Moving view with object

[Xliben]

Ok, this is probably going to sound REALLY dumb so excuse me but I am new to Vizard.

What I would like to is make it so when I have a Wheelbarrow move the camera stays behind it at a specified distance. I currently only have the Wheelbarrow moving (and that doesn't even completely work seeing as when I move forward or backwards meanwhile turning the object slows down and goes for twice the time it should); anyway, I have tried nearly everything I could find but nothing seems to work so... heres what I have... it doesn't work at all so any assistance what so ever would be soooooooooo helpful.

BTW to anyone who cares this is going to be used for a game prototype so any additional information would be much appreciated.

Most of the script below has been derived from tutorials within the trial version. Thanks

import viz
viz.go()

viz.mouse(viz.OFF)

viz.add('tut_ground.wrl')
Wheelbarrow = viz.add('wheelbarrow.ive')

UPDATE_RATE = 0.001

view = viz.add(viz.VIEWPOINT)

Wheelbarrow.translate(0,0,6)

MOVE_SPEED = 10
TURN_SPEED = 360

MOVE_FORWARD = vizact.move(0,0,MOVE_SPEED,.01)
MOVE_BACKWARD = vizact.move(0,0,-MOVE_SPEED,.01)

TURN_RIGHT = vizact.spin(0,1,0,TURN_SPEED,.01)
TURN_LEFT = vizact.spin(0,-1,0,TURN_SPEED,.01)

def mytimer (num1):
if viz.iskeydown(viz.KEY_UP):
Wheelbarrow.add(MOVE_FORWARD)
elif viz.iskeydown(viz.KEY_DOWN):
Wheelbarrow.add(MOVE_BACKWARD)
elif viz.iskeydown(viz.KEY_RIGHT):
Wheelbarrow.add(TURN_RIGHT)
elif viz.iskeydown(viz.KEY_LEFT):
Wheelbarrow.add(TURN_LEFT)
viz.callback(viz.TIMER_EVENT,mytimer)
viz.starttimer(1,0.01,viz.PERPETUAL)

def updateview(num1):
POS = Wheelbarrow.get(viz.POSITION)
view.goto([viz.get(Wheelbarrow.get(viz.POSITION))],5,5)

[farshizzo]

Hi,

I've modified your script a little to do what I believe you want it to do. I've commented the parts of the code that modify the viewpoint. Let me know if this isn't exactly what you are looking for.

import viz
viz.go()

viz.mouse(viz.OFF)

viz.add('tut_ground.wrl')
Wheelbarrow = viz.add('wheelbarrow.ive')

#Get handle to main viewpoint
view = viz.get(viz.MAIN_VIEWPOINT)

Wheelbarrow.translate(0,0,6)

MOVE_SPEED = 10
TURN_SPEED = 360

def mytimer(num1):
	#Move wheelbarrow using arrow keys
	if viz.iskeydown(viz.KEY_UP):
		Wheelbarrow.translate(0,0,MOVE_SPEED*viz.elapsed(),viz.RELATIVE_LOCAL)
	elif viz.iskeydown(viz.KEY_DOWN):
		Wheelbarrow.translate(0,0,-MOVE_SPEED*viz.elapsed(),viz.RELATIVE_LOCAL)
	if viz.iskeydown(viz.KEY_RIGHT):
		Wheelbarrow.rotate(0,1,0,TURN_SPEED*viz.elapsed(),viz.RELATIVE_LOCAL)
	elif viz.iskeydown(viz.KEY_LEFT):
		Wheelbarrow.rotate(0,1,0,-TURN_SPEED*viz.elapsed(),viz.RELATIVE_LOCAL)

	#Create transform from wheelbarrow
	xform = viz.Transform(Wheelbarrow.get(viz.MATRIX))
	#Move position up 1 meter and back 5 meters
	xform.preTrans(0,1,-5)
	#Apply position of transform to viewpoint
	view.translate(xform.getTrans())
	#Have viewpoint look at wheelbarrow
	view.lookat(Wheelbarrow.get(viz.POSITION))
	
viz.callback(viz.TIMER_EVENT,mytimer)
viz.starttimer(1,0,viz.PERPETUAL)

[Xliben]

Thanks a million it looks great!