home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Amiga Plus 1995 #5 & #6
/
Amiga Plus CD - 1995 - No. 5 and 6.iso
/
pd
/
grafik
/
lightwave
/
lightwave-apr95
/
000778_owner-lightwave-l _Wed Apr 26 23:07:08 1995.msg
< prev
next >
Wrap
Internet Message Format
|
1995-05-06
|
4KB
Return-Path: <owner-lightwave-l>
Received: by netcom22.netcom.com (8.6.12/Netcom)
id TAA14593; Wed, 26 Apr 1995 19:59:07 -0700
Received: from mickey.risd.edu by netcom22.netcom.com (8.6.12/Netcom)
id TAA14576; Wed, 26 Apr 1995 19:59:00 -0700
Received: from minnie by mickey.risd.edu (5.65/Ultrix3.0-C)
id AA03982; Wed, 26 Apr 1995 22:59:17 -0400
Received: by minnie.risd.edu (5.65/Ultrix3.0-C)
id AA27195; Wed, 26 Apr 1995 23:00:17 -0400
Date: Wed, 26 Apr 1995 22:48:23 -0400 (EDT)
From: Joe Angell <jangell@risd.edu>
Subject: Re: GOALS in LW????
To: Peter Bowmar <bpj1@titan.np.ac.sg>
Cc: LightWave Mailing List <LIGHTWAVE-L@netcom.com>
In-Reply-To: <Pine.SV4.3.91.950427102912.11483A-100000@titan.np.ac.sg>
Message-Id: <Pine.3.05.9504262217.E26916-c100000@minnie>
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: owner-lightwave-l@netcom.com
Precedence: bulk
On Thu, 27 Apr 1995, Peter Bowmar wrote:
> Hello. Yep, GOALS are in LW4.0. Could you do me a really really big
> favour and tell me what it says in the manual with respect to Goals? I
> can't for the life of me figure out how to work it, and the manual that
> comes with it is the same as LW 3.5 for the Amiga (it even makes Arexx
> references, that oughta confuse the poor PC people...). If you don't have
> time, I totally understand. Thanks.
>
>
> ------------
> Peter Bowmar
> ------------
>
> And remember, if it says "Microsoft" you know it sucks!
>
OK, for all you people with LW 4.0 and no docs... (I'm assuming no one
else knows how to do this, either (except JG :) ):
USING GOALS:
Whenever you have an object or bone selected in Layout, the Target button
reads "Goals".
By selecting a goal object in this pop-up menu, you can thell an object
(or bone) to always "reach" for the goal. Any objects/bones that are
parented in a chain will react as the last item in the chain reaches for
the goal. In other words, you could pull a robots finger, and the arm
would follow (as far as it can, of course)
(JOE'S NOTE: From what I can tell, there's no method of doing sliding
joints with IK in this. Anyone know? (sorta like ED-209's (Robocop) legs))
HOW GOALS WORK:
1. In Modeler, creat a rectangualr box that has the aprox. dimensions of
an arm and make sure the pivot point/center is located at the end of the
arm. Export it to layout as "ARM".
2. Clone it 3x, so you have 4 arms.
3. Parent arm 2 to 1, 3 to 2 and 4 to 3.
4. Select arm 1, then create a key for Selected Item & Desendants
5. Add a Null Object and Save (rename) it as "GOAL NULL"
6. Select Arm 4 and set it's Goal to the Goal Null.
7. Select the Goal Null and move it aroud and see how the others follow.
8. This may not give us exactly what we want since the pivot point is what
is reaching for the goal. In order to get the end of the arm to point to
the goal, we need to add a null object and parent it to arm 4, then romve
to Goal from arm 4 and assign it to the new Null.
TIPS:
You can limit movement of joints by turning off they're rotations (H, P,
B) to make the chain easier to work with (JOE: Someone let me know it
doing this for movement will let you make sliding joints -- in case you
couldn't tell, I need it...)
In order to use Goals with Bones, you need to set up a similar arrangement
where a bunch of bonaes are parented to an end bone which has the Goal
selected. Ussing Add Child Bone will make positioning the new bones MUCh
easier.
OK, that's it, more-or-less word for word with some paraphrasing. Lemme
know how it works...
-- Joe