Finish drawing arrow
arrow = viz.endlayer(parent=viz.SCREEN)
#Place/rotate arrow to match begin end points
arrow.setPosition(begin)
arrow.setEuler(0,0,-vizmat.AngleToPoint(begin,end))
return arrow
arrow1 = addArrow([0.2,0.2,0],[0.4,0.4,0])
arrow1.color(viz.GREEN)
arrow2 = addArrow([0.6,0.2,0],[0.8,0.9,0])
arrow2.color(viz.RED)