#1
|
|||
|
|||
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
|
|||
|
|||
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) |
Thread Tools | |
Display Modes | Rate This Thread |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Creating a Vizard Sensor Plugin | farshizzo | Plug-in development | 25 | 08-01-2019 01:24 AM |
speed on animation path | whj | Vizard | 8 | 11-17-2008 08:41 PM |
wiimote and sensor bar | masaki | Vizard | 1 | 03-06-2008 04:07 PM |
Multiple Copies of same sensor plugin | RedSpikeyThing | Plug-in development | 2 | 02-12-2008 03:10 PM |
using sensor data in Physics1.py | Eunice | Vizard | 4 | 01-03-2006 06:18 AM |