Re: [JAVA3D] Rotating objects over their's own axis

[Illarramendi Amilibia, Aitor]

Hi Corysia and All

        Sorry about the huge amount of attachments. It was a serious
posting, and I didn�t take care of the amount.
        Surelly Corysia, unless you were receiving continuously hundreds and
hundreds of e-mails less serious and huger than mine, only deleting my
posting from your InBox would be enough. I've a 'same amount account' too,
so I have to delete postings once a month because of the amount of postings
that I receive from the list every week. So do yo, I supose.

        Anyways, how the heck could I send postings in other ways?

        Time before, I had to receive a complain because I answered other
one from the posting list in spanish (with english translation), then it was
that spanish was not the list's language, even though there was an english
translation.

        Time after, posting some doubts I was asked for sample code.
Meanwhile I had no answer.

        Because of the difficulty of isolating some of my code in a sample,
I had no chance that sending little code pieces, but I had no answer too.

        This last time I decided to send some sample pics too, I have had no
answer but another complain...

        A little bit disturbing, don't you think so? So I do, at least.

Regards.

-----Original Message-----
From: Corysia Taware [mailto:[EMAIL PROTECTED]]
Sent: domingo 29 de julio de 2001 2:53
To: [EMAIL PROTECTED]
Subject: Re: [JAVA3D] Rotating objects over their's own axis


I hate to complain, but I think 807 kilobytes of
attachments is about 700k too much!! Some of us only
have a 6 meg e-mail quota, and this took a huge chunk
of that.

Please, if you want to illustrate something like that,
post it on a webpage and provide a link in your
e-mail.  Not eveyone has a high speed internet
connection.


--- "Illarramendi Amilibia, Aitor"
<[EMAIL PROTECTED]> wrote:
> Hello everybody:
>
>     I'm looking how to rotate an object over it's
> own X,Y or Z  axis.
>
>     The idea is to rotate them without translation,
> I mean, the object must
> still in the same point.
>
>     I have developed this code:
>
>   public void rotateOverX(double angle)
>     throws Exception
>   {
>     // PI factor for radians
>     double factor = 180d / angle;
>     // Auxiliar transform for saving the state
> before
>     Transform3D theTransformBefore = new
> Transform3D();
>     // Get it from the object's transform
>
> objectsTransform.getTransform(theTransformBefore);
>     // In a transform I make the rotation
>     Transform3D transformWithXRotation = new
> Transform3D();
>     transformWithXRotation.rotX(Math.PI/factor);
>     // Take the original matrix
>     Matrix4d mat4D = new Matrix4d();
>     theTransformBefore.get(mat4D);
>     // I translate the transform to the origin
>     theTransformBefore.setTranslation(new
> Vector3d(0.0,0.0,0.0));
>     // I take the actual transform of the view
>     Transform3D viewTransform = new Transform3D();
>
>
viewObject.getTransform().getTransform(viewTransform);
>     // I translate it to the origin too
>     viewTransform.setTranslation(new
> Vector3d(0.0,0.0,0.0));
>     // I invert it for getting out form the objects
> transform
>     viewTransform.invert();
>     // I multiply it to the transform so is out
>
>
theTransformBefore.mul(viewTransform,theTransformBefore);
>     // Then I add the rotation transform
>
>
theTransformBefore.mul(transformWithXRotation,theTransformBefore);
>     // Then I re-invert the transform of the view
> for adding again
>     viewTransform.invert();
>
>
theTransformBefore.mul(viewTransform,theTransformBefore);
>     // With the Matrix4d I add again the translation
> form the origin (set it
> back at it's point)
>     Vector3d translation = new
> Vector3d(mat4D.m03,mat4D.m13,mat4D.m23);
>     theTransformBefore.setTranslation(translation);
>     // I set it like the new transform of the object
>
> objectsTransform.setTransform(theTransformBefore);
>   }
>
> I use the same for rotating over Y and Z axis only
> using rotY or rotZ
> methods.
>
> This looks like works great, but when I change the
> view location I notice
> that is not the result I wanted to see.
>
> In the first image is an scene with an object inside
> a "building". When I
> select to rotate it I display the X,Y and Z axis
> represented by a colored
> line.
>
> I want to rotate the object over this line axis.
>
> For example I rotate it 90 degrees angle in X axis
> and in the second image
> the display looks ok. The Y axis line (green one)
> now is over the floor, and
> Z axis is in the cell of my object.
>
> Over this view ( I am over the scene objects at 0=X
> , 30=y, 0=Z point and
> looking down to the scene) if I want to rotate over
> Y axis I notice that the
> rotation is being doing like in Z axis and inversely
> with Z axis rotation.
>
> If I move the view and I try again this again with X
> axis I notice that this
> is not what I intended, I want to be carelless about
> views location and that
> objects will rotate only over X, Y or Z and it's own
> centre.
>
> See over the thrid to the seventh images and look
> how has good behavior when
> I rotate in steps of 90 degrees angle in X axis in
> some view locations.
> And see in the last four ones what does in Y axis
> with same steps.
>
> Does anyone know what happens with the method above?
>
> Thanks for advance.
>
> First image
>
>
>
>  Second Image
>
>
> Initial before X rotating
>
>
> First 90 degrees angle rotation in X axis (the red
> line at the left of the
> objects refers to X axis)
>
>
>
> Another 90 degrees in X axis
>
>
>
> Another 90 degrees in X axis
>
>
>
> And if rotate it another 90 degrees I come back to
> the same state that in
> the third image.
>
> But now if I rotate starting of the state of the
> third image in steps of 90
> degrees but in Y axis I can see this:
>
> First 90 degrees rotation in Y axis (the object is
> red because collides with
> floor and grid) note where are the axis-lines
>
>
>
> And I would like that object only had rotate over Y
> axis (so it couldn�t get
> under the grid and floor)
>
> I I rotate other 90 degrees over Y axis
>
>
>
> And other 90 degrees more
>
>
>
> With other 90 degrees more I logically come back to
> the initial state.
>
> Aitor Illarramendi Amilibia
>
> Ingeniero de software
> Detecci�n, Mando y Control
>  <http://www.indra.es/>  Indra.bmp
>
> Carretera de Loeches, 9
> 28850 - Torrej�n de Ardoz, Madrid (ESPA�A)
> Tel: +34-91-396.82.47
> Fax: +34-91-396.81.14
> [EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]>
> www.indra.es <http://www.indra.es/>
>
>
>

> ATTACHMENT part 2 image/bmp name=Indra.bmp


> ATTACHMENT part 3 image/jpeg name=normalEjes.jpg


> ATTACHMENT part 4 image/jpeg name=Xrot90.jpg


> ATTACHMENT part 5 image/jpeg name=InitialX.jpg


> ATTACHMENT part 6 image/jpeg name=1X.jpg


> ATTACHMENT part 7 image/jpeg name=2X.jpg


> ATTACHMENT part 8 image/jpeg name=3X.jpg


> ATTACHMENT part 9 image/jpeg name=1Y.jpg


> ATTACHMENT part 10 image/jpeg name=2Y.jpg


> ATTACHMENT part 11 image/jpeg name=3Y.jpg



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