Collision of an avatar with a quad

[Frank Verberne]

Hi all,

I'm having some problems with a task I'm making. I want to do something when an avatar touches a texquad. Therefore I created the texquad, added a collidebox around it and tested the situation. If I let the avatar touch the texquad in the beginning, something happens, but if I move the texquad 50 cm in front of the avatar and I let the avatar touch the texquad later, nothing happens. My code:

import viz
#import vizmocap
import random

#viz.go( viz.HMD | viz.FULLSCREEN | viz.STEREO )
viz.go()

viz.phys.enable()

environment = viz.add('gallery.ive')

quad = viz.addTexQuad()
#quad.setPosition(0,1.5,.5) #doesn't work
quad.setPosition(0,1.5,.1) #does work (once)
quad.scale(.25, .25, .25)
quad.collideBox()
quad.color(255,255,255)
quad.enable(viz.COLLIDE_NOTIFY)#object 1 for collision
quad.disable( viz.DYNAMICS )

avatar = viz.add('vcc_female.cfg')
avatar.collideMesh() #object 2 for collision
avatar.disable( viz.DYNAMICS )
#vizmocap.LiveCharacter('192.168.2.103',8050,model=avatar)
viz.MainView.translate(0,1.80,-2)

def onCollide(e):#e.obj1 == quad & e.obj2 == avatar
	if e.obj1.getColor() == [255,255,255]:
		print "white"
		e.obj1.color(viz.GREEN)
	else:
		print "green"

viz.callback( viz.COLLIDE_BEGIN_EVENT, onCollide )

I use the LiveCharacter plugin to move the avatar, but that shouldn't be the problem (I think). What I want is that the callbackfunction is activated every time the avatar collides with the collidebox around the texquad. I.e. green should be printed the second time the texquad is touched. Can somebody help me?

[farshizzo]

When you call collideMesh on an avatar, it saves the current mesh state of the avatar and performs all subsequent collision tests with this mesh. Animating an avatar will not update the collide mesh.

For some of our demos we added dynamic collisions with live avatars by constructing collision shapes for each major limb of the avatar and updating them every frame. We plan on including this code with the vizmocap module in a future release. I will try to post some of that code here when I get a chance.

[Frank Verberne]

Please post this code as soon as you can. In the meantime, I could just move the quad (using a sensor) to the original position of the avatar I guess. I would gladly receive the code if you have the time however!

[Frank Verberne]

Hi Farshizzo,

Could you post the code for dynamic collision with live characters? The rest of the task is done now, and I have been struggling with the code to create something like you said (collision shapes for each major limb) but haven't been succesfull. I also tried to put avatar.collidemesh() into a timer, but that was too demanding (regarding the CPU I guess).

Thanks in advance!

[farshizzo]

Do you need dynamics on the collision, or do you just need to know when the avatar touches an object?

[Frank Verberne]

I don't really know what the difference is, but what my task is that a participant controlling an avatar has to touch several quads. Each quad has a bounding box around it, and every time the avatar touches the quad (i.e. enters the bounding box) the program checks if the number is the lowest of the 6 quads. If it is, the quad will turn green, otherwise the quad wil become red for a few seconds and then restore itself. This task is done multiple times.

So I think that I only need to know when the avatar (no matter which part of the avatar) touches the quads. Hope that clarifies the situation.