This sounded reasonable, so I changed MySphere (which extends Sphere)
constructor
from
super(1.0f);
to
super(1.0f, Sphere.ENABLE_APPEARANCE_MODIFY, null);
But I now get
"Cannot do lighting without specifying normals on geometry object"
(And, yes, I do a setAppearance later, after MySphere is created but
before I compile the scene and make it active.)
*Now* what do I do to fix *this* problem? (All I want to do is change the
Sphere appearance (color)!
Bob Gray
-----Original Message-----
From: CAZOULAT Renaud CNET/DIH/REN
[mailto:[EMAIL PROTECTED]]
Sent: Monday, September 13, 1999 12:21 PM
To: [EMAIL PROTECTED]
Subject: Re: [JAVA3D] Changing Sphere Color
Hi,
> Why is nothing simple???
Ho Ho, nothing is simple in 3D even with java ;-))
The problem you have IS simple, but you do not look at the right object.
you must *not* set the capability bits to the sphere itself but rather
at the shape3D it contains (which in fact is kind of child (0) of child(0)
of the sphere group object : a sphere extends a primitive which extends a
group, ouf!!). Hopefully, there is a constructor which enables you
to specify that you want to modify (i.e. both read and write) later your
sphere appearance, so the flags ALLOW_APPEARANCE_READ|WRITE are set
automatically to the internal shape3d of the sphere at initialization time.
This flag is ENABLE_APPEARANCE_MODIFY (defined in class Primitive).
So you should build your sphere with:
new Sphere (radius, Sphere.ENABLE_APPEARANCE_MODIFY, null);
and it should work (I hope ;-))
sincerly
renaud
> 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
>
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