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  #1  
Old 03-11-2005, 02:01 AM
exhale exhale is offline
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Join Date: Feb 2005
Posts: 19
triggering actions on proximity

Hello,

i run through the api but couldn't find
a feasable solution.
This is my problem: I would like to
trigger an event / action when the
viewpoint is near a certain object
or in a certain area, how can i
make this happen?

greetz,

Kevin
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  #2  
Old 03-11-2005, 11:03 AM
farshizzo farshizzo is offline
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Join Date: Mar 2003
Posts: 2,849
You can use hotspots to detect when the viewpoint has entered or left a given area. Here is a simple script that creates a circular hotspot at the location (0,3) with radius 1.
Code:
import viz
viz.go()

viz.add('tut_ground.wrl')

#Declare some hotspot IDs
ENTER = 0
LEAVE = 1

#Declare Radius of hotspot
RADIUS = 1

#Declare position of hotspot
HOTSPOT_X = 0
HOTSPOT_Z = 3

def onhotspot(id,x,y,z):
	if id == ENTER:
		print 'Entered hotspot'
		#Create a hotspot that will be triggered when we leave the circle
		viz.starthotspot(LEAVE,viz.CIRCLE_HOTSPOT_OUT,HOTSPOT_X,HOTSPOT_Z,RADIUS)
	elif id == LEAVE:
		print 'Leaving hotspot'
		#Create a hotspot that will be triggered when we enter the circle
		viz.starthotspot(ENTER,viz.CIRCLE_HOTSPOT_IN,HOTSPOT_X,HOTSPOT_Z,RADIUS)

viz.callback(viz.HOTSPOT_EVENT,onhotspot)

#Create a hotspot that will be triggered when we enter the circle
viz.starthotspot(ENTER,viz.CIRCLE_HOTSPOT_IN,HOTSPOT_X,HOTSPOT_Z,RADIUS)
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  #3  
Old 03-14-2005, 02:03 AM
exhale exhale is offline
Member
 
Join Date: Feb 2005
Posts: 19
Hello,

thanks for your help, but i can't get it to trigger..
The text in the if statements isn't printed, so i guess it's never reached. I only changed the X, Z values of your script so it was surrounding my object. I'll post an excerpt of the code:

#hotspot IDs
ENTER = 0
LEAVE = 1

#Radius of hotspot
RADIUS = 5

#position of hotspot
HOTSPOT_X = 30
HOTSPOT_Z = 17.5

tbox = viz.add('tbox_paars.wrl')
tbox.translate(30,0,17.5)

tbox2 = viz.add('tbox_rood.wrl')
tbox2.translate(30,0,17.5)
tbox2.visible(viz.OFF)

def onhotspot(id,x,y,z):
if id == ENTER:
print 'Entered hotspot'
tbox.visible(viz.TOGGLE)
tbox2.visible(viz.TOGGLE)
#Create a hotspot that will be triggered when we leave the circle
viz.starthotspot(LEAVE,viz.CIRCLE_HOTSPOT_OUT,HOTS POT_X,HOTSPOT_Z,RADIUS)

elif id == LEAVE:
print 'Leaving hotspot'
tbox.visible(viz.TOGGLE)
tbox2.visible(viz.TOGGLE)
#Create a hotspot that will be triggered when we enter the circle
viz.starthotspot(ENTER,viz.CIRCLE_HOTSPOT_IN,HOTSP OT_X,HOTSPOT_Z,RADIUS)

#hotspot -> onhotspot
viz.callback(viz.HOTSPOT_EVENT,onhotspot)
#Create a hotspot that will be triggered when we enter the circle
viz.starthotspot(ENTER,viz.CIRCLE_HOTSPOT_IN,HOTSP OT_X,HOTSPOT_Z,RADIUS)

ps: Code is indented correctly in the editor

any ideas why this isn't working?

EDIT: i also tried leaving out the if statements and doing the visible toggling straight away, which didn't work either. The method is never entered. I also tried with a rectangle, put collision on or off, which didn't give me any success..

greets and thanks in advance!

Kevin

Last edited by exhale; 03-14-2005 at 02:17 AM.
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  #4  
Old 03-14-2005, 02:26 AM
exhale exhale is offline
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Join Date: Feb 2005
Posts: 19
Hello,

ok i did manage to get it to work with the rectangular option. Will try with circle too.
Maybe my width & depth were to small.

Thanks & greets,

Kevin
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