#1
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constant speed on animation path
Hello, By pressing 'a', my script simply starts a car in a road. My question is how to make the car move in a constant speed. I use path.constantspeed(), but seems to me that the car will accelerate when it move along the circle. Does the way I add control point have problem?
Code:
import viz import math import time viz.go() myroad = viz.add('road4.wrl') myroad.setPosition(0,0.1,0) myroad.setScale(3.2,3.2,3.2) mymini = viz.add('mini.osgx') mymini.setPosition(-10,-10,0) y_pos_car = 0.14 path = viz.addAnimationPath() positions = [ [2,y_pos_car,50], [1,y_pos_car,35], [0,y_pos_car,25], [-1,y_pos_car,15], [-1,y_pos_car,8], [-25,y_pos_car,0], [-15,y_pos_car,-8], [-10,y_pos_car,-10], [-6,y_pos_car,-10], [-3,y_pos_car,-12], [0,y_pos_car,-18], [3,y_pos_car,-17], [6,y_pos_car,0], [10,y_pos_car,4], [15,y_pos_car,2], [25,y_pos_car,-8], [35,y_pos_car,-16], [50,y_pos_car,-10], [60,y_pos_car,20], [80,y_pos_car,40], [200,y_pos_car,200] ] for x in range(0,len(positions)): cp = viz.add(viz.CONTROL_POINT) cp.setPosition(positions[x]) path.add(cp,x+1) path.loop(viz.OFF) path.translatemode(viz.BEZIER) path.setAutoRotate(viz.ON) mymini.link(path) def mytimer(num): pass def onkeydown(key): if key == 'a': path.play() path.constantspeed(viz.ON,6.7) viz.callback(viz.KEYBOARD_EVENT, onkeydown) #keyboard event callback viz.callback(viz.TIMER_EVENT, mytimer) #timer event callback viz.starttimer(0,1/60,viz.FOREVER) #timer BTW, I cannot attach my models zip file here because it always said "Upload of file failed". What should I try? Thanks a lot! Last edited by whj; 04-21-2009 at 09:23 AM. |
#2
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Constant speed will not work with the translate mode you are using. You could try using the linear mode or creating your animation in modeling software like 3ds Max.
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#3
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Thanks anyway.
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