| A new book features a demonstraion of the
| interactive "picking" of objects in a 3d Scene
| created from a VRML data file, and all the
| source code and data files are
| ___ free ___ and are freely available.
|
| The VRML file is read and rendered, and
| with your mouse you can "pick" objects in
| the scene and it has an interactive
| representation of the Java3d Scenegraph
| that allows you to expand and collapse branches
| of the Scenegraph and examine the contents
| of the nodes of the scenegraph tree.
|
| It uses the popular, portable Sun VRML Loaders.
|
|
|| Picking of VRML objects with your mouse is
|| demonstrated in a new book, _ Java _ 3D _ Programming _,
|| by Daniel Selman ...
||
|| The source code is avaible for free. [ links below ]
|
http://www.frontiernet.net/~imaging/games_with_java3d.html
http://www.frontiernet.net/~imaging/sourcecode/VrmlPickingTest.java
http://www.frontiernet.net/~imaging/sc_vrml_picking_with_java3d.jpg
http://www.manning.com/selman/selman_source.zip
|
[ posted to java3d-interest list March 4, 2002 ]
|
http://archives.java.sun.com/cgi-bin/wa?A2=ind0203&L=java3d-interest&P=6204
[ in reply to comp.lang.java.3d post on March 19, 2002 ]:
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?
I'm not sure but I've usd the pick-ing code
from Selman's book and it worked properly,
the code is freely available ( see above ).
Have you tried that yet ?
Start with something that works, like this:
VRML & Java3d for Games on the Web & beyond, & Picking.
--------------------------------------------
http://www.frontiernet.net/~imaging/games_with_java3d.html
http://www.frontiernet.net/~imaging/sourcecode/VrmlPickingTest.java
-- Paul, Java Developer & Web Animator
--------------------------------------
"Imaging the Imagined: Modeling with Math & a Keyboard"
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