gl4java-usergroup

[gl4java-usergroup] Model Loaders

[Powell, M. A. <Mar...@ps...>]

Is there any repositories out there of 3D Model Loaders, similar to
Java3D's? Specifically I am looking for a OBJ loader. Or am I just going
to have to bite the bullet and write it myself?

=20

Thanks,

Mark

=20

=20

RE: [gl4java-usergroup] Possible bug in gljMakeCurrentNative()

[Subu <ma...@ce...>]

Here's the test case. Initially, there are 2 canvases added to a JSplitPane,
and the JSplitPane itself is added to the content pane (JPanel) of the
Frame.

What I'm doing is...
-Remove the canvas (the one that was initially on the left of the split
pane) from the JSplitPane
-Remove the JSplitPane from the content pane.
-Add the removed canvas to the content pane.
The keystroke "s" toggles between the split configuration and the single
canvas configuration.

This test case does not work with the fix I've proposed, but it illustrates
the problem.
If time permits, I'll look into why my application works with this fix. 


> -----Original Message-----
> From: Kenneth B. Russell [mailto:kbr...@al...] 
> Sent: Sunday, July 21, 2002 11:59 AM
> To: Subu
> Cc: GL4Java Users
> Subject: Re: [gl4java-usergroup] Possible bug in 
> gljMakeCurrentNative()
> 
> 
> 
> > > What problem did you see that this patch fixes? I assume it
> > > was related to the removal of canvases from the component 
> hierarchy.
> >
> > Yes, that is correct. It just recreate's the OpenGL context 
> when the 
> > component hierarchy changes. It could be removing this 
> canvas from a 
> > component hierarchy or removing one of its parents from the 
> component 
> > hierarchy.
> 
> The OpenGL context shouldn't be recreated until the next time 
> the component is added to the hierarchy. I can believe that 
> your code fixes a problem here, but could you please either
> 
>   a) provide a test case
> 
>   b) describe exactly the problem you saw in your application
>      that this patch fixes
> 
> Thanks.
> 

Re: [gl4java-usergroup] Possible bug in gljMakeCurrentNative()

[Kenneth B. R. <kbr...@al...>]

> > What problem did you see that this patch fixes? I assume it 
> > was related to the removal of canvases from the component hierarchy.
>
> Yes, that is correct. It just recreate's the OpenGL context when the
> component hierarchy changes. It could be removing this canvas from a
> component hierarchy or removing one of its parents from the component
> hierarchy.

The OpenGL context shouldn't be recreated until the next time the
component is added to the hierarchy. I can believe that your code
fixes a problem here, but could you please either

  a) provide a test case

  b) describe exactly the problem you saw in your application
     that this patch fixes

Thanks.

Re: [gl4java-usergroup] Possible bug in gljMakeCurrentNative()

[Kenneth B. R. <kbr...@al...>]

> I do not have a test case as this is part of a huge application. However, if
> you're really really need the test case, I could work one one. Please let me
> know. Also, I do not know what "failure mode" means (in this context).

What problem did you see that this patch fixes? I assume it was
related to the removal of canvases from the component hierarchy.

Re: [gl4java-usergroup] Possible bug in gljMakeCurrentNative()

[Kenneth B. R. <kbr...@al...>]

> When the parent of a GLCanvas is changed, the code in the if block
> (gljMakeCurrentNative() in OpenGL_Win32_jawt.c) is executed.

Thanks for the patch. Could you please describe the failure mode
this fixes and provide a small test case?

It looks like the same patch applies to OpenGL_X11_jawt.c as
well. Once I've verified the fix I'll check in both files.

[gl4java-usergroup] Possible bug in gljMakeCurrentNative()

[Subu <ma...@ce...>]

When the parent of a GLCanvas is changed, the code in the if block
(gljMakeCurrentNative() in OpenGL_Win32_jawt.c) is executed.

        if(jawt_lock(env, pData, JNI_FALSE, verbose)==JNI_FALSE ||
           pData->result==JNI_FALSE
          )
        {
             /* this can happen:
               if ( (pJData->lock & JAWT_LOCK_SURFACE_CHANGED) != 0 )
    
               In this case, we need a new GLXContext ...
    
               This has to be queried by the java class,
               while using the native method hasJAWTSurfaceChanged !
              */

              if(verbose)
              {
                 fprintf(stderr,"\nGL4Java ERROR: MakeCurrent could not lock
JAWT reference!\n");
                 fflush(stderr);
              }
              ret=JNI_FALSE;
              jawt_close_unlock(env, pData, JNI_FALSE);

              return ret;
        }

Before the call to jawt_close_unlock(), pData->lock has the bit
JAWT_LOCK_SURFACE_CHANGED set.
After this call, this bit is cleared. 

Now gljMakeCurrent() (in GLContext.java) calls hasJAWTSurfaceChanged() to
check if the GLContext needs to be recreated, and hasJAWTSurfaceChanged()
always returns false.

I've made a local fix to set this bit after the call to jawt_close_unlock()
only if it was set before the call.
This seems to work nicely for me. Could someone who knows more about this
please tell me if this is the right thing to do? If it is correct, could one
of the developers please fix it for the next release.

JNIEXPORT jboolean JNICALL
Java_gl4java_GLContext_gljMakeCurrentNative( JNIEnv *env, jobject obj,
					     jobject canvas,
					     jlong disp,
					     jlong thisWin,
					     jlong glContext)
{
	...
	int lockSurfaceChanged = 0;
	...
	...
      if(jawt_lock(env, pData, JNI_FALSE, verbose)==JNI_FALSE ||
           pData->result==JNI_FALSE
          )
      {
		...
		...
		lockSurfaceChanged = pData->lock &
JAWT_LOCK_SURFACE_CHANGED;
            jawt_close_unlock(env, pData, JNI_FALSE);
		if (lockSurfaceChanged) 
			pData->lock |= JAWT_LOCK_SURFACE_CHANGED;
            return ret;
      }	
	...
	...	
}

-s

Re: [gl4java-usergroup] Re : JMenuItem over GLAnimCanvas

[guillaume D. <gui...@ne...>]

On Thu, 11 Jul 2002 09:51:58 +0200
"Alban Cousinie" <aco...@wa...> wrote:

> GLAnimCanvas is an awt and heavyweight component.
> 
> JMenus are swing and lightweight components.

> You may have 2 other alternatives :
> 
> -         Use an awt menu wich should be heavyweight and should display
> properly (I am not sure about this, you have to make a test. If you do
> it, please let me know how it works).
> 
> -         Draw the menu yourself in OpenGL at the right place : see
> MiscDemos\tessdemo.html for an exemple.

i read the example, it s not what i want.

using awt components worf fine in this way:

class GLTestMenu extends MenuBar
{

    /* liste des objets que je vais utiliser */
    Menu myMenuFile;
    Menu myMenuHelp;
    MenuItem myMenuItemAbout;


    /* constructor */
    GLTestMenu()
    {
	myMenuFile = new JMenu("File");
	this.add(myMenuFile);
	myMenuHelp = new Menu("Help");
	this.add(myMenuHelp);
	myMenuItemAbout = new MenuItem("About");
	myMenuHelp.add(myMenuItemAbout);
    }

    /* methodes */
}

but AWT Menu is not very beautifull compared to Swing.
i m trying another way with setDefaultLightWeightPopupEnabled(boolean) that Jiba
told. if it works and someone is interested, i'll post it.

thanks you two for your help,

-- 
guillaume

RE: [gl4java-usergroup] GLJPanel in software mode?

[Powell, M. A. <Mar...@ps...>]

Thank you Franck,=20

It helps a lot. Now I can get my stuff out of the SimplAnimApplet1 :)

Thanks again,
Mark

----------------------
Mark Powell
Programmer/Analyst - PSL NMSU
(505)522-9204=20

-----Original Message-----
From: Franck Delache [mailto:fde...@mi...]=20
Sent: Thursday, July 11, 2002 7:10 AM
To: Powell, Mark A.; 'Pepijn Van Eeckhoudt';
gl4...@li...
Subject: RE: [gl4java-usergroup] GLJPanel in software mode?

Ok I made an example for you.
I picked it up from tests I have done.
And a special for you, it includes drawing Japanese fonts ;-)

Take a look at it, I hope this will help. It is using font from M$
windows, so if you are on a Linux machine, just change the font name and
you'll be ok.

The code is not really clean and is full of commented code... That's my
test project... :/ Sorry.

Francky

-----Original Message-----
From: gl4...@li...
[mailto:gl4...@li...]On Behalf Of
Powell, Mark A.
Sent: 10 juillet, 2002 16:37
To: Pepijn Van Eeckhoudt; gl4...@li...
Subject: RE: [gl4java-usergroup] GLJPanel in software mode?

Would anyone be willing to write up a little example (say draw a
triangle) doing the following:

Use the GLEventListener (I need to get with the times here)
Place it into some AWT component (So I can get Hardware rendering)
Place the above renderer into a JPanel and place that panel into a
JFrame?

I'm having nothing but trouble getting a decent awt renderer into a
JFrame and need a little help.

If anyone is willing to do this for me, I'd be VERY grateful.

Thanks
Mark

----------------------
Mark Powell
Programmer/Analyst - PSL NMSU
(505)522-9204

-----Original Message-----
From: Pepijn Van Eeckhoudt [mailto:pep...@lu...]
Sent: Wednesday, July 10, 2002 1:30 PM
To: Powell, Mark A.; gl4...@li...
Subject: Re: [gl4java-usergroup] GLJPanel in software mode?

Doh, I missed your actual question :) You can always fall back to the
GL(anim)Canvas class. This is however an AWT component, so you can
expect
the usual mess when you combine swing and awt components.

Pepijn Van Eeckhoudt

On 10-07-2002 16:47, "Powell, Mark A." <Mar...@ps...> wrote:

> I was looking through the FAQ and came across the entry regarding
> GLJPanel and GLAnimCanvas, specifically this:
>
> "The GLJPanel implementation currently renders to an off-screen buffer
> and copies the pixels to the lightweight component. This leads to
> slowdowns over GLAnimCanvas because the rendering is not
> hardware-accelerated and because of the copying overhead."
>
> I have a JFrame that adds a GLJPanel which has a GLAnimJPanel added to
> it. Am I in software mode? If I am, is it possible to render in
hardware
> mode and continue to add it to a JFrame?
>
> Thanks for any help.
>
> --Mark
>
> ----------------------
> Mark Powell
> Programmer/Analyst - PSL NMSU
> (505)522-9204
>
>
>
> -------------------------------------------------------
> This sf.net email is sponsored by:ThinkGeek
> Two, two, TWO treats in one.
> http://thinkgeek.com/sf
> _______________________________________________
> gl4java-usergroup mailing list
> gl4...@li...
> https://lists.sourceforge.net/lists/listinfo/gl4java-usergroup



-------------------------------------------------------
This sf.net email is sponsored by:ThinkGeek
Two, two, TWO treats in one.
http://thinkgeek.com/sf
_______________________________________________
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Re: [gl4java-usergroup] GLJPanel in software mode?

[guillaume D. <gui...@ne...>]

On Thu, 11 Jul 2002 09:09:37 -0400
"Franck Delache" <fde...@mi...> wrote:


> Take a look at it, I hope this will help. It is using font from M$ windows,
> so if you are on a Linux machine, just change the font name and you'll be
> ok.

hum... in your mail you have attached a winmail.dat it looks like this:
x>"%¤äóÀset2¢
 pàkÉ	 i@up0ar °st  àvpd eµAnpa sp16,;¢c
@°!P10 ;-)sÄÄTap"°oµÀP iõ,:S`Y+¡\@@ÿuéâú/äÏk_æÏçßèïúªuä}°
û£r{›¡{ç^{Tïãá9oiè\zÎ$f3ièÆAXè+Át£õ¹»5uáYPjòiì\VÏ1téÑyyT'ض¢ÁÆØÁ6îJHâÇGLø.[DRͧ
A¸qcsß÷9ã³= >±êàBê/hkÂ!ÇòÛû£Fy2ôú±ó3}èã÷5Ù­SLÚÙ\º
°q\ÄO</Cbк\|3×cÿËT5×}îF_«úNÜye_7HüSQCGÚ|›ÍÜlåôÜÊiï»Ñ
ü5Ý9+'è)ó¨u0×aùø>>8cÀKÑù (¥=êlX8'@Í÷ðöëGýU¼Ö/Sª8ý}Ñä¯ÇâH#©­R
&¶ßgRg%xA£­xÍ¢ÃÒt1]¡+IrAÛÉ`ÈÈÝP,I¼¦ø 

where may i change the font name?
can't you just send it in plain/text?

thanks,

-- 
guillaume

RE: [gl4java-usergroup] GLJPanel in software mode?

[Franck D. <fde...@mi...>]

Ok I made an example for you.
I picked it up from tests I have done.
And a special for you, it includes drawing Japanese fonts ;-)

Take a look at it, I hope this will help. It is using font from M$ windows,
so if you are on a Linux machine, just change the font name and you'll be
ok.

The code is not really clean and is full of commented code... That's my test
project... :/ Sorry.

Francky

-----Original Message-----
From: gl4...@li...
[mailto:gl4...@li...]On Behalf Of Powell,
Mark A.
Sent: 10 juillet, 2002 16:37
To: Pepijn Van Eeckhoudt; gl4...@li...
Subject: RE: [gl4java-usergroup] GLJPanel in software mode?

Would anyone be willing to write up a little example (say draw a
triangle) doing the following:

Use the GLEventListener (I need to get with the times here)
Place it into some AWT component (So I can get Hardware rendering)
Place the above renderer into a JPanel and place that panel into a
JFrame?

I'm having nothing but trouble getting a decent awt renderer into a
JFrame and need a little help.

If anyone is willing to do this for me, I'd be VERY grateful.

Thanks
Mark

----------------------
Mark Powell
Programmer/Analyst - PSL NMSU
(505)522-9204

-----Original Message-----
From: Pepijn Van Eeckhoudt [mailto:pep...@lu...]
Sent: Wednesday, July 10, 2002 1:30 PM
To: Powell, Mark A.; gl4...@li...
Subject: Re: [gl4java-usergroup] GLJPanel in software mode?

Doh, I missed your actual question :) You can always fall back to the
GL(anim)Canvas class. This is however an AWT component, so you can
expect
the usual mess when you combine swing and awt components.

Pepijn Van Eeckhoudt

On 10-07-2002 16:47, "Powell, Mark A." <Mar...@ps...> wrote:

> I was looking through the FAQ and came across the entry regarding
> GLJPanel and GLAnimCanvas, specifically this:
>
> "The GLJPanel implementation currently renders to an off-screen buffer
> and copies the pixels to the lightweight component. This leads to
> slowdowns over GLAnimCanvas because the rendering is not
> hardware-accelerated and because of the copying overhead."
>
> I have a JFrame that adds a GLJPanel which has a GLAnimJPanel added to
> it. Am I in software mode? If I am, is it possible to render in
hardware
> mode and continue to add it to a JFrame?
>
> Thanks for any help.
>
> --Mark
>
> ----------------------
> Mark Powell
> Programmer/Analyst - PSL NMSU
> (505)522-9204
>
>
>
> -------------------------------------------------------
> This sf.net email is sponsored by:ThinkGeek
> Two, two, TWO treats in one.
> http://thinkgeek.com/sf
> _______________________________________________
> gl4java-usergroup mailing list
> gl4...@li...
> https://lists.sourceforge.net/lists/listinfo/gl4java-usergroup



-------------------------------------------------------
This sf.net email is sponsored by:ThinkGeek
Two, two, TWO treats in one.
http://thinkgeek.com/sf
_______________________________________________
gl4java-usergroup mailing list
gl4...@li...
https://lists.sourceforge.net/lists/listinfo/gl4java-usergroup 

Re: [gl4java-usergroup] JMenuItem over GLAnimCanvas

[Jiba <Jea...@im...>]

On 2002.07.10 16:10:02 +0000 guillaume Desticourt wrote:
> 
> hello,
> 
> i've a little problem with the GLAnimCanvas.
> in my main window, i've setted a JMenuBar, and when i developpe the JMenu
> clicking it, the JMenuItem wich should be on the GLAnimCanvas doesn't
> appear. i
> think it's normal, but i don't know how to solve this probleme.
> any idea?
> 
> thank you for your help.
> 
> the source:
> http://www.freenopen.net/~guillaume/fr/prog/gl4java/affiche/GLTestGraphic.java

The JMenuItem is SWING whereas the GLAnimCanvas is AWT...

A solution is to draw ALL menu in a different window (SWING does not do
that by default). For that, call:

    // The magic line for mixing SWING menus with AWT and GL4Java
    JPopupMenu.setDefaultLightWeightPopupEnabled(false);


At the very beginning of your code. Contrary to what one may understand, it
affects all menus and not only popupmenu.

Jiba

[gl4java-usergroup] Re : JMenuItem over GLAnimCanvas

[Alban C. <aco...@wa...>]

I=92m not an expert about Java GUI components, but this question is =
often
asked on the mailing list (and we should add it to the FAQ).=20

=20

Here is what I understood :

=20

GLAnimCanvas is an awt and heavyweight component.

JMenus are swing and lightweight components.

Lightweight and heavyweight components don=92t mix properly, as
heavyweight components are always draw on top of lightweight components.
Thus, your menu opens behind your canvas.

So if you want to be able to display a menu over your OpenGL stuff, you
need to use a GLJPanel wich is lightweight. (It works, see the demo in
swingDemos/GLSwingDemoApplet for an exemple). The drawback is the
GLJPanel is not hardware accelerated, so you will lose performance over
GLAnimCanvas.

=20

You may have 2 other alternatives :

-         Use an awt menu wich should be heavyweight and should display
properly (I am not sure about this, you have to make a test. If you do
it, please let me know how it works).

-         Draw the menu yourself in OpenGL at the right place : see
MiscDemos\tessdemo.html for an exemple.

=20

Good day

=20

Alban Cousini=E9

=20

=20

=20

=20

=20

RE: [gl4java-usergroup] GLJPanel in software mode?

[Powell, M. A. <Mar...@ps...>]

Would anyone be willing to write up a little example (say draw a
triangle) doing the following:

Use the GLEventListener (I need to get with the times here)
Place it into some AWT component (So I can get Hardware rendering)
Place the above renderer into a JPanel and place that panel into a=20
JFrame?

I'm having nothing but trouble getting a decent awt renderer into a
JFrame and need a little help.

If anyone is willing to do this for me, I'd be VERY grateful.

Thanks
Mark

----------------------
Mark Powell
Programmer/Analyst - PSL NMSU
(505)522-9204=20

-----Original Message-----
From: Pepijn Van Eeckhoudt [mailto:pep...@lu...]=20
Sent: Wednesday, July 10, 2002 1:30 PM
To: Powell, Mark A.; gl4...@li...
Subject: Re: [gl4java-usergroup] GLJPanel in software mode?

Doh, I missed your actual question :) You can always fall back to the
GL(anim)Canvas class. This is however an AWT component, so you can
expect
the usual mess when you combine swing and awt components.

Pepijn Van Eeckhoudt

On 10-07-2002 16:47, "Powell, Mark A." <Mar...@ps...> wrote:

> I was looking through the FAQ and came across the entry regarding
> GLJPanel and GLAnimCanvas, specifically this:
>=20
> "The GLJPanel implementation currently renders to an off-screen buffer
> and copies the pixels to the lightweight component. This leads to
> slowdowns over GLAnimCanvas because the rendering is not
> hardware-accelerated and because of the copying overhead."
>=20
> I have a JFrame that adds a GLJPanel which has a GLAnimJPanel added to
> it. Am I in software mode? If I am, is it possible to render in
hardware
> mode and continue to add it to a JFrame?
>=20
> Thanks for any help.
>=20
> --Mark
>=20
> ----------------------
> Mark Powell
> Programmer/Analyst - PSL NMSU
> (505)522-9204=20
>=20
>=20
>=20
> -------------------------------------------------------
> This sf.net email is sponsored by:ThinkGeek
> Two, two, TWO treats in one.
> http://thinkgeek.com/sf
> _______________________________________________
> gl4java-usergroup mailing list
> gl4...@li...
> https://lists.sourceforge.net/lists/listinfo/gl4java-usergroup

Re: [gl4java-usergroup] GLJPanel in software mode?

[Pepijn V. E. <pep...@lu...>]

Doh, I missed your actual question :) You can always fall back to the
GL(anim)Canvas class. This is however an AWT component, so you can expect
the usual mess when you combine swing and awt components.

Pepijn Van Eeckhoudt

On 10-07-2002 16:47, "Powell, Mark A." <Mar...@ps...> wrote:

> I was looking through the FAQ and came across the entry regarding
> GLJPanel and GLAnimCanvas, specifically this:
> 
> "The GLJPanel implementation currently renders to an off-screen buffer
> and copies the pixels to the lightweight component. This leads to
> slowdowns over GLAnimCanvas because the rendering is not
> hardware-accelerated and because of the copying overhead."
> 
> I have a JFrame that adds a GLJPanel which has a GLAnimJPanel added to
> it. Am I in software mode? If I am, is it possible to render in hardware
> mode and continue to add it to a JFrame?
> 
> Thanks for any help.
> 
> --Mark
> 
> ----------------------
> Mark Powell
> Programmer/Analyst - PSL NMSU
> (505)522-9204 
> 
> 
> 
> -------------------------------------------------------
> This sf.net email is sponsored by:ThinkGeek
> Two, two, TWO treats in one.
> http://thinkgeek.com/sf
> _______________________________________________
> gl4java-usergroup mailing list
> gl4...@li...
> https://lists.sourceforge.net/lists/listinfo/gl4java-usergroup

Re: [gl4java-usergroup] GLJPanel in software mode?

[Pepijn V. E. <pep...@lu...>]

If you are using the GL(Anim)Jpanel, you will always be using software mode.
The problem here is that most opengl do not support hw accelerated offscreen
rendering. There was a discussion some time ago about how we could work
around this. I offered to look in to it back then, but unfortunately I
haven't had any time to do that yet...

Pepijn Van Eeckhoudt

On 10-07-2002 16:47, "Powell, Mark A." <Mar...@ps...> wrote:

> I was looking through the FAQ and came across the entry regarding
> GLJPanel and GLAnimCanvas, specifically this:
> 
> "The GLJPanel implementation currently renders to an off-screen buffer
> and copies the pixels to the lightweight component. This leads to
> slowdowns over GLAnimCanvas because the rendering is not
> hardware-accelerated and because of the copying overhead."
> 
> I have a JFrame that adds a GLJPanel which has a GLAnimJPanel added to
> it. Am I in software mode? If I am, is it possible to render in hardware
> mode and continue to add it to a JFrame?
> 
> Thanks for any help.
> 
> --Mark
> 
> ----------------------
> Mark Powell
> Programmer/Analyst - PSL NMSU
> (505)522-9204 
> 
> 
> 
> -------------------------------------------------------
> This sf.net email is sponsored by:ThinkGeek
> Two, two, TWO treats in one.
> http://thinkgeek.com/sf
> _______________________________________________
> gl4java-usergroup mailing list
> gl4...@li...
> https://lists.sourceforge.net/lists/listinfo/gl4java-usergroup

[gl4java-usergroup] JMenuItem over GLAnimCanvas

[guillaume D. <gui...@ne...>]

hello,

i've a little problem with the GLAnimCanvas.
in my main window, i've setted a JMenuBar, and when i developpe the JMenu
clicking it, the JMenuItem wich should be on the GLAnimCanvas doesn't appear. i
think it's normal, but i don't know how to solve this probleme.
any idea?

thank you for your help.

the source:
http://www.freenopen.net/~guillaume/fr/prog/gl4java/affiche/GLTestGraphic.java

-- 
guillaume

Re: [gl4java-usergroup] Additional GL4Java docs needed?

[Antony R. <an...@li...>]

I'm currently trying to develop a range of tutorials as well.  I also in =
the process of designing some kind of site to house all this info as =
well.

So, I'd be more than happy to put your documents up.

Let me know what you think.

Antony
  ----- Original Message -----=20
  From: Chad Stansbury=20
  To: gl4...@li...=20
  Sent: Wednesday, July 10, 2002 2:27 PM
  Subject: [gl4java-usergroup] Additional GL4Java docs needed?


  Hello -

  I'm a newbie at both OpenGL, and GL4Java.  However, I've been reading =
the redbook, and using GL4Java to implement a lot of the exercise in the =
redbook.  I had a lot of problems getting GL4Java set up properly =
(mostly due to my inability to read the FAQ), and would like to begin =
writing some docs/tutorial to make the process easier for other =
newbies...

  Does anyone think this would be useful?  If so, is there someone who =
would like to house these documents on the website?

  Thanks in Advance, Chad
    ----- Original Message -----=20
    From: Chad Stansbury=20
    To: gl4...@li...=20
    Sent: Saturday, June 08, 2002 12:11 PM
    Subject: Re: [gl4java-usergroup] Newbie: Using GLJPanel


    Oops, looks like I spoke too soon.  The gljSwap() works just fine, =
thank you.  It's the gljFree() that was throwing the exception.  Please =
forget all the nonsense that I spouted in my previous email.

    Thanks, Chad

    PS - This does, however, raise the question "When to use gljFree()?

[gl4java-usergroup] GLJPanel in software mode?

[Powell, M. A. <Mar...@ps...>]

I was looking through the FAQ and came across the entry regarding
GLJPanel and GLAnimCanvas, specifically this:

"The GLJPanel implementation currently renders to an off-screen buffer
and copies the pixels to the lightweight component. This leads to
slowdowns over GLAnimCanvas because the rendering is not
hardware-accelerated and because of the copying overhead."

I have a JFrame that adds a GLJPanel which has a GLAnimJPanel added to
it. Am I in software mode? If I am, is it possible to render in hardware
mode and continue to add it to a JFrame?=20

Thanks for any help.

--Mark

----------------------
Mark Powell
Programmer/Analyst - PSL NMSU
(505)522-9204=20

[gl4java-usergroup] Additional GL4Java docs needed?

[Chad S. <sta...@ea...>]

Hello -

I'm a newbie at both OpenGL, and GL4Java.  However, I've been reading =
the redbook, and using GL4Java to implement a lot of the exercise in the =
redbook.  I had a lot of problems getting GL4Java set up properly =
(mostly due to my inability to read the FAQ), and would like to begin =
writing some docs/tutorial to make the process easier for other =
newbies...

Does anyone think this would be useful?  If so, is there someone who =
would like to house these documents on the website?

Thanks in Advance, Chad
  ----- Original Message -----=20
  From: Chad Stansbury=20
  To: gl4...@li...=20
  Sent: Saturday, June 08, 2002 12:11 PM
  Subject: Re: [gl4java-usergroup] Newbie: Using GLJPanel


  Oops, looks like I spoke too soon.  The gljSwap() works just fine, =
thank you.  It's the gljFree() that was throwing the exception.  Please =
forget all the nonsense that I spouted in my previous email.

  Thanks, Chad

  PS - This does, however, raise the question "When to use gljFree()?

[gl4java-usergroup] Stupid question...but how do you find the current translation

[Drake W. <dr...@er...>]

Ok, how do you find the current translation of the state model?

I want to rotate an item... I have other translations going before it that I
don't control (from the objects doing the rotation)...

Is there a way to say glGetTranslations() in any form?

I really don't want to add another method to my interface to have all the
beans rotate before I start moving them.

thanks : )

RE: [gl4java-usergroup] lighting problem

[Combe, C. <C....@na...>]

thanks,
col

-----Original Message-----
From: Antony Ribot [mailto:an...@li...]
Sent: 09 July 2002 16:18
To: Combe, Colin; gl4...@li...
Subject: Re: [gl4java-usergroup] lighting problem


http://www.acm.org/pubs/tog/GraphicsGems/gemsiii/newell.c

Antony

----- Original Message -----
From: "Combe, Colin" <C....@na...>
To: <gl4...@li...>
Sent: Tuesday, July 09, 2002 3:59 PM
Subject: RE: [gl4java-usergroup] lighting problem


Thanks Jens and Antony,

yes, as you have both pointed out i have a problem with my normal
calculations - a simple cube works fine. Oh dear... i'm not sure how to
start debugging...
cheers,
col

-----Original Message-----
From: Jens G=FCnther [mailto:jen...@ag...]
Sent: 09 July 2002 15:30
To: Combe, Colin
Subject: Re: [gl4java-usergroup] lighting problem


Hi Colin,

i use the following structure in my display()-method:

glMatrixMode( GL_PROJECTION );       // define properties for =
projection
glLoadIdentity();                    // initialize projection matrix
glFrustum();                         // define view frustum, you can
                                      // also use gluPerspective(...)
glMatrixMode( GL_MODELVIEW );        // start of model transformations
glLoadIdentity();                    // init modelview-matrix
// place here objects, which are static to the cameraposition. This
// means that all objects you draw here move with the camera, like a
// headlight.
glLoadIdentity();                    // again init modelview-matrix to
                                      // forgot the transformations =
make
                                      // to the camera-static objects
// now place here your transformation for the camera.
gluLookAt(...);
// and now after a long way of initializing... draw your objects, also
// lights like the following ( in my code ):
glLightfv( GL_LIGHT0, GL_POSITION, vpos ); // static Light
glPushMatrix;                        // save current transformation,
                                      // the cameraview
//transform object
//draw object
glPopMatrix;                         // forgot last transformations

hope, this would help you. The logic for translations, rotations and
scale is'nt easy to understand, i had tried many times to get the right
orders.
Finally i compiled your code and run it. If you exactly observe your
model you must recognize that it seems as the light will rotate faster
as the model, so I THINK YOU HAVE SOME PROBLEMS WITH YOUR NORMALS!
Because if you comment out the push and pop between the lightposition =
is
made then you will have a structure nearly to my.

good luck ;)
Jens


-----------------------------------------------------
                   [ age-works  softwaretechnologies ]

                             http://www.age-works.de


  Jens G=FCnther

  email:                  jen...@ag...
-----------------------------------------------------



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RE: [gl4java-usergroup] lighting problem

[Combe, C. <C....@na...>]

hmmm... given that my normal calculations are completely separate from =
the
maths used by openGL to rotate the object - how come the rotation of =
the
object affects the answers I get for my normals?
confused,
colin=20

-----Original Message-----
From: Combe, Colin [mailto:C....@na...]
Sent: 09 July 2002 15:59
To: gl4...@li...
Subject: RE: [gl4java-usergroup] lighting problem


Thanks Jens and Antony,

yes, as you have both pointed out i have a problem with my normal
calculations - a simple cube works fine. Oh dear... i'm not sure how to
start debugging...
cheers,
col

-----Original Message-----
From: Jens G=FCnther [mailto:jen...@ag...]
Sent: 09 July 2002 15:30
To: Combe, Colin
Subject: Re: [gl4java-usergroup] lighting problem


Hi Colin,

i use the following structure in my display()-method:

glMatrixMode( GL_PROJECTION );       // define properties for =
projection
glLoadIdentity();                    // initialize projection matrix
glFrustum();                         // define view frustum, you can
                                      // also use gluPerspective(...)
glMatrixMode( GL_MODELVIEW );        // start of model transformations
glLoadIdentity();                    // init modelview-matrix
// place here objects, which are static to the cameraposition. This
// means that all objects you draw here move with the camera, like a
// headlight.
glLoadIdentity();                    // again init modelview-matrix to
                                      // forgot the transformations =
make
                                      // to the camera-static objects
// now place here your transformation for the camera.
gluLookAt(...);
// and now after a long way of initializing... draw your objects, also
// lights like the following ( in my code ):
glLightfv( GL_LIGHT0, GL_POSITION, vpos ); // static Light
glPushMatrix;                        // save current transformation,
                                      // the cameraview
//transform object
//draw object
glPopMatrix;                         // forgot last transformations

hope, this would help you. The logic for translations, rotations and=20
scale is'nt easy to understand, i had tried many times to get the right =

orders.
Finally i compiled your code and run it. If you exactly observe your=20
model you must recognize that it seems as the light will rotate faster=20
as the model, so I THINK YOU HAVE SOME PROBLEMS WITH YOUR NORMALS!=20
Because if you comment out the push and pop between the lightposition =
is=20
made then you will have a structure nearly to my.

good luck ;)
Jens


-----------------------------------------------------
                   [ age-works  softwaretechnologies ]

                             http://www.age-works.de


  Jens G=FCnther

  email:                  jen...@ag...
-----------------------------------------------------



-------------------------------------------------------
This sf.net email is sponsored by:ThinkGeek
Stuff, things, and much much more.
http://thinkgeek.com/sf
_______________________________________________
gl4java-usergroup mailing list
gl4...@li...
https://lists.sourceforge.net/lists/listinfo/gl4java-usergroup

Re: [gl4java-usergroup] lighting problem

[Antony R. <an...@li...>]

http://www.acm.org/pubs/tog/GraphicsGems/gemsiii/newell.c

Antony

----- Original Message -----
From: "Combe, Colin" <C....@na...>
To: <gl4...@li...>
Sent: Tuesday, July 09, 2002 3:59 PM
Subject: RE: [gl4java-usergroup] lighting problem


Thanks Jens and Antony,

yes, as you have both pointed out i have a problem with my normal
calculations - a simple cube works fine. Oh dear... i'm not sure how to
start debugging...
cheers,
col

-----Original Message-----
From: Jens Günther [mailto:jen...@ag...]
Sent: 09 July 2002 15:30
To: Combe, Colin
Subject: Re: [gl4java-usergroup] lighting problem


Hi Colin,

i use the following structure in my display()-method:

glMatrixMode( GL_PROJECTION );       // define properties for projection
glLoadIdentity();                    // initialize projection matrix
glFrustum();                         // define view frustum, you can
                                      // also use gluPerspective(...)
glMatrixMode( GL_MODELVIEW );        // start of model transformations
glLoadIdentity();                    // init modelview-matrix
// place here objects, which are static to the cameraposition. This
// means that all objects you draw here move with the camera, like a
// headlight.
glLoadIdentity();                    // again init modelview-matrix to
                                      // forgot the transformations make
                                      // to the camera-static objects
// now place here your transformation for the camera.
gluLookAt(...);
// and now after a long way of initializing... draw your objects, also
// lights like the following ( in my code ):
glLightfv( GL_LIGHT0, GL_POSITION, vpos ); // static Light
glPushMatrix;                        // save current transformation,
                                      // the cameraview
//transform object
//draw object
glPopMatrix;                         // forgot last transformations

hope, this would help you. The logic for translations, rotations and
scale is'nt easy to understand, i had tried many times to get the right
orders.
Finally i compiled your code and run it. If you exactly observe your
model you must recognize that it seems as the light will rotate faster
as the model, so I THINK YOU HAVE SOME PROBLEMS WITH YOUR NORMALS!
Because if you comment out the push and pop between the lightposition is
made then you will have a structure nearly to my.

good luck ;)
Jens


-----------------------------------------------------
                   [ age-works  softwaretechnologies ]

                             http://www.age-works.de


  Jens Günther

  email:                  jen...@ag...
-----------------------------------------------------



-------------------------------------------------------
This sf.net email is sponsored by:ThinkGeek
Stuff, things, and much much more.
http://thinkgeek.com/sf
_______________________________________________
gl4java-usergroup mailing list
gl4...@li...
https://lists.sourceforge.net/lists/listinfo/gl4java-usergroup

RE: [gl4java-usergroup] lighting problem

[Combe, C. <C....@na...>]

Thanks Jens and Antony,

yes, as you have both pointed out i have a problem with my normal
calculations - a simple cube works fine. Oh dear... i'm not sure how to
start debugging...
cheers,
col

-----Original Message-----
From: Jens G=FCnther [mailto:jen...@ag...]
Sent: 09 July 2002 15:30
To: Combe, Colin
Subject: Re: [gl4java-usergroup] lighting problem


Hi Colin,

i use the following structure in my display()-method:

glMatrixMode( GL_PROJECTION );       // define properties for =
projection
glLoadIdentity();                    // initialize projection matrix
glFrustum();                         // define view frustum, you can
                                      // also use gluPerspective(...)
glMatrixMode( GL_MODELVIEW );        // start of model transformations
glLoadIdentity();                    // init modelview-matrix
// place here objects, which are static to the cameraposition. This
// means that all objects you draw here move with the camera, like a
// headlight.
glLoadIdentity();                    // again init modelview-matrix to
                                      // forgot the transformations =
make
                                      // to the camera-static objects
// now place here your transformation for the camera.
gluLookAt(...);
// and now after a long way of initializing... draw your objects, also
// lights like the following ( in my code ):
glLightfv( GL_LIGHT0, GL_POSITION, vpos ); // static Light
glPushMatrix;                        // save current transformation,
                                      // the cameraview
//transform object
//draw object
glPopMatrix;                         // forgot last transformations

hope, this would help you. The logic for translations, rotations and=20
scale is'nt easy to understand, i had tried many times to get the right =

orders.
Finally i compiled your code and run it. If you exactly observe your=20
model you must recognize that it seems as the light will rotate faster=20
as the model, so I THINK YOU HAVE SOME PROBLEMS WITH YOUR NORMALS!=20
Because if you comment out the push and pop between the lightposition =
is=20
made then you will have a structure nearly to my.

good luck ;)
Jens


-----------------------------------------------------
                   [ age-works  softwaretechnologies ]

                             http://www.age-works.de


  Jens G=FCnther

  email:                  jen...@ag...
-----------------------------------------------------

FW: [gl4java-usergroup] lighting problem

[Combe, C. <C....@na...>]

- good point
i've moved it to the init method now (file attatched) but unfortunately its
still doing the same thing:(
thanks,
col
-----Original Message-----
From: Antony Ribot [mailto:an...@li...]
Sent: 09 July 2002 13:31
To: gl4...@li...
Subject: Re: [gl4java-usergroup] lighting problem


If you want your light to stay in a static position why not put it in your
init method?

Antony

----- Original Message -----
From: "Combe, Colin" <C....@na...>
To: <gl4...@li...>
Sent: Tuesday, July 09, 2002 1:11 PM
Subject: [gl4java-usergroup] lighting problem


> hi,
> i been having some problems trying to turn an object around - the light
> source keeps moving with it. I'm fairly new to all this, but the advice i
> got from a discussion group over at openGL.org was that a display method
> with the following structure -
>
> LoadIdentity
> Position the camera
> Push
> Position the light
> Pop
> For each object
> ....Push
> ....Position the object
> ....Draw the object
> ....Pop
> Swap buffers
>
> should allow me to rotate objects independantly of the light source, the
> desired effect. I think that this is what the attatched code does - but
when
> i run it the light source turns with the object. Whats going wrong?
>
> thanks,
> col
>
> p.s. Sven - if you're reading this - thanks for the advice you gave me
about
> adding and removing canvases from frames a couiple of weeks ago - i've not
> dowloaded the source from the cvs tree to try it yet but will give it a go
> soon.
>
>
>
>  <<GLApp.java>>
>



-------------------------------------------------------
This sf.net email is sponsored by:ThinkGeek
Stuff, things, and much much more.
http://thinkgeek.com/sf
_______________________________________________
gl4java-usergroup mailing list
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