Uma is having problem posting message to the alias. Here is her response
to the AlternateAppearance question:
The original intent of AlternateAppearance is to use it for highlight - such as
in response to an user action. Alternate appearance is not designed to
dynamically set the appearance at a large group level so as to override the
individual appearance on a large number of Shape3Ds. Scoping the alternate
appearance at a very high group level (with several Shape3Ds ) and/or
detaching/attaching alternate appearance every frame and/or changing the
transform above the alternate appearance every frame would result in
degradation in performance (as would be the case with lights/fog/modelclip).
-Uma
Java3D Team
> X-Accept-Language: en,ja,zh-CN,zh-TW
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> Date: Fri, 2 Feb 2001 16:57:28 -0800
> From: John Sutter <[EMAIL PROTECTED]>
> Subject: Re: [JAVA3D] Performance of AlternateAppearance
> To: [EMAIL PROTECTED]
>
> I get the feeling that some bad assumptions were made about how
> many nodes will actually be under an AlternateAppearance node.
> I think alot of time is being spent on juggling arrays from some
> shot in the dark investigations. AlternateAppearances seem to be
> treated similar to 'small quantity' objects like lights. Things
> get slow pretty quickly on a model of any complexity for us..
>
> -j
>
>
> Yuri Nikishkov wrote:
> >
> > Did anybody try setting AlternateAppearance on a large scene?
> >
> > I have the model that has about 200 groups and 11000 shapes total. The
> > rendering time (in software) is still not bad, less than 0.4 sec per frame,
> > but when I try to set AlternateAppearance that colors the whole model (with
> > my top branch group as a scope), it takes about 2 seconds! And moreover, it
> > takes about twice this time, 4 seconds, to remove it. Profiling indicates
> > that most of the time (75%) is spent in Java3D RenderUpdateStructure thread.
> > Is there something that I can do to improve performance?
> >
> > Yuri Nikishkov
> > Software Engineer, Graphics Technology
> > Alventive, Inc. - 678.202.2349
> >
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>
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