measure distance of 2 or more 3d object

[just_mik3]

hi,
i need to measure the distance between 2 or more 3d objects and give warning if the distance is less then 60 cm.
can anyone tell me how to do this?

thanks
=Mike=

[Karl Sigiscar]

v1 = member("scene").model("modelName1").worldPosition. duplicate()
v2 = member("scene").model("modelName1").worldPosition. duplicate()
dist = v1.distanceTo(v2)

if dist < 0.6000 then

put "warning"
-- Insert warning code here

end if

Be careful to not use distanceTo() in a repeat while or in a repeat with or
in an on enterFrame or in an on exitFrame script as it implies heavy
calculation.

Cheers,
Karl.

[Karl Sigiscar]

v2 = member("scene").model("modelName2").worldPosition. duplicate()

[hondo3000]

hi karl,
you said not to use distanceTo() in a repeat loop. do you know a faster way to
calculate the distance between two object?
i need something that checks the distance of many objects in a repeat loop.

[Karl Sigiscar]

Actually, the technique I use is to call distanceTo() on enterFrame or on
stepFrame ONLY ONCE OR TWICE EVERY SECOND. I compare the current ticks with
the previously saved ticks to check time everytime I reenter the frame. If a
certain amount of time has elapsed, I check the distance.

If you call distanceTo() everytime the playhead reenters the frame, it slows
things down very much.

Cheers,
Karl.

[Karl Sigiscar]

If you do it on a repeat with loop, it clogs up the CPU.

[just_mik3]

than'x
i'll try it right away.

[bgsBS]

Karl -
2 things came up in my head, seeing this thered:

1. why do you have to duplicate the objects transform, in order to calculate
the distance bitween them?

2. wouldn't actually calculating the transform, with real math be faster?

[Karl Sigiscar]

1. It's not necessary in this case indeed but it does no harm. I'm used to
duplicating so as to use the transform data rather than a reference to the
transform. Otherwise, you might modify the original transform unwittingly
and it might be the cause of a bug in your program.

2. As every Lingo instruction, distanceTo() is a wrapper to a C++ function.
Everything written in C++ is faster than anything you can come up with
written in Lingo.


"bgsBS" <webforumsuser@macromedia.com> a écrit dans le message de news:
d3qiiv$1db$1@forums.macromedia.com...

> Karl -
> 2 things came up in my head, seeing this thered:
>
> 1. why do you have to duplicate the objects transform, in order to
> calculate
> the distance bitween them?
>
> 2. wouldn't actually calculating the transform, with real math be faster?
>