Tina,
Structure it like:
tranTG - (for locating the object in the world)
|
scaleTG - (for adjusting it's size)
|
Shape3D - (the object itself)
ie:
// set up your scaling and translating
Shape3D s3d = // create the shape
scaleTG.addChild(s3d);
tranTG.addChild(scaleTG);
- John Wright
Starfire Research
Tina Manoharan Valappil wrote:
>
> Hello Lee & John ,
>
> Actually what I did first was translate, scale, inverse translate
> on the same Transform3D, but now u have told me that I should
> have 3 seperate ones. But I am not sure why we have to do like
> that please do tell me.
>
> But still it doesnt work !!
>
> This is my scenegraph:
> --------------------------------------------------------------
>
> <SimpleUniverse> - <VPTrans/Avatar start point (0.0, 0.5, 3.0)>
> |
> <worldBG>
> |
> <worldTG> this is the world start point (0.0, 0.0, 0.0)
> |
> <pickBG>
> |
> <objBG> detachable, under which I have my loaded VRML obj
> |
> <objTG> inserted 1 unit in front of the Avatar
> |
> <BG> Bg from loading e.g. scene.getSceneGroup()
> |
> <VRML loaded obj>
>
> This is how I inserted the object 1 unit in front of the user:
> -----------------------------------------------------------
>
> Transform3D vpTransTransform = new Transform3D();
> vpTrans.getTransform(vpTransTransform);
>
> Point3d finalPoint = new Point3d();
> vpTransTransform.transform(new Point3d(0,0,-1), finalPoint);
> // 1 unit(mt) in front of user
> Vector3d finalVector = new Vector3d();
> finalVector.set(finalPoint);
>
> Transform3D objFinalTrans = new Transform3D();
> objFinalTrans.setTranslation(finalVector);
>
> objTG.setTransform(objFinalTrans);
>
> Then when the user inputs scale value say (2.0, 3.0, 1.0)
> I am applying the scale like this:
> ----------------------------------------------------------
>
> // original transform
> Transform3D originalTrans = new Transform3D();
> objTG.getTransform(originalTrans);
>
> // first translate the object to the origin (0,0,0)
> Vector3d translateVec = new Vector3d(0.0, 0.0, 0.0);
> Transform3D translateTrans = new Transform3D();
> translateTrans.setTranslation(translateVec);
>
> // then scale the object
> Vector3d scaleVec = new Vector3d(xScale, yScale, zScale);
> Transform3D scaleTrans = new Transform3D();
> scaleTrans.setScale(scaleVec);
>
> // then translate back to the original point
> Vector3d translateVec2 = new Vector3d();
> originalTrans.get(translateVec2);
> Transform3D translateTrans2 = new Transform3D();
> translateTrans2.setTranslation(translateVec2);
>
> // final transform = [original]*[translate]*[scale]*[translate2]
> Transform3D finalTrans = new Transform3D();
> finalTrans.mul(originalTrans);
> finalTrans.mul(translateTrans);
> finalTrans.mul(scaleTrans);
> finalTrans.mul(translateTrans2);
>
> objTG.setTransform(finalTrans);
>
> But there is something funny when I increase the size say
> change the scale from (0.1,0.1,0.1) to say (0.8,0.8,0.8) then
> the object becomes smaller and also moves somewhere else !!
>
> Thanks for your help
>
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