Still can be done with a single TG. Just combine the Transform3D
accordingyl. I'd always try to keep scenegraph structures as simple as
possible to avoid unnecessary computations of bounds and such.
- J
----- Original Message -----
From: "Jaakko Holopainen" <[EMAIL PROTECTED]>
To: <JAVA3D-INTEREST@JAVA.SUN.COM>
Sent: Saturday, June 18, 2005 3:47 PM
Subject: Re: [JAVA3D] Space Shuttle Physics?
Thanks John,
The reason Im working with two TransformGroups is the fact that if the
shuttle is moving in a certain direction just turning the shuttle will not
change that movement. Only after applying a new thrust with the new
direction will cause the new movement to be applied to the old movement.
The old movement will never end unless a 100% opposite thrust is applied.
----- Original Message -----
From: "John Wright" <[EMAIL PROTECTED]>
To: <JAVA3D-INTEREST@JAVA.SUN.COM>
Sent: Saturday, June 18, 2005 4:09 PM
Subject: Re: [JAVA3D] Space Shuttle Physics?
Jaakko,
Welcome to the list (you'll probably soon get the standard "this list
isn't supported any more go participate on another list" messages).
Why use two separate TransformGroups? I move my avatars with a single
TransformGroup.
All you need are the basic geometry formulas for working with angles and
distances (triangles) and you can calculate the correct new position
based on your angle and speed. (Grab any high school geometry book if
you aren't familar with them off the top of your head)
- John Wright
Starfire Research
Jaakko Holopainen wrote:
> Hi, hello everyone this is my intro to the list as well.
>
> Im doing a space shuttle simulation and need some help with one thing,
>
> I have a set up a shulttle in a structure like this:
>
> TransformGroup1
> -> TransformGroup2
> -> Shuttle
>
> The idea is that the movement of the shuttle is performed in the
> TransformGroup1,
> and the rotation of the shuttle in TransformGroup2.
>
> I also have a few Vectrors to hold the data i need.
>
> Vector3f speedVector (basically just the z set to some value).
> Vector3f thrustVector (the z value increasing while a buton is pressed
and
> 0.0f if not).
>
> I then have a main loop calling enach 1/100 of a second an update
shuttle
> method, which does the following:
>
> 1. get the current transformation from TransformGroup1.
> 2. get the current rotation from TransformGroup2.
>
> 3. apply the thrust to the speed.
> 4. apply the speed to the TransformGroup1.
>
> This far i have made it and the shuttle can now be sent in one (hard
coded)
> direction and rotated (with MouseRotate).
>
> What i would like to know is how could i make the thrust applied in
> combination with the rotation in
> TransformGroup2 so that the direction of movement could be changed.
>
> Can someone describe what are the 16 float's that can be get from a
> Transform3D object.
>
>
> BR,
> Jaakko Holopainen
>
>
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