|
I "fixed" this problem by inserting a
GraphicsContext3D.flush(true) statement between the rendering of each sphere
(graphics.flush(false) does not work). This eats into the frame rate but
produces the correct results.
So it seems like GraphicsContext3D.setAppearance()
is not making a copy of my appearance object but is instead holding onto a
reference. Does anybody know if this is by (ouch) design?
If so it leaves you leaves you with 2 pretty grim
alternatives, call GraphicsContext3D.flush(true) before each call to
GraphicsContext3D.setAppearance() and pay a performance cost
since your app is going to block, or be forced into allocating a new
appearance object before each call to
GraphicsContext3D.setAppearance().
Please tell me this is a bug, thanks,
- John
----- Original Message -----
Sent: Saturday, December 23, 2000 6:13
PM
Subject: [JAVA3D] Immediate Mode
Appearance Question/Problem
Hi:
I have a pure immediate mode application which
draws a textured sphere. It works fine.
I modified the application so that it draws 2
spheres. It does this by using a single appearance object and setting the
appearance's texture to texture1 when I draw sphere1 and to texture2
when I draw sphere2. It doesn't work. It always draws both spheres with
the same texture, texture2 (actually it is kind of funny, every few
frames I can see the correct texture "flash" onto sphere1 and then it is
drawn over with sphere2's texture).
If I use two different appearance objects, one
for each sphere, the application works correctly. Why is this? Shouldn't I be
able to change appearance attributes on the fly, call
GraphicsContext3D.setAppearance() and expect the changes to take
effect?
Thanks,
John
pseudo code looks like this:
Appearance appearance;
Geometry sphere1;
Geometry sphere2;
Texture2D texture1;
Texture2D texture2;
Canvas3D canvas;
GraphicsContext3D graphics;
.....
void draw() {
graphics.clear();
appearance.setTexture(texture1);
graphics.setAppearance(appearance);
graphics.draw(sphere1);
appearance.setTexture(texture2);
graphics.setAppearance(appearance);
graphics.draw(sphere2);
canvas.swap();
}
| 