Rotation around an arbitrary axis in Flex

I am hoping to animate the rotation of an object around an arbitrary axis. Is it possible to do this with the animation classes in Flex 4? I can get it to work using the Rotate3D function, but only around the x-, y- or z-axis. I'll explain... I have objects that are subclasses of FilledElements, because I need them to be filled with bitmaps. These elements are created using drawPath, because they can be any type of polygon in the xy plane. I need to be able to "flip" an object, using any one of its sides as an axis. The "flip" is a 3D rotation. The flip works for a rectangle whose width is parallel to the x-axis or length is parallel to the y-axis. But, if I have a triangle or other polygon whose sides are not parallel to any axes? How can I generate a 3D rotation on one of its sides?
I tried setting different values using SimpleMotionPath on the transform property. I tried using the animation class, but it needs a property, and I'm not sure what property maps to what I need. I thought changing the transform property using SimpleMotionPath might work, but that doesn't do it. I have tried using matrix.appendRotation on the object, but I'm not sure how to animate using that function.
Thanks! Any help would be appreciated.

It is not the spheres I am worried about in this instance. I can move the spheres as I need to however, there are linking cylinders between those spheres. I easily find the midpoint for the cylinder to be located at but the cylinder needs to be aligned so it is pointing to the central sphere and the external sphere. That is what the above code is trying to generate, a matrix4d transform that rotates and aligns the cylinder along the direction required.
Cheers
Mark

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H there,
Can I know how do I make a still picture rotate around a vertical axis ?
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Thanks MTD,
It is indeed one good trick ...
From your timeline, it seems that you applied a transition after each clip. Can I know why & what transition you applied ?
Can you please elaborate what you meant by "I changed the last keyframe in the last clip to a Smooth" ?
Thanks again ...
Cheers
Meg The Dog wrote:
Hi -
While Mr. Wolsky is absolutely correct that you need the other software to do the effect you describe correctly, I believe you can make an approximation of what you want using FCE. Whether or not it passes the smell test is up to you.
You can see a clip I made [HERE|http://www.spotsbeforeyoureyes.com/3DTurn_Example.mov]
Because when you rotate the frame 360 degrees using the Y-axis, the image always comes back to the same position - which gives you a handy place to match cut to the next implementation of the rotation at a slightly slower pace. The last rotation was smoothed to a stop by modifying the filter keyframe to "Smooth".
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!http://www.spotsbeforeyoureyes.com/3dTurnTimeline.jpg!
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Hi,
I am trying to rotate an object around its local Y axis instead of the global Y axis.
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TransformGroup rotate(Node node) , Alpha alpha){
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here is my version of SimpleObject3D that i wrote a while back, it does all these things and a bit more, no comments so you would have to work your head around the code...
there are better ways to what i did, but this was the first code i wrote for j3d, there was an object3d i wrote which fits this class if i'll find it i will add it here too....
have fun
package object3D;
import java.util.ArrayList;
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          Vector3d vec=new Vector3d(moveX,moveY,moveZ);
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}Edited by: TacB0sS on Apr 3, 2009 1:53 AM the old code was too old it was one of my first, very stupidly done, this should be easier to understand

Having trouble with multiple rotations around an objects poles

Hey all, i am new to java 3d (only started coding today) but i have been coding in Java for a while..
I am having a problem understanding how to perform the rotations i want to. I have read the majority of the literature i can find on performing these kinds of rotations. I realise that i need to have correctly linked nodes in the graph so that i am rotating around the correct points and i think i have accomplished this. However, i cannot get the system to rotate around the objects poles. To clarify, i can get the object to rotate around one of its poles (x , y, z) in some cases but trying to do multiple rotations causes problems.
import javax.media.j3d.Appearance;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.ColoringAttributes;
import javax.media.j3d.PolygonAttributes;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.vecmath.Color3f;
import javax.vecmath.Vector3f;
import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.geometry.Cylinder;
import com.sun.j3d.utils.universe.SimpleUniverse;
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private Transform3D rotY = new Transform3D()
private Transform3D rotZ = new Transform3D();
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          TransformGroup poleYTransformGroup = new TransformGroup(poleYTransform);
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                    // TODO Auto-generated catch block
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          // TODO Auto-generated method stub
          new TestRotation();
}As you can see the code is a full class so you can copy and paste it to run it... In the 'begin' method you will notice the variables that update the rotation, currently when the cube rotates on the y axis the cube is rotating around the viewers Y axis and not around the objects y pole. However, if you change the values so the cube is set to rotate around the X axis then it will treat the x axis as the objects x pole and not the viewers x axis. I presume this is because of the multiplication of the matrices.
What i want to know is how can i set it so that if i say rotate around the y axis it rotates the cube around its y axis (as in the y pole) regardless of where the y pole is. Not only that but i need to be able to rotate around multiple axis ensuring that it is rotating around the objects poles correctly.
The reason for this is that the object will be turned into an auv (underwater vehicle) fitted with thrusters which are going to turn the vehicle so no matter how the vehicle is positioned (facing up, upside down etc) the thruster always rotate around the same axis on the block.
Hope this makes sense, sorry for the long post!!
edd
Message was edited by:
edwardr

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Animate a cube to rotate around x axis!!!

Hi! I'm trying to animate a cube to rotate around x axis using RotationInterpolator object.
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--DM

lol
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http://www.martinb.com/maths/geometry/rotations/conversions/index.htm
http://www.martinb.com/maths/geometry/rotations/conversions/matrixToEuler/index.htm
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