how to "bounce" sphere relative to world

[StevenAdams]

:confused;

Hi all...I'm a total newbie to 3D, but have a 2D understanding of what I'm
looking for...I want to create a spehere that "bounces" or rebounds off of the
bounds of the 3D world...At this point, the sphere could be constrained to the
x & y axis...spinning would be good, but not necessary.

like this:
[url]http://www.adveract.com/shokbobl/baubles/jumpball.htm[/url]

I can do this in 2D, but have no clue how to translate that math to the
position of the model in 3D....is this possible?

Or do I require collision detection and some sort of havok world to "bounce"
the sphere off of?

Here is my 2D lingo:
property sp
property xVelocity, yVelocity

on beginsprite(me)
sp = sprite(me.spritenum)
xVelocity = 5
yVelocity = 3
end

on exitframe()

if sp.loch > (the stage).rect.width or sp.loch < 0 then
xVelocity = -xVelocity
end if
if sp.locv > (the stage).rect.height or sp.locv < 0 then
yVelocity = -yVelocity
end if

sp.loch = sp.loch + xVelocity
sp.locv = sp.locv + yVelocity
end

[hondo3000]

i think that it is a good idea to use the havok xtra for this kind of movement,
because you can have a fast collision detection. to start with it you can try
this code. you will need:
- a shockwave3D member on the stage
- a havok member named "havok"

make a behavior out of this script and attach it to the 3D member on the stage.

code:

property pSprite, pMember, pHavok


on beginsprite me
puppettempo=60
pSprite=sprite(me.spritenum)
pMember=pSprite.member
pMember.resetworld()

pHavok=member("havok")

pHavok.initialize(pMember, 1, 1)
pHavok.gravity=vector(0,-981,0)

sphere_res=pMember.newmodelresource("sphere",#sphe re, #front)
sphere_res.resolution=25
sphere_res.radius=25

sphere01=pMember.newmodel("sphere01", sphere_res)
sphere01.addmodifier(#meshdeform)

hsphere=pHavok.makeMovableRigidBody(sphere01.name, 10, true, #sphere)
--hsphere=pHavok.makeMovableRigidBody(sphere01.name, 1, false)
hsphere.friction=0
hsphere.restitution=1

ground_res=pMember.newmodelresource("ground", #box, #front)
ground_res.height =250
ground_res.width=250
ground_res.length=250

ground=pMember.newmodel("ground", ground_res)
ground.transform.position=vector(0,-225,0)
ground.addmodifier(#meshdeform)

hground=pHavok.makeFixedRigidBody(ground.name, true, #box)
hground.friction=0
hground.restitution=0.9

end

on endsprite me
pHavok.shutdown()

end

on exitframe me
pHavok.step(0.0167, 4)
go the frame
end


i hope it will work for you.