WorldViz User Forum  

Go Back   WorldViz User Forum > Vizard

Thread Tools Rating: Thread Rating: 2 votes, 5.00 average. Display Modes
Old 09-12-2012, 07:42 AM
pwsnow pwsnow is offline
Join Date: Apr 2012
Posts: 23
Picking up Vizard Objects on mouse down with collisions

I'm trying to pick up vizard objects using a vizshape sphere as an end effector.

Because I have multiple objects I'm using onCollideBegin to grab the objects when the end effect collides with the object to be picked up. This work fine but the end effector doesn't let go of the object and it is automatic, however I want to be able to pick up objects when I touch them and hold them as long as the left mouse button is pressed. Releasing the object once the left mouse button is released. I have the below code in my updateview method:

def onCollideBegin(e):
		#while vizact.whilemousedown(viz.MOUSEBUTTON_LEFT):
			if e.obj1 == sphere:
				if e.obj2 == cube:
					link = viz.grab(sphere,cube)
					#viz.playSound( 'crashNew.wav' )
					libc.haDeviceSendString(dev, "set myDamper enable",response)
				if e.obj2 == cube2:
					link = viz.grab(sphere,cube2)
					libc.haDeviceSendString(dev, "set myDamper enable",response)
				if e.obj2 == ball:
					link = viz.grab(sphere,ball)
					libc.haDeviceSendString(dev, "set myDamper enable",response)			
	def onCollideEnd(e):
		if e.obj1 == sphere:
				if e.obj2 == cube:
					link = None
					libc.haDeviceSendString(dev, "set myDamper disable",response)
				if e.obj2 == cube2:
					link = None
					libc.haDeviceSendString(dev, "set myDamper disable",response)
				if e.obj2 == ball:
					link = None
					libc.haDeviceSendString(dev, "set myDamper disable",response)

Because def onCollideBegin/End is using an event how would I "wrap up" these two methods with the mouse down/up?

Many thanks.
Reply With Quote
Old 09-13-2012, 02:49 PM
Jeff Jeff is offline
WorldViz Team Member
Join Date: Aug 2008
Posts: 2,471
Here's an example that uses viz.phys.intersectNode to determine if the hand and object are intersecting. If they are intersecting and the mouse event occurs the object will be grabbed:
import viz
import vizact
import vizmat
import viztracker


piazza = viz.add('piazza.osgb')

#Add crates marker for participant to walk to
crate1 = viz.addChild('crate.osgb',pos=[-0.3,0.3,4],scale=[0.6,0.6,0.6])
crate2 = crate1.clone(pos=[0.35,0.3,4],euler=[5,0,0],scale=[0.6,0.6,0.6])
crate3 = crate1.clone(pos=[0.3,0.9,4.1],euler=[-5,0,0],scale=[0.6,0.6,0.6])

arrow = viz.addChild('arrow.wrl',scale=[0.3,0.3,0.3])

#enable physics and apply shapes
arrow.disable( viz.DYNAMICS )
arrow.disable( viz.PHYSICS )

#Link arrow to mousetracker
viewTracker = viztracker.Keyboard6DOF()
viewlink = viewTracker, viz.MainView )
tracker = viztracker.MouseTracker()
trackerlink = tracker, arrow )
closest = None

def updateClosest():
	global closest
	list = viz.phys.intersectNode( arrow )
	if list != []:
		for object in list:
			if object == piazza:

		closestDistance = 999999
		arrowPos = arrow.getPosition()
		for object in list:
			distance = vizmat.Distance(arrowPos,object.getPosition())
			if distance < closestDistance:
				closest = object
				closestDistance = distance
		closest = None

link = None
grabbedObject = None
def onMouseDown():
	global link, grabbedObject
	if closest is not None:
		link = viz.grab( arrow, closest )
		grabbedObject = closest
def onMouseUp():
	global link, grabbedObject
	if grabbedObject is not None:
		grabbedObject = None
vizact.onmousedown( viz.MOUSEBUTTON_LEFT, onMouseDown )
vizact.onmouseup( viz.MOUSEBUTTON_LEFT, onMouseUp )

Last edited by Jeff; 09-14-2012 at 09:38 AM.
Reply With Quote
Old 09-17-2012, 02:02 AM
pwsnow pwsnow is offline
Join Date: Apr 2012
Posts: 23
Excellent, works like a charm.

Many thanks again!
Reply With Quote

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Vizard 4 Beta Testing farshizzo Announcements 0 02-01-2011 10:46 AM
Vizard 4 Beta Testing farshizzo Vizard 0 02-01-2011 10:46 AM
Trouble picking text3d objects Salvar Vizard 4 12-01-2010 03:07 PM
Vizard tech tip: Using the Python Imaging Library (PIL) Jeff Vizard 0 03-23-2009 11:13 AM
Pivot points for child objects in Vizard with 3ds Max Gladsomebeast Vizard 0 09-19-2006 11:21 AM

All times are GMT -7. The time now is 04:42 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2023, vBulletin Solutions, Inc.
Copyright 2002-2023 WorldViz LLC