Raffi:
Java3D currently does not provide a mechanism to do a partial update of texture
images. Using ImageComponent with the flag byReference and yUp is one way of
achieving what you want. Using byReference enables you to change a part of the
image on the application side. The advantage of using byReference and yUp is
that there is a possibility that internally Java3D will not make a copy of the
texture and is therefore faster. Currently on PCs, Java3D will not make a copy
of texture image for the following combinations of BufferedImage format and
ImageComponent format(ofcourse, byReference and Yup should both be set to true)
:
BufferedImage format ImageComponentFormat
---------------------- ----------------------
BufferedImage.TYPE_3BYTE_BGR ImageComponent.FORMAT_RGB8 or
ImageComponent.FORMAT_RGB
BufferedImage.TYPE_CUSTOM ImageComponent.FORMAT_RGB8 or
of form 3BYTE_RGB ImageComponent.FORMAT_RGB
BufferedImage.TYPE_CUSTOM ImageComponent.FORMAT_RGBA8 or
of form 4BYTE_RGBA ImageComponent.FORMAT_RGBA
BufferedImage.TYPE_BYTE_GRAY ImageComponent.FORMAT_CHANNEL8
On Solaris, the combinations below will not make a Java3D copy:
BufferedImage format ImageComponentFormat
---------------------- ----------------------
BufferedImage.TYPE_4BYTE_ABGR ImageComponent.FORMAT_RGBA8 or
ImageComponent.FORMAT_RGBA
BufferedImage.TYPE_CUSTOM ImageComponent.FORMAT_RGB8 or
of form 3BYTE_RGB ImageComponent.FORMAT_RGB
BufferedImage.TYPE_CUSTOM ImageComponent.FORMAT_RGBA8 or
of form 4BYTE_RGBA ImageComponent.FORMAT_RGBA
BufferedImage.TYPE_BYTE_GRAY ImageComponent.FORMAT_CHANNEL8
Note that an image associated with a live scene graph cannot be changed. So,
you need to first make the image unlive, change the image and set the image
back in the texture.
For more info on byReference, please check the javadoc on ImageComponent.
-Uma
Java3D Team
------------- Begin Forwarded Message -------------
MIME-Version: 1.0
Date: Wed, 7 Jun 2000 12:19:34 -0400
From: "Kasparian, Raffi J." <[EMAIL PROTECTED]>
Subject: Re: [JAVA3D] Graphic operations on texture images
To: [EMAIL PROTECTED]
Judging by the lack of response, either my question was unclear or no one
knows how to quickly edit the image used by a Texture2D.
Dear Sun programmers,
I need to paint dynamically on the surface of a sphere to create animation
effects. This operation is fairly fundamental to my project. Conceptually, I
would like to twiddle with some of the pixels stored in the image without
having to go through the time consuming process of creating an entirely new
ImageComponent2D and sticking it back into the Texture2D. My only other
alternative has been to create Shape3D's that tightly hug the surface of the
sphere thereby simulating (to an extent) the painting I would like to do.
This is ridiculously expensive in terms of the computer's memory and runtime
speed not to mention my own programming time. In short, it's not an
acceptable alternative either.
Does anyone have any solutions? If so, please help me out; if not, is this a
limitation of openGL? or Java3D? are there plans to implement something like
this?
Thanks,
-----Original Message-----
From: Kasparian, Raffi J. [mailto:[EMAIL PROTECTED]]
Sent: Friday, June 02, 2000 11:17 AM
To: [EMAIL PROTECTED]
Subject: [JAVA3D] Graphic operations on texture images
I would like to dynamically and quickly edit the image in a texture that is
applied to an object. The only way I figured out to do this is very slow. (4
seconds on my machine)
Here's what I'm doing:
draw what I want into a BufferedImage;//this is quick
//the following instructions are slow
ImageComponent2d.set( BufferedImage );
Texture2D.setImage( ImageComponent2d );
Appearance.setTexture( Texture2D );
It seems that there should be a way more efficient way to edit the image
since all I want is to change the color of some pixels. Does anyone know of
a better method?
Thanks,
Raffi
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