Trigger system

..Im looking for decent, or at least usable trigger system, in order to control my previously generated portals...I saw that quite some time ago, in code archives, but it seems to be dissapeared or I just cant find it..anyone can help??

Is it this ?

nope..its not...but luckily I somehow manage to grab it from code archives..its very easy to use, fast and reliable system..

; Sphere-Box Intersection Routine

; Blitz version by si@..., based on code found at http://www.acm.org/tog/GraphicsGems/gems/BoxSphere.c
; See also http://www.realtimerendering.com/int/ and http://www.magic-software.com/Intersection.html for some more
; (non-Blitz flavoured) intersection routines

; This routine is a fast, accurate way of testing to see whether a solid sphere intersects a solid axis-aligned box.
; Useful to act as an activation zone in games - i.e. if sphere is in invisible zone then activate event.

; Use mouse to rotate camera, left and right mouse buttons to move camera forward/backward
; Move sphere by using cursor keys and r/f for rise/fall
; When the sphere touches the box, a 'collision' message should appear in the top-left hand corner of the screen

; Initialise
width=640
height=480

Graphics3D width,height,0,2
SetBuffer BackBuffer()

MoveMouse width/2,height/2

cam=CreateCamera()
PositionEntity cam,0,100,-100
RotateEntity cam,30,0,0

light=CreateLight()

; Set dimensions for box/sphere, then create them using these dimensions
bx#=0 ; box x
by#=0 ; box y
bz#=0 ; box z
bw#=50 ; box width
bh#=50 ; box height
bd#=50 ; box depth
sx#=0 ; sphere x
sy#=0 ; sphere y
sz#=0 ; sphere z
sr#=5 ; sphere radius

box=CreateCube()
EntityColor box,255,255,0
FitMesh box,0,0,0,bw,bd,bh
PositionEntity box,bx,by,bz

sphere=CreateSphere()
EntityColor sphere,255,0,0
ScaleEntity sphere,sr,sr,sr

PositionEntity sphere,sx#,sy#,sz#

While Not KeyDown(1)

; Move camera
mxs=mxs+MouseXSpeed()
mys=mys+MouseYSpeed()

RotateEntity cam,mys,-mxs,0
MoveEntity cam,0,0,MouseDown(1)-MouseDown(2)

; Move sphere
If KeyDown(203) Then sx#=sx#-1
If KeyDown(205) Then sx#=sx#+1
If KeyDown(19) Then sy#=sy#+1
If KeyDown(33) Then sy#=sy#-1
If KeyDown(200) Then sz#=sz#+1
If KeyDown(208) Then sz#=sz#-1

sx#=sx#+mx#
sy#=sy#+my#
sz#=sz#+mz#

PositionEntity sphere,sx#,sy#,sz#

RenderWorld

; Test to see if sphere intersects box
If SphereBoxIntersection(sx#,sy#,sz#,sr#,bx#,by#,bz#,bw#,bh#,bd#)=True Then Text 0,0,"Collision"

Flip

Wend


Function SphereBoxIntersection(sx#,sy#,sz#,sr#,bx#,by#,bz#,bw#,bh#,bd#)

; sx#,sy#,sz# = sphere x,y,z centre co-ordinates
; sr# = sphere radius
; bx#,by#,bz# = box x,y,z corner co-ordinates
; bw#,bh#,bd# = box width,height,depth

Local dmin#=0
Local sr2#=sr*sr

; x axis
If sx < bx

dmin=dmin+((sx-bx)*(sx-bx))

Else If sx>(bx+bw)

dmin=dmin+(((sx-(bx+bw)))*((sx-(bx+bw))))

EndIf

; y axis
If sy < by

dmin=dmin+((sy-by)*(sy-by))

Else If sy>(by+bh)

dmin=dmin+(((sy-(by+bh)))*((sy-(by+bh))))

EndIf

; z axis
If sz < bz

dmin=dmin+((sz-bz)*(sz-bz))

Else If sz>(bz+bd)

dmin=dmin+(((sz-(bz+bd)))*((sz-(bz+bd))))

EndIf

If dmin#<=sr2# Then Return True Else Return False

End Function

Here's a couple of my trigger systems, if they're any good to you.

http://www.blitzbasic.com/codearcs/codearcs.php?code=1901

http://www.blitzbasic.com/codearcs/codearcs.php?code=1920

..mm..hey Bill..nice one really (OOB)...I like it..