Thanks Uma & Marco,
I am now using 1.2b. Being able to set a subsection of the array to use was vital,
although
I have had to make a few compromises such as resorting to using singleton triangles
rather
than strips.
I find the GeometryUpdater interface callback quite bizarre to use. I have looked at
the
example at:
http://www.java.sun.com/products/java-media/3D/1_2_api_beta/changes/geometry_ref.html
Is this the best way of using it and if so, how do you overcome the restriction of only
using final local variabes?
Many thanks,
Duncan
-----Original Message-----
From: Uma Sabada [SMTP:[EMAIL PROTECTED]]
Sent: 01 May 2000 17:56
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: Re: [JAVA3D] Changing the length of strips & GeometryArrays
There are new APIs in 1.2 that allows you to set a bigger
GeometryArray and use only part of it.
For Copy case:
GeometryArray::setInitialVertexIndex()
GeometryArray::setValidVertexCount()
For By Reference Case:
GeometryArray::setInitialColorIndex()
GeometryArray::setInitialCoordIndex()
GeometryArray::setInitialNormalIndex()
GeometryArray::setInitialTexCoordIndex()
GeometryArray::setValidVertexCount()
-Uma
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>From [EMAIL PROTECTED] Sat Apr 29 08:33:16 2000
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Date: Sat, 29 Apr 2000 17:36:58 +0200
From: Marco Lohse <[EMAIL PROTECTED]>
Subject: Re: [JAVA3D] Changing the length of strips & GeometryArrays
To: [EMAIL PROTECTED]
Hi Duncan,
I am thinking about two things which might help you:
1) try using geometry by reference as introduced with J3D 1.2. Then you
could use System.arraycopy(..) to recreate things which should be very fast.
2) some (possible urgly) fix would be: since you said only 3% of your data
changes, just create the geometry with an upper bound of your number of
vertices, then set all unused strips to some dummy point like (0,0,0) (so
they won?t be rendered as triangles), later just change things in the
geometry array which is passed by reference (see above).
Maybe, another thing would be to use immediate mode rendering,...
Regards,
Marco.
----- Original Message -----
From: D.A. Woods <[EMAIL PROTECTED]>
> Hi there,
>
> I need to lengthen, shorten, add & remove triangle strips at run
> time.
>
> Does anyone have any idea how to do this efficently or
> even approach this problem?
>
> It seems to me that the triangleStripArrays have pre-declared
> length and strip lengths so a whole new array has to be created. This is
> a problem beacuse I only want to change ~3% of the data each time so is
> there a fast way of doing this from another array that doesn't require all
> the data to be physically copied?
>
> Even a fast way of changing the array length would be a great
> help.
>
> Please help or tell me it can't be done,
>
> Thanks,
> Duncan
>
>
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