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View Full Version : How to calculate a distance between a moving Avatar and the viewpoint?


JohnSenior
04-25-2017, 09:27 AM
Dear smart Forum member,

I need to calculate the distance between the position of Avatars, moving from waypoint to waypoint, and the position of the user. At the end of each trial, the minimum distance between viewpoint of the user and avatar at any given time point of the trial should be printed out. I got this far in regard of calculating the distance towards a stable object (at 0.4, 1.8, 0; in this case):
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# Globals
pos = []
minDist = 10000
posModel = [0.4,1.8,0]

#euklidische Distanz
def dist(posModel):
global minDist
pos = viz.MainView.getPosition()
dist = [(a - b)**2 for a, b in zip(pos, posModel)]
dist = math.sqrt(sum(dist))
if dist < minDist:
minDist = dist
print minDist
print dist

vizact.ontimer(0.1,dist, posModel)

def quit():
global minDist
print minDist
viz.quit()

vizact.onkeydown('q',quit)

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My problem: How do I get the position of Avatars, while they are moving from waypoint to waypoint? Is there a way to get the Position of moving avatars similar to "viz.MainView.getPosition()" for the Position of the user?

Best,
John

Jeff
04-26-2017, 12:56 AM
You can use the getPosition (http://docs.worldviz.com/vizard/#commands/node3d/getPosition.htm) command with any node3D object. This returns the position of the object's center point which is defined in the modeling software. In the case of the avatar, this center point is at the avatar's feet level. To get the distance between points use the vizmat.Distance (http://docs.worldviz.com/vizard/#commands/vizmat/Distance.htm) command. If you're checking the distance between an avatar and the viewpoint you'll want to take into account the different height values of each. The following code prints out the distance between avatars and an avatar and the viewpoint:

import viz
import vizact
import vizmat
viz.go()

viz.add('piazza.osgb')
avatar1 = viz.addAvatar('vcc_male2.cfg',pos=[0.5,0,0])
avatar2 = viz.addAvatar('vcc_male2.cfg',pos=[-0.5,0,0])

walk1 = vizact.walkTo([5,0,15])
walk2 = vizact.walkTo([-5,0,15])
avatar1.addAction(walk1)
avatar2.addAction(walk2)

def printDistances():
avatar1_pos = avatar1.getPosition()
avatar2_pos = avatar2.getPosition()
x,y,z = viz.MainView.getPosition()
print "Distance between avatars", vizmat.Distance(avatar1_pos,avatar2_pos)
# zero viewpoint height and check distance to avatar
print "Distance between view and avatar1", vizmat.Distance([x,0,z],avatar1_pos)

vizact.ontimer(1,printDistances)

JohnSenior
04-28-2017, 07:57 AM
Thank you so much!