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#1
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Calculating Speed with sensor
Hello,
Right now I am trying to figure out how to calculate speed with a sensor. I know that speed is the rate of change with respect to time. So change of position / time. I know I need to get the position(pos) of the sensor first. Then i have to have a def: that will check for its new pos then do the calculation - (new pos - old pos) / time. Then after that I need to start over and set the new pos to old pos. The problem im having is trying to establish a pos before the def: starts running. Whenever I test for the old position i keep getting 0.0, 0.0, 0.0. So its going to look something like this: Code:
import viz viz.go() PORT_PPT = 6 for x in range(1): #Create sensors ppt1 = viz.add('vizppt.dls') ppt2 = viz.add('vizppt.dls') ball1 = viz.add('white_vall.wrl') ball1.scale(1,1,1) ballLink1 = viz.link(ppt1, ball1) ball2 = viz.add('white_vall.wrl') ball2.scale(1,1,1) ballLink2 = viz.link(ppt2, ball2) #controls distance in virtual world ballLink1.postScale([8,1,13],target = viz.LINK_FULL_OP) ballLink2.postScale([8,1,13],target = viz.LINK_FULL_OP) #I need to check for ball1 pos before here def speed(): #need to check for new pos for ball1 here #need to somehow get old pos of ball1 so i can do the equation #new pos - old pos /2(=1/2 second) if speed > 1: #some reaction happens in here #need to set old pos = new pos vizact.ontimer(.5, speed) Thanks |
#2
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Here is a sample function that takes any sensor object and calculates the speed of it:
Code:
import viz viz.go() sensor = viz.add('testtrack_all.dls') def CalculateSpeed(obj): #Get current and last position current_pos = obj.getPosition() last_pos = getattr(obj,'last_pos',None) if last_pos is None: #This is first call, so save position and set speed to 0 obj.last_pos = current_pos obj.speed = 0.0 else: #Compute speed using last position obj.speed = vizmat.Distance(current_pos,last_pos) / viz.elapsed() obj.last_pos = current_pos print obj.speed vizact.ontimer(0,CalculateSpeed,sensor) |
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