Rotation around a different point

I have a geometry that I am scaling and translating to appear in the center of my screen. It is still rotating around the original 0,0 axis. How can I change where the rotation center point is

Rotations in 3D graphics is a bit weird. Help me explain...
Take a blank piece of paper, and draw a little dot on it, roughly in the middle.
Put the page down in front of you on a flat surface.
The dot represents 0, 0, 0
Take a small object (I took a memory stick) and place it anywhere on the piece of paper. This represents your 3D object.
Now, in real life, if you want to have your object spin around in place, you'd simply turn it with your finger. On the other hand, to have your 3D model spin like that, things work a bit differently.
Close your eyes.
Remember where on the paper your object is, and its orientation. Pick it up and place it down on the dot (at 0, 0, 0), but keep it facing in exactly the same way it was when you picked it up. This is step 1 of your rotation sequence.
Next, turn it a little bit in any direction. This is step 2 of the sequence.
Now, place it back where it was on the page, but now facing in the "new" direction. Step 3.
Finally, open your eyes. Step 4. You have now rendered the rotated object and it appears to have spinned in place.
Repeat steps 1 - 4 and you'll have an animated 3D object.
Now, to have that object orbit an arbitrary point in space, the same sequence as above must be followed, except for one modification to the first step. In stead of the center of rotation coinciding with the center of the object, it now lies some distance off in some direction.
That new center of rotation is the point which must be moved (translated) to the dot (origin). When you perform your rotation, the object will "swing" around the new point (which now lies at 0, 0, 0). When you translate the point back to where it came from, and then display that frame, it will appear as if the 3D object's rotation had taken place around your intended center of rotation, or as you call it, your "different point".
I hope you now understand the most basic concept of 3D rotation, and that you will be able to translate these thoughts into working code :)

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How do you rotate around a local point?

Hi,
I'm having problems using RotationInterpolators.
I'm trying to build a 3d figure and animate it. I can use pickRotate behaviours to rotate the different limbs around their local centres, but I'm now trying to do it via the RotationInterpolator and every time they get moved to the central point of the whole scene, and rotated around this, rather than that of their own TransformGroup.
I have a BranchGroup (objRoot), and a TransformGroup for the entire figure (figTrnsGrp), which is the child of objRoot, and is centred. The children of figTrnsGp are a cylinder (the figure's upper chest), and four TransformGroups - one each for the neck, pelvis, left shoulder, and right shoulder. These in turn have their own TransformGroup children which deal with the other parts of the body. I added the RotationInterpolator as a child of the TransformGroup I want it to rotate.
So, for example, I want the pelvis to rotate around its own centre (taking the legs with it, which it does, but it gets moved up and rotated around the centre of the figure!). Actually, i can't work out if it's being rotated round the figure centre, or the scene centre, but anyway it's not doing what i want it to and I've been trying different things for days, and none of them work, so if anyone can PLEASE help, i'd really appreciate it!
I think the problem may be that the Transform3D which is passed to the RotationInterpolator is somehow being reset in the process, but I still can't work it out.
Here is some of the code:
pelvisT3D = new Transform3D();
pelvisT3D.setTranslation(new Vector3f(0.0f, -0.4f, 0.0f));
pelvisTrnsGrp = new TransformGroup(transformPelvis);
pelvisTrnsGrp.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
pelvisTrnsGrp.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
figTrnsGrp.addChild(pelvisTrnsGrp);
Sphere pelvis = new Sphere(pelvissize);
pelvisTrnsGrp.addChild(pelvis);
Alpha alpha = new Alpha(-1, Alpha.INCREASING_ENABLE, 0, 0, 7000, 0, 0, 0, 0, 0);
pelvisTrnsGrp.getTransform(pelvisT3D);
RotationInterpolator r = new RotationInterpolator(alpha,
pelvisTrnsGrp, pelvisT3D, 0.0f, 3.0f);
r.setSchedulingBounds(behaveBounds);
pelvisTrnsGrp.addChild(r);
many thanks to anyone who can help...

Hi
The problem is indeed that the RotationInterpolater will reset the transform to the identity before adding the rotation. The solution is to have your pre-animation transforms in one TransformGroup, and have another TransformGroup below that the interpolater acts on.
BranchGroup-TransformGroup-TransformGroup-Shape3D
^ ^
Your translations Attach the
go here Interpolator here
B.D.

How to always rotate objects around the same point, even using the right-click menu?

I need some of my objects to always rotate around the same point. How can I select a point which will stay that way?
Using the rotate tool resets after deselecting.
Also, I'd like to rotate objects around a certain point even when using the right click > Transform > Rotate.
Is it possible?

Right, so this is where Illustrator falls short with respect you your need, but only in the sense that the reference point can't be made to stick. You can, however, use Smart Guides to make it so the point is easy to set at exactly the same location, (especially since your object has an anchor point there), manually before each rotation.

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;
public class TestRotation
     private TransformGroup objectTranslateGroup, objectRotationGroup;
     private Transform3D translate = new Transform3D(); private Transform3D rotX = new Transform3D();
private Transform3D rotY = new Transform3D()
private Transform3D rotZ = new Transform3D();
     private double rotationX, rotationY, rotationZ, newRot = 10;
     private SimpleUniverse u;
     public TestRotation()
          // Create the root of the branch graph
          BranchGroup objRoot = new BranchGroup();
          rotationX = 0; //init rotations
          rotationY = 0;
          rotationZ = 0;
          ColorCube cube = new ColorCube(0.25f);
          Appearance x = new Appearance();
          Appearance y = new Appearance();
          Appearance z = new Appearance();
          x.setColoringAttributes(new ColoringAttributes(new Color3f(1,0,0),ColoringAttributes.SHADE_GOURAUD));
          y.setColoringAttributes(new ColoringAttributes(new Color3f(0,1,0),ColoringAttributes.SHADE_GOURAUD));
          z.setColoringAttributes(new ColoringAttributes(new Color3f(0,0,1),ColoringAttributes.SHADE_GOURAUD));
          Cylinder poleX = new Cylinder(0.02f, .75f, x); //RED
          Cylinder poleY = new Cylinder(0.02f, .75f, y); //BLUE
          Cylinder poleZ = new Cylinder(0.02f, .75f, z); //GREEN
          Transform3D poleXTransform = new Transform3D();
          Transform3D poleYTransform = new Transform3D();
          Transform3D poleZTransform = new Transform3D();
          poleXTransform.rotZ(Math.toRadians(90));
          poleZTransform.rotX(Math.toRadians(90));
          TransformGroup poleXTransformGroup = new TransformGroup(poleXTransform);
          TransformGroup poleYTransformGroup = new TransformGroup(poleYTransform);
          TransformGroup poleZTransformGroup = new TransformGroup(poleZTransform);
          poleXTransformGroup.addChild(poleX);
          poleYTransformGroup.addChild(poleY);
          poleZTransformGroup.addChild(poleZ);
          translate = new Transform3D();
          translate.setTranslation(new Vector3f(0,0,0)); //init position
          rotX.rotX(Math.toRadians(rotationX));
          rotY.rotY(Math.toRadians(rotationY));
          rotZ.rotZ(Math.toRadians(rotationZ));
          objectTranslateGroup = new TransformGroup();
          objectTranslateGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
          objectRotationGroup = new TransformGroup();
          objectRotationGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
          objectRotationGroup.addChild(cube); //add the object to the rotation group
          objectRotationGroup.addChild(poleXTransformGroup); //add the object to the rotation group
          objectRotationGroup.addChild(poleYTransformGroup); //add the object to the rotation group
          objectRotationGroup.addChild(poleZTransformGroup); //add the object to the rotation group
          objectTranslateGroup.addChild(objectRotationGroup); //add the rot group to translate group
          objRoot.addChild(objectTranslateGroup); //add to root
          u = new SimpleUniverse();
          u.getViewingPlatform().setNominalViewingTransform();
          u.addBranchGraph(objRoot);
          this.begin();
     private void begin()
          while(true)
               //rotationX += newRot; //rotate slightly
               rotationY += newRot;
               rotationX += 0; //rotate slightly
               //rotationY += 0;
               rotX.rotX(Math.toRadians(rotationX));
               rotY.rotY(Math.toRadians(rotationY));
               rotZ.rotZ(Math.toRadians(rotationZ));
               rotY.mul(rotX); //multiply rotations
               rotZ.mul(rotY);
               objectRotationGroup.setTransform(rotZ); //update
               try {
                    Thread.sleep(300);
               } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
     public static void main(String[] args) {
          // 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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The reason for this is that a two router setup is likey to create IP address conflicts on the network, which likely may be your issue.
To check, open Macintosh HD > Applications > Utiltiies > AirPort Utility
Click on the Time Capsule icon, then click Edit
Click the Network tab at the top of the next window
Insure that the setting for Router Mode is set to Off (Bridge Mode)
Click Update to save the correct setting
Then power cycle the entire network by powering off all devices in any order that you want
Wait a minute
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Snap rotate an Object by 60 degrees around a selected point?

Hello,
I am looking for a simple and precise way to rotate and copy an object at precisely 60 degree increments around a preselected point that is NOT the middle of the object.
To restate: I want to be able to have all my objects at precise angles and be rotating around a selected pre-chosen point.
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Dave-o

I just checked the Download-able Help PDF (the Illustrator CS4 Online manual) and it is indeed documented under "Rotate an object by a specific angle" Unfortunately, it does not jump out off the screen.
I understand why they don't ship manuals to reduce cost and keep a greener footprint, but I really miss them especially when you pay $500+ for a software suite. Next time I will RTFOLM! :-)
Thanks again Scott
Dave-o

How can I rotate a shape around a centre point in Illustrator?

Hi all,
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I also want to define this as a shape/pattern and use in Photoshop, how do I go about this?
Many thanks,
Foxy

The centroid of a straight-sided polygon is located at the average of its corner points locations. For a given path (a star, for example) you can:
1. Select the path.
2. Copy. PasteInFront.
3. Object>Path>Average>Both.
For objects with curved segments, you can approximate the centroid by:
1. Select the path.
2. Copy. PasteInFront.
3. Apply some command that adds a bunch of points along the curves (Object>Path>Add Anchor Points, or ZigZag with zero for Size).
4. Object>Path>Average>Both.
If you have alot of paths you need to do that for all at once (as when designing a hanging mobile), I have a simple Javascript for that.
JET

Final cut color balance key framing - Marker rotating around the center, giving a pink hue

Hi
I'm currently editing a music video that uses a single shot, but it progresses through many different scenes and lighting conditions. What I'm doing is keyframing the different color corrections so they smoothly transition as the camera pans across different sets.
The problem I'm having is that during the transition from one correction to the next, the marker rises up into the pink area. This gives the transition and awkward and unwanted pink/red hue at the peak of the transition before it settles down into what I wanted.
An example is one scene I keyframe a warm yellow and as it transitions into the scene I keyframe a cool blue. But during the transition, the marker rotates around the middle of the corrected and always goes up into the pink area instead of just simply going from Point A to point B
I'm sure it's just a setting I've clicked as it was working fine before
I'm using the color corrector 3-way
Final cut pro 7
Mac OSX Lion 10.7.4

You might try adding edits using the blade tool and dissolving between the color corrections rather than keyframing. When you keyframe, it's got to get from one color setting to another so the parameters will have to change over time which is what I imagine is happening to you. Not sure how my scheme would work, but worth a try.

Rotate about a specific point

I have a script that creates geologic map symbols, positions them, and rotates them into their proper orientation. However, I do not know how to rotate about a specific point (not the center of the group). The portion of script in question is:
if (dlg.symbol.bedding.value) {
var myLine = stGroup.pathItems.add();
myLine.stroked = true;
myLine.setEntirePath([[posx,posy],[posx+3,posy]]);
myLine.strokeWidth = .75;
var myLine = stGroup.pathItems.add();
myLine.setEntirePath([[posx,posy - 6.75],[posx,posy + 6.75]]);
myLine.stroked = true;
myLine.strokeWidth = .75;
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Thanks! That worked. For future reference, here's the modified section of script:
if (dlg.symbol.bedding.value) {
var myLine = stGroup.pathItems.add();
myLine.stroked = true;
myLine.setEntirePath([[posx,posy],[posx+3,posy]]);
myLine.strokeWidth = .75;
var myLine = stGroup.pathItems.add();
myLine.setEntirePath([[posx,posy - 6.75],[posx,posy + 6.75]]);
myLine.stroked = true;
myLine.strokeWidth = .75;
mapDoc.theOrigin = mapDoc.rulerOrigin;
mapDoc.rulerOrigin = [posx,posy];
stGroup.rotate(-azi, undefined,undefined,undefined,undefined,Transformation.DOCUMENTORIGIN);
mapDoc.rulerOrigin = mapDoc.theOrigin;
Another parameter in the rotate method to specify a rotation point would be nice. Still, this works just fine, so no complaints from me.

3D rotate around a circle preset ae6

Hello thanks for looking in..
I am messing with the (3D rotate around a circle) preset in AE6 and if you notice that the Browse Preset feature shows the 3D text completing a circle.. Yet, When I create a text layer, apply the preset effect there is a gap from the end of my last word typed to the start of the word typed.
IE: TV Bug TV Bug TV Bug TV Bug (space) beginning of TV Bug instead of looking as the preset does in Browse Presets. TV Bug in a complete circle and spaced evenly.
I hope this is making sense...I want the "g" in Bug to be spaced as a contiunued circle, so that Last "g" in Bug should butt up to the first "T" in TV. As it stands now I type it out and apply the preset and there is a huge space between the last "g" in Bug and the first "T" in TV.
What do I need to mess with too get the ends to meet?
I added a couple of pics to help describe:
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Thanks again
NC

RG thanks again for hopping in here. You are a great help and I am thankful to have you perusing these forums. I did get it to work. Although I do have a question or two about adding one keyframe to create a seemless loop.
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2. The other thing is the effect on that goes from one speed and slows to a stop and then of course starts again when going back to the beginning. I used Ease In and Ease out however I do not have control over the speed. IE: One speed throughout... Any suggestions on that one RG?
Regards
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How to make a still picture rotate around a vertical axis ?

H there,
Can I know how do I make a still picture rotate around a vertical axis ?
Thanks

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 ?
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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!
I applied the filter to the first clip, and set it so that it went from -360 to 360 in Y axis rotation. I then copied that clip and used Command -V to apply the same effect to the next to clips via paste attributes, UNCHECKING the Scale Attribute Times so that the spinning would slow down as the clips lengthened.
Lastly, I changed the last keyframe in the last clip to a "Smooth" , and added head and tail trim to the entire effect so the bars would start static, spin and the end static.
Like I say, it's far from perfect but may either point you toward a solution or trigger ideas of your own.
MTD

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Works like a charm. Just took most of my day trying to figure it out. lol.. But thats how you learn I guess.
Thanks for the reply!

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Measuring power at two different point (single phase)

Hi all,
I am new user of LabVIEW 2013 with electrical power suite.
May i know how to measure two different point of single phase system using the same VI such as in DAQ power and energy example?
As I notice that there are several type of wiring available. Is only one voltage and one current availabe during 1 ph voltage and 1 current selection. Thus, when I select 3ph voltage and 2 current, the value I obtain is not seem to be true.
From the figure attached, I want to measure the voltage at current at the solar/PV to obtain the power value. Other than that, I also need to measure the voltage and current at the load such as water heater. This is a single phase configuration network.
(2 voltage and 2 current measurement at single phase)
Hope for guidance.

Hi Lewis,
Here attached the file.
Actually I wanted to measure power two different point in a single phase system as shown in the first attachement.
Since, there is example in power quality measurement(DAQ) as shown in the second attachment.
since there is two measuring point in my measurement. May i know how to obtain two measurement voltage at the same time in DAQ?
Hope for guidance.
Attachments:
Two measuremernt point (single phase).png ‏7 KB
power & energy measurement.jpg ‏172 KB

Rotation around a different point

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