Thank you, Carlos,
I tried what you said here. But the situation hasn't changed.
I guess, normals for Cylinder and Cone are generated by default.
Frustrated with this.
Mingtian Ni
On Mon, 28 Oct 2002, Carlos D Correa wrote:
> Hi,
>
> I think this problem can be solved by setting the appropriate normals
> for your geometry,
>
> When creating cylinders and other figures, send a GENERATE_NORMALS flag
> in the constructor...
> it looks something like: new Cylinder(radius, height,
> Cylinder.GENERATE_NORMALS, appearance);
> Additionally, if you don't need them to be transparent you won't need
> the lines:
>
> TransparencyAttributes ta = new TransparencyAttributes();
> app.setTransparencyAttributes(ta);
>
>
> Carlos
>
> Mingtian Ni wrote:
>
> >Hi there,
> >I am developing an application with java3d.
> >It worked very good so far. However, I found that
> >whatever I created in the scene graph looked transparent.
> >An example is given in the attached image where the cone
> >is supposed to block the cylinder. But we can still see
> >the cylinder through the top cone.
> >What happens there? I didn't turn on the transparency attribute.
> >I has been struggling with this for quite a few days.
> >Some body can tell me?
> >Any response is appreciated! To make the question clearer, I attach
> >the code I am using here. Sorry for the long email.
> >
> >Mingtian Ni
> >
> >This function for creating the 3d axises is as follows:
> > private TransformGroup createAxises(float width, float height, float
> >depth)
> > {
> > TransformGroup root = new TransformGroup();
> >
> > // Create appearence.
> > Appearance app = new Appearance();
> > Material mm = new Material();
> > mm.setLightingEnable(true);
> > mm.setAmbientColor(0.0f, 1.0f, 0.0f);
> > mm.setDiffuseColor(0.0f, 1.0f, 0.0f);
> > mm.setSpecularColor(0.0f, 1.0f, 0.0f);
> > mm.setShininess(100.0f);
> > app.setMaterial(mm);
> > TransparencyAttributes ta = new TransparencyAttributes();
> > app.setTransparencyAttributes(ta);
> > RenderingAttributes ra = new RenderingAttributes();
> > ra.setAlphaTestFunction(RenderingAttributes.GREATER);
> > app.setRenderingAttributes(ra);
> >
> > Cylinder cy;
> > Cone arrow;
> > TransformGroup axisGroup, cyGroup, arrowGroup, labelGroup;
> > Transform3D t;
> > Shape3D sh;
> >
> > // Create y axis.
> > axisGroup = new TransformGroup();
> >
> > cyGroup = new TransformGroup();
> > t = new Transform3D();
> > t.setTranslation(new Vector3f(0.0f, height/2.0f, 0.0f));
> > cyGroup.setTransform(t);
> >
> > cy = new Cylinder(m_AXISRADIUS, height, app);
> > cyGroup.addChild(cy);
> > axisGroup.addChild(cyGroup);
> >
> > arrowGroup = new TransformGroup();
> > arrowGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
> > t = new Transform3D();
> > t.setTranslation(new Vector3f(0.0f, height + m_ARROWLEN/2.0f,
> >0.0f));
> > arrowGroup.setTransform(t);
> >
> > arrow = new Cone(m_ARROWRADIUS, m_ARROWLEN, app);
> > arrowGroup.addChild(arrow);
> > axisGroup.addChild(arrowGroup);
> >
> > labelGroup = new TransformGroup();
> > labelGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
> > t = new Transform3D();
> > t.setTranslation(new Vector3f(0.0f, height + m_ARROWLEN,
> >0.0f));
> > labelGroup.setTransform(t);
> >
> > sh = new Shape3D(getRaster("2nd Col"));
> > labelGroup.addChild(sh);
> >
> > axisGroup.addChild(labelGroup);
> >
> > root.addChild(axisGroup);
> >
> > // Create x axis.
> > axisGroup = new TransformGroup();
> > axisGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
> > t = new Transform3D();
> > t.setRotation(new AxisAngle4d(0.0, 0.0, 1.0, -Math.PI/2.0));
> > axisGroup.setTransform(t);
> >
> > cyGroup = new TransformGroup();
> > t = new Transform3D();
> > t.setTranslation(new Vector3f(0.0f, width/2.0f, 0.0f));
> > cyGroup.setTransform(t);
> >
> > cy = new Cylinder(m_AXISRADIUS, width, app);
> > cyGroup.addChild(cy);
> > axisGroup.addChild(cyGroup);
> >
> > arrowGroup = new TransformGroup();
> > arrowGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
> > t = new Transform3D();
> > t.setTranslation(new Vector3f(0.0f, width + m_ARROWLEN/2.0f,
> >0.0f));
> > arrowGroup.setTransform(t);
> >
> > arrow = new Cone(m_ARROWRADIUS, m_ARROWLEN, app);
> > arrowGroup.addChild(arrow);
> >
> > axisGroup.addChild(arrowGroup);
> >
> > labelGroup = new TransformGroup();
> > labelGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
> > t = new Transform3D();
> > t.setTranslation(new Vector3f(0.0f, width + m_ARROWLEN, 0.0f));
> > labelGroup.setTransform(t);
> >
> > sh = new Shape3D(getRaster("1st Col"));
> > labelGroup.addChild(sh);
> >
> > axisGroup.addChild(labelGroup);
> >
> > root.addChild(axisGroup);
> >
> > // Create z axis.
> > axisGroup = new TransformGroup();
> > axisGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
> > t = new Transform3D();
> > t.setRotation(new AxisAngle4d(1.0, 0.0, 0.0, Math.PI/2.0));
> > axisGroup.setTransform(t);
> >
> > cyGroup = new TransformGroup();
> > t = new Transform3D();
> > t.setTranslation(new Vector3f(0.0f, depth/2.0f, 0.0f));
> > cyGroup.setTransform(t);
> >
> > cy = new Cylinder(m_AXISRADIUS, depth, app);
> > cyGroup.addChild(cy);
> > axisGroup.addChild(cyGroup);
> >
> > arrowGroup = new TransformGroup();
> > arrowGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
> > t = new Transform3D();
> > t.setTranslation(new Vector3f(0.0f, depth + m_ARROWLEN/2.0f,
> >0.0f));
> > arrowGroup.setTransform(t);
> >
> > arrow = new Cone(m_ARROWRADIUS, m_ARROWLEN, app);
> > arrowGroup.addChild(arrow);
> >
> > axisGroup.addChild(arrowGroup);
> >
> > labelGroup = new TransformGroup();
> > labelGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
> > t = new Transform3D();
> > t.setTranslation(new Vector3f(0.0f, depth + m_ARROWLEN, 0.0f));
> > labelGroup.setTransform(t);
> >
> > sh = new Shape3D(getRaster("DN"));
> > labelGroup.addChild(sh);
> >
> > axisGroup.addChild(labelGroup);
> >
> > root.addChild(axisGroup);
> >
> > // Create the view box.
> > app = new Appearance();
> > ColoringAttributes ca = new ColoringAttributes(1.0f, 1.0f,
> >1.0f, ColoringAttributes.SHADE_FLAT);
> > app.setColoringAttributes(ca);
> > ra = new RenderingAttributes();
> > ra.setAlphaTestFunction(RenderingAttributes.GREATER);
> > app.setRenderingAttributes(ra);
> >
> > float[] vts =
> > { 0.0f, 0.0f, 0.0f,
> > width, 0.0f, 0.0f,
> > width, height, 0.0f,
> > 0.0f, height, 0.0f,
> > 0.0f, 0.0f, depth,
> > width, 0.0f, depth,
> > width, height, depth,
> > 0.0f, height, depth
> > };
> > int[] indices =
> > { 0, 1, 2, 3, 0,
> > 4, 5, 6, 7, 4,
> > 0, 4,
> > 1, 5,
> > 2, 6,
> > 3, 7
> > };
> > int[] strips = {5, 5, 2, 2, 2, 2};
> >
> > IndexedLineStripArray box = new IndexedLineStripArray(8,
> >
> >IndexedLineStripArray.COORDINATES|IndexedTriangleStripArray.BY_REFERENCE,
> > indices.length,
> > strips);
> > box.setCoordRefFloat(vts);
> > box.setCoordinateIndices(0, indices);
> >
> > sh = new Shape3D(box, app);
> > root.addChild(sh);
> >
> > return root;
> > }
> >
> >The function for creating universe is as follows:
> > private SimpleUniverse createUniverse()
> > {
> > // Create a Canvas3D.
> > GraphicsConfigTemplate3D gct3D = new
> >GraphicsConfigTemplate3D();
> > gct3D.setSceneAntialiasing(GraphicsConfigTemplate.PREFERRED);
> > GraphicsConfiguration gc =
>
>>GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getBestConfiguration(gct3D);
> > Canvas3D canvas3D = new Canvas3D(gc);
> > add(canvas3D, BorderLayout.CENTER);
> >
> > // Create a Universe.
> > SimpleUniverse universe = new SimpleUniverse(canvas3D);
> >
> > // Set initial transform to the ViewingPlatform.
> > ViewingPlatform viewingPlatform =
> >universe.getViewingPlatform();
> > viewingPlatform.setNominalViewingTransform();
> >
> >viewingPlatform.getViewPlatform().setViewAttachPolicy(View.NOMINAL_HEAD);
> > Transform3D transform = new Transform3D();
> >
>
>>viewingPlatform.getMultiTransformGroup().getTransformGroup(0).getTransform(transform);
> > Transform3D t = new Transform3D();
> > t.setTranslation(new Vector3f(0.0f, 0.0f, m_viewWidth/2.0f));
> > transform.mul(t);
> > t.setRotation(new AxisAngle4d(1.0, 0.0, 0.0, Math.PI/4.0));
> > transform.mul(t);
> >
>
>>viewingPlatform.getMultiTransformGroup().getTransformGroup(0).setTransform(transform);
> >
> > // add orbit behavior to ViewingPlatform
> > m_orbitBehavior = new OrbitBehavior(canvas3D,
> >OrbitBehavior.REVERSE_ALL|OrbitBehavior.STOP_ZOOM);
> > BoundingSphere bounds = new BoundingSphere(new Point3d(0.0,
> >0.0, 0.0), Double.MAX_VALUE);
> > m_orbitBehavior.setSchedulingBounds(bounds);
> > m_orbitBehavior.setRotationCenter(new Point3d(m_viewWidth/2.0,
> >m_viewHeight/2.0, m_viewDepth/2.0));
> > viewingPlatform.setViewPlatformBehavior(m_orbitBehavior);
> >
> > View view = universe.getViewer().getView();
> > view.setFrontClipPolicy(View.VIRTUAL_EYE);
> > view.setBackClipPolicy(View.VIRTUAL_EYE);
> > view.setBackClipDistance(2 * (m_viewWidth + m_viewHeight +
> >m_viewDepth));
> > view.setFrontClipDistance(1.0e-5);
> >
> > view.setWindowEyepointPolicy(View.RELATIVE_TO_WINDOW);
> > view.setWindowResizePolicy(View.VIRTUAL_WORLD);
> > view.setWindowMovementPolicy(View.PHYSICAL_WORLD);
> >// view.setSceneAntialiasingEnable(true);
> >// view.setLocalEyeLightingEnable(true);
> >//System.out.println("window resize policy = " +
> >universe.getViewer().getView().getWindowResizePolicy());
> > return universe;
> > }
> >
> >
> > ------------------------------------------------------------------------
> >
> > <cid:part1.00020505.05020108@;netscape.com>
> >
>
>
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