Hi Sean,
Bug 4645320 -
J3DGraphics2D RGBA will draw as ABGR if GL_EXT_abgr extension
not support
is submitted for this. It will be fixed in v1.3 beta2.
Thanks for your bug report.
- Kelvin
------------
Java 3D Team
Sun Microsystems Inc.
>Date: Thu, 28 Feb 2002 17:17:41 -0800
>From: Sean Sylvis <[EMAIL PROTECTED]>
>Subject: [JAVA3D] J3DGraphics2D: color display problems
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>I have been trying to develop a 2D graphics overlay system for my application.
I am developing on a Win2000 system using a 32mb ATI Radeon.
>
>Using the Java3D 1.3beta1 implementation, in my subclassed postRender() method,
I tried to draw to the 2D graphics context, but have come across a problem that
seems to be an implementation bug. All of the drawing to the graphics context
undergoes some sort of color conversion process before being displayed. For
example, the code:
>
>J3DGraphics2D.setPaint(new Color(255,255,0)); // Yellow
>J3DGraphics2D.drawRect(10, 10, 100, 100);
>J3DGraphics2D.drawString("molecule", vX, vY);
>
>results in the display of a magenta (Color: 255,0,255) rectangle and string.
Setting the color to J3DGraphics2D.setPaint(new Color(255,0,255)), or magenta,
results in the display of yellow objects. In addition, if ever the red component
of the color, such as Color(0,255,0) is equal to zero, no objects will display.
>
>It almost seems that the RGBA components are getting mixed up at some point in
the rendering pipeline. I am drawing directly to the J3DGraphics2D context, so I
don't believe I am causing this conversion. I thought that maybe the red
component was being converted to an alpha value, which after testing proved
incorrect. I have tried this on many different background colors, with all the
different AlphaComposite types, all with the same results.
>
>This color conversion bug did not show up when I was using the Java3D 1.2.1
implementation and it does not show up when I draw to a JPanel using the normal,
Graphics2D context in a Swing application without a Canvas3D.
>
>Thanks for any insight,
>
>Sean
>
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