Raffi,
To modify the image you have to get the raster.
BufferedImage tmpImage = this.origImage.getAsBufferedImage();
int numBands = tmpImage.getRaster().getNumBands();
WritableRaster tile = tmpImage.getWritableTile(0, 0);
for (int b = 0; b < numBands; b++)
for (int y = 0; y < tile.getHeight(); y++)
for (int x = 0; x < tile.getWidth(); x++)
tile.setSample(x, y, b, somevalue);
tmpImage.setData(tile);
Then pass the BufferedImage to the ImageComponent2D constructor:
ImageComponent2D image = new ImageComponent2D(image.FORMAT_WHATEVER,
tmpImage.getWidth(), tmpImage.getWidth());
image.set(tmpImage);
If you need more functionality use the Java Advanced Imaging API (JAI)
which has itterators (+ whole a lot more).
-ba
Uma Sabada wrote:
>
> 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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--
Dr. A. Ballard Andrews
Senior Research Scientist
Schlumberger Doll Research
Old Quarry Road Ridgefield, CT 06877
tel: 203-431-5522 fax: 5521
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