If Selman's book doesn't satisify, does Palmer's ?
Picking from Palmer's book "Essential Java 3D Fast"
|
| public void updateScene(int xpos, int ypos)
| {
| PickResult pickResult = null;
| Primitive pickedShape = null;
|
|
pickCanvas.setShapeLocation(xpos,ypos);
|
|
pickResult = pickCanvas.pickClosest();
|
|
if ( pickResult != null)
|
pickedShape = (Primitive)
|
pickResult.getNode( PickResult.PRIMITIVE);
|
if (pickedShape != null)
|
System.out.println( "Picked the " +
|
pickedShape.getUserData());
|
else
|
System.out.println("Picked nothing");
| }
|
http://www.eimc.brad.ac.uk/~ijpalmer/Java3Dfast/Source/SimplePickBehaviour.java
http://www.eimc.brad.ac.uk/~ijpalmer/Java3Dfast/Source/html/SimplePick.html
http://www.eimc.brad.ac.uk/~ijpalmer/Java3Dfast/Source/
http://www.eimc.brad.ac.uk/~ijpalmer/Java3Dfast/Source/Java3Dsource.zip
The above is a hard coded examples,
ie. it's not reading in VRML, but
presumably the two methods could be merged,
an exercise left to the reader.
| yeah i know about the _Java _ 3D _ Programming _
| but it does not work with my wrl file 'cos
| no objects are referenced, only geometries
| so i cannot use hashtable!!!!
|
| do you have another idea?
|
| Sébastien Chailan
| Serlog - Branche Industrie
Just the one above, I'm not sure about the new
xj3d loaders ( they also read in VRML ).
Just an idea: Would adding unique DEF names
help by adding a unique node assosiated with
each geometry you might be picking ?
geofuny wrote:
> here is my script:(the question is bottom)
>
>
>
> public class PickFleet extends PickMouseBehavior {
>
> /** cuurent fleet object*/
> private Fleet fleet;
>
> /** Creates new PickShape
> * @param canvas the current canvas
> where is drawing the scene graph of fleet object
> * @param root the current scene graph of the fleet object
> * @param bounds the current bounds of the fleet object
> * @param fl the current fleet object
> */
> public PickFleet(Canvas3D canvas, BranchGroup root, Bounds bounds,
> Fleet fl) {
> //constructs a new PickMouseBehavior
> super(canvas, root, bounds);
>
> //get the current fleet object
> fleet = fl;
>
> //limitation picking bound
> this.setSchedulingBounds(bounds);
>
> //PickFleet object added to the scene graph of the fleet
> object
> root.addChild(this);
>
> //bounds picking mode with a tolerance of picking
> pickCanvas.setMode(PickTool.BOUNDS);
> pickCanvas.setTolerance(0.1f);
>
> }
>
> /**proceed to get the VRML object picked
> * @param xPos the x component of the picking mouse
> * @param yPos the y component of the picking mouse
> */
> public void updateScene(int xPos, int yPos) {
>
> PickResult pickResult = null;
> BranchGroup bg=null;
> //get the coordinates of the picking mouse into the canvas
> pickCanvas.setShapeLocation(xPos, yPos);
> //get the closest object picked
> pickResult = pickCanvas.pickClosest();
>
> if (pickResult != null) {
> //get the branchgroup object picked
> bg = (BranchGroup)pickResult.getNode(PickResult.BRANCH_GROUP);
> ...
> }
> }
> }
>
> when i get the bg variable, his value is null when i pick the VRML
> object in the canvas.
>
> The objects are loading from VRML object and the result is an
> branchgroup node. That's the reason why i use a
> PickResult.BRANCH_GROUP.
>
> What's wrong with that?
" Games with VRML & Java3d " with simple picking example.
---------------------------
http://www.frontiernet.net/~imaging/games_with_java3d.html
-- Paul, Java Developer & Web Animator
--------------------------------------
"Imaging the Imagined: Modeling with Math & a Keyboard"
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