I would like to hear a word on the way to 0ptimize our
J3D scenes for j3f files. Specifically, if I crate
1(one) Appearance object and then set it into 2(two)
Shape3d objects, how many appearances will be be
stored in a j3f file? The same apply to
avax.media.j3d.Texture objets. If I created a single
javax.media.j3d.Texture object and then set it into 2
Appearance objects, how many texture maps will be
tored in j3f file?
The test I wrote earlier did not include any texture
maps. I just took a vrml file, removed all texture
tags by hands and loaded it into j3dfly using a loader
provided with this download. I can see that J3D scene
should contain twice as much information as my vrml
file. In addition to coordinates and texture
coordinates, it contains NORMALS and COLORS. But still
j3d contains it in a binary form and thus must be
smaller than vrml. I expected it to be twice the size
of a 3ds file (~300K). But 2.2M is a way to high.
Thank you for your help trying to clarify these
issues.
Boris
>For number 2, I have been down a similar road for the
j3f file format with
>obj files. One thing I forgot about was normals, that
j3f stores the normals
>and the obj files I was using did not. The one thing
I did learn also was
>that j3f files store texture maps internally, when
you realize that it also
>includes the texture maps inside it can cause the
size to be larger, this is
>something that may be relating to your problem. The
other thing is, when I
>compressed the texturemap(s) and obj files down in a
single zip file, and
>then compared them to a compressed j3f file, I
noticed that the j3f file was
>smaller in size then the obj texture map one.
>This was just my initial observation, I think there
is probably other ways to
>optimize the geometry and other properties inside of
java3d so that the
>output will also be optimized memory wise. I'm
currently examining the source
>code to the j3d fly through demo IO code to see how
it works so that my
>utility program can possibly optimize the output. But
I have to hold this off
>until I get some other issues settled with Java3D, I
want to get a basic
>framework done for interface and other elements
required in games before I
>decide to move to other things.
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