another related java3d/portrayal question,
How are you supposed to remove an item from the display?
I was trying to use,
FieldPortrayal.setPortrayalForObject(java.lang.Object obj, null)
Which should remove the portrayal from the field?
However, this doesn't seem to change the display.
Sean Luke wrote:
> Michael, you don't want to replace the appearance of an object. That's
> what Shape3D.ALLOW_APPEARANCE_WRITE does. What you want to do is be
> able to do is change the Appearance's attributes itself, something like
> public CubePortrayal3D(Appearance appearance, boolean generateNormals,
> boolean generateTextureCoordinates, float scale)
> this.generateNormals = generateNormals;
> this.generateTextureCoordinates = generateTextureCoordinates;
> this.appearance = appearance;
> // changed here
> this.scale = scale;
> for(int i=0;i<scaledVerts.length;i++)
> scaledVerts[i] = verts[i]*scale;
> But that might not work, because when the portrayal creates the scene
> object, assigning it the Appearance, Java3D may *copy* the appearance,
> and so changing the appearance later on doesn't change the copy that's
> being used. You'll have to see for yourself to determine this. If it's
> the case that it doesn't work, then I have some other ideas.
> On Nov 14, 2006, at 9:41 AM, Michael Lees wrote:
>> I'm trying to vary the transparency of a cube during the simulation
>> I define the following....
>> public sim.portrayal3d.simple.CubePortrayal3D representation;
>> representation = new sim.portrayal3d.simple.CubePortrayal3D(colour,size)
>> And then attempt to change the transparency by...
>> I noticed that nothing was appearing, looked like the cubes had 0
>> Surrounding the setTransparency call with a try catch I realised the
>> follow exception was being thrown...
>> javax.media.j3d.CapabilityNotSetException: Appearance: no capability
>> to get transparencyAttributes
>> Looking into CubePortrayal3D.getModel I found the following...
>> 131: Shape3D localShape = new Shape3D(quadArray,appearance);
>> 132: localShape.setCapability(Shape3D.ALLOW_APPEARANCE_WRITE);
>> Which should allow you to change the appearance properties of the
>> However, is the problem that I'm calling getTransparencyAttributes()
>> when localShape.setCapability(Shape3D.ALLOW_APPEARANCE_READ); has not
>> been set?
>> Or I'm I going about this all the wrong way? How should I change the
>> transparency of a CubePortrayal3D (or more generally any Portrayal3D).
>> --Michael Lees
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