Since you can create your own appearance and use that appearance to
construct a Sphere, you have full control over the capability bits
that are set in the appearance.
--
Kevin Rushforth
Java 3D Team
Sun Microsystems
[EMAIL PROTECTED]
>Date: Tue, 14 Sep 1999 01:49:53 -0700
>From: Jon Barrilleaux <[EMAIL PROTECTED]>
>Subject: Re: [JAVA3D] Changing Sphere Color
>To: [EMAIL PROTECTED]
>
>It has been a while since I figured out exactly why this is so with
>the Sun utility shapes but I think it goes something like this...
>
>Although the ability to access the appearance is set the ability to
>access the appearance material is not. And, you can't set the ability
>to access the material because the shapes are internally compiled. I
>also recall that the fact that appearance is set by reference and not
>by value (a copy) also complicates matters. Welcome to Java 3D.
>
>Bottom line is you have to effectively use/create a new material and a
>new appearance each time you want to change the color.
>
>--jon
>
>> Date: Mon, 13 Sep 1999 08:48:04 -0400
>> From: Bob Gray <[EMAIL PROTECTED]>
>> Subject: Changing Sphere Color
>>
>> Why is nothing simple???
>>
>> I define MySphere as an extension of Sphere.
>> I add it to my scene graph.
>>
>> MySphere theSphere = new MySphere();
>> theSphere.setAppearance(createAppearanceProton());
>> theSphere.setCapability(Shape3D.ALLOW_APPEARANCE_READ);
>> theSphere.setCapability(Shape3D.ALLOW_APPEARANCE_WRITE);
>> objPSize.addChild(theSphere);
>>
>> Note the ALLOW_APPEARANCE_READ capability....
>>
>> After the scene is compiled and active, I want to change the sphere's
>> color. So I get the appearance of the sphere by
>>
>> Appearance PA = theApp.theSphere.getAppearance();
>> Material theMaterial = PA.getMaterial();
>> theMaterial.setDiffuseColor(red, green, blue);
>>
>> But this fails with a
>> "Shape3D: no capability to get appearance"
>> exception.
>>
>> So how do you set the capability to read (and write) the
>> appearance of a Sphere object? Or is there some other
>> problem which is preventing me from doing this?
>>
>> Bob Gray
>
>--
>____________________ Peculiar Technologies ____________________
>Jon Barrilleaux 3800 Lake Shore Ave. Purveyors of
>[EMAIL PROTECTED] Oakland, CA 94610 Alternate Reality
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>510.444.0231 fax www.augsim.com and 3D Solutions
>
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