your problem is backside culling, and depending on how you defined the
points (clockwise/counterclockwise) the back side may be facing the camera.
try the folowing in your Appearance node, if everything looks alright, then
that's your problem. You will pay a performance price for not culling faces,
but you'll know if this is the problem.
Appearance appearance = new Appearance();
PolygonAttributes pa = new PolygonAttributes();
pa.setCullFace(PolygonAttributes.CULL_NONE);
appearance.setPolygonAttributes(pa);
-----Original Message-----
From: Boggavarapu V S N Murthy [mailto:[EMAIL PROTECTED]]
Sent: Saturday, September 25, 1999 7:07 AM
To: [EMAIL PROTECTED]
Subject: [JAVA3D] problem with IndexedQuadArray
I am working with a robot in vrml-eai.
recently i heard about java3d and i switched over to java3d since the
interface between a 3dworld and java applet is more clear here.
forget all these.
Now i started building the robot with IndexedQuadArray as oppsed to
IndexedFaceSet. First of all I created a cube . but when i am rotating it
using pickingbehaviour all face are not appearing correctly.
some faces are rendered at a particular position only.i am a newb.
please help me.
i am enclosing the source.
B V S N MURTHY
**************************************************************
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.event.*;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.*;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.media.j3d.Leaf.*;
import javax.vecmath.*;
import com.sun.j3d.utils.behaviors.picking.*;
import javax.media.j3d.IndexedGeometryArray.*;
public class Quad1 extends Applet {
public void init() {
setLayout(new BorderLayout());
Canvas3D c = new Canvas3D(null);
add("Center", c);
BranchGroup scene = createSceneGraph(c);
SimpleUniverse u = new SimpleUniverse(c);
u.getViewingPlatform().setNominalViewingTransform();
u.addBranchGraph(scene);
}
public BranchGroup createSceneGraph(Canvas3D canvas) {
BranchGroup objRoot = new BranchGroup();
createLights (objRoot,canvas);
Transform3D spin = new Transform3D();
Transform3D tempspin = new Transform3D();
Appearance earthApp = new Appearance();
Color3f black = new Color3f(0.0f, 0.0f, 0.0f);
Color3f white = new Color3f(1.0f, 1.0f, 1.0f);
earthApp.setMaterial(new Material(white, black, white, black,
1.0f));
spin.rotY(Math.PI/4.0d);
tempspin.rotX(Math.PI/5.0d);
spin.mul(tempspin);
TransformGroup objTrans = new TransformGroup(spin);
objRoot.addChild(objTrans);
int[] ii = new int[4];
for(int i=0;i<4;i++)ii[i]=i;
IndexedQuadArray bb = new
IndexedQuadArray(8,IndexedQuadArray.COORDINATES |
IndexedQuadArray.COLOR_3,24);
bb.setCoordinate(0, new Point3f(0.0f, 0.0f, 0.0f));
bb.setCoordinate(1, new Point3f(0.4f, 0.0f, 0.0f));
bb.setCoordinate(2, new Point3f(0.4f, 0.4f, 0.0f));
bb.setCoordinate(3, new Point3f(0.0f, 0.4f, 0.0f));
bb.setCoordinate(4, new Point3f(0.0f, 0.0f, 0.4f));
bb.setCoordinate(5, new Point3f(0.4f, 0.0f, 0.4f));
bb.setCoordinate(6, new Point3f(0.4f, 0.4f, 0.4f));
bb.setCoordinate(7, new Point3f(0.0f, 0.4f, 0.4f));
bb.setCoordinateIndex(0,0);
bb.setCoordinateIndex(1,1);
bb.setCoordinateIndex(2,2);
bb.setCoordinateIndex(3,3);
bb.setCoordinateIndex(4,2);
bb.setCoordinateIndex(5,1);
bb.setCoordinateIndex(6,5);
bb.setCoordinateIndex(7,6);
bb.setCoordinateIndex(8,4);
bb.setCoordinateIndex(9,5);
bb.setCoordinateIndex(10,6);
bb.setCoordinateIndex(11,7);
bb.setCoordinateIndex(12,2);
bb.setCoordinateIndex(13,6);
bb.setCoordinateIndex(14,7);
bb.setCoordinateIndex(15,3);
bb.setCoordinateIndex(16,3);
bb.setCoordinateIndex(17,0);
bb.setCoordinateIndex(18,4);
bb.setCoordinateIndex(19,7);
bb.setCoordinateIndex(20,0);
bb.setCoordinateIndex(21,1);
bb.setCoordinateIndex(22,5);
bb.setCoordinateIndex(23,4);
bb.setColor(0,new Color3f(1.0f,0.0f,1.0f));
bb.setColor(4,new Color3f(1.0f,0.0f,1.0f));
bb.setColor(2,new Color3f(1.0f,1.0f,0.0f));
bb.setColor(1,new Color3f(0.0f,1.0f,1.0f));
Shape3D ss = new Shape3D(bb);
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
objTrans.setCapability(TransformGroup.ENABLE_PICK_REPORTING);
objTrans.addChild(ss);
objRoot.compile();
return objRoot;
}
private void createLights(BranchGroup graphRoot,Canvas3D canvas) {
// Create a bounds for the light source influence
BoundingSphere bounds = new BoundingSphere(new
Point3d(0.0,0.0,0.0), 100.0);
// Set up the global, ambient light
Color3f alColor = new Color3f(0.2f, 0.2f, 0.2f);
AmbientLight aLgt = new AmbientLight(alColor);
aLgt.setInfluencingBounds(bounds);
graphRoot.addChild(aLgt);
// Set up the directional (infinite) light source
Color3f lColor1 = new Color3f(0.9f, 0.9f, 0.9f);
Vector3f lDir1 = new Vector3f(1.0f, 1.0f, -1.0f);
DirectionalLight lgt1 = new DirectionalLight(lColor1, lDir1);
lgt1.setInfluencingBounds(bounds);
PickRotateBehavior behavior = new PickRotateBehavior(graphRoot,
canvas, bounds,
PickObject.USE_BOUNDS);
graphRoot.addChild(behavior);
PickZoomBehavior behavior2 = new PickZoomBehavior(graphRoot, canvas,
bounds,
PickObject.USE_BOUNDS);
graphRoot.addChild(behavior2);
PickTranslateBehavior behavior3 = new PickTranslateBehavior(graphRoot,
canvas, bounds,
PickObject.USE_BOUNDS);
graphRoot.addChild(behavior3);
graphRoot.addChild(lgt1);
}
}
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