Nicolas Burtin writes:
> I am using Java3d (1.2) in order to programm a Doom-like for a study
> project. After some problems solved, I now have a big one.
> In order to shoot, I want to use a PositionInterpolator with a beam as
> target (LineArray). This LineArray is created in a Behavior responding
> to a Mouse MOUSE_PRESSED, put in a TransformGroup and then in a
> BranchGroup, and finally added to the live BG (objRoot...), since only a
> BG can be added to a live BG.
> My problem is that the PositionInterpolator whose target is the TG takes
> it from the position where I first set it (10,0,10 for ex) and put it in
> the origin (0,0,0); then the movement is executed...
> So, it seems to me that the translation part of the PositionInterpolator
> is not modifiable... I first though that the TG's one was used to set
> the object's position, but in reality it doesn't!
> I have tried many others situations (not in a behavior
>
> Do you have a miracle for me?
>
> //////////////////////////////////////////////////////////////////////
Possible Solution:
Try using PositionPathInterploter instead of a PositionInterpolator, this
will allow you to have the object move down any 3D path that you would
like, the only caveat is that you'll have to provide the cooordinates for
the begining (the gun) and the end (target) of the path.
Mark
> Part of my code:
>
>
> vpTrans.getTransform(transform);
> transform.get(rotation, translation);
>
> // beam's creation
> LineArray rayon = new LineArray(2, LineArray.COORDINATES |
> LineArray.COLOR_3);
> Point3d point= new Point3d(0.0d, 0.0d,-1.0d);
> rotation.transform(point);
> rayon.setCoordinate(0, new Point3d(0.0d, 0.0d, 0.0d) );
> rayon.setCoordinate(1, point );
> rayon.setColor(0, new Color3f(1.0f, 1.0f, 0.0f) );
> rayon.setColor(1, new Color3f(1.0f, 0.0f, 1.0f) );
>
> // position of the beam
> Transform3D tr= new Transform3D();
> tr.rotY(Math.PI/2.0f);
> transform.mul(tr);
>
> TransformGroup tgBalle= new TransformGroup(transform);
> tgBalle.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
>
> // alpha of the following PositionInterpolator
> Alpha alf= new Alpha();
> alf.setLoopCount(10);
> alf.setMode(Alpha.INCREASING_ENABLE);
> alf.setIncreasingAlphaDuration(5000);
> alf.setStartTime(System.currentTimeMillis());
>
> // interpolator with bounds
> PositionInterpolator posInter= new PositionInterpolator(alf, tgBalle,
> transform, 0.0f, 10.0f );
> BoundingSphere bouleP= new BoundingSphere( new Point3d(10.0f, 0.0f,
> 10.0f), 1000.0f);
> posInter.setSchedulingBounds(bouleP);
>
> // assemble scene graph
> tgBalle.addChild( new Shape3D(rayon) );
> BranchGroup bgBalle= new BranchGroup();
> bgBalle.addChild(posInter);
> bgBalle.addChild(tgBalle);
> objRoot.addChild(bgBalle);
>
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