gl4java-usergroup

[gl4java-usergroup] Re: accumulation buffer

[aNt <an...@to...>]

gezza's.

>
>is it right using the accumulation buffer is really _slow_ ?
>

arrr indeed. but then I set up my GeForce2Ultra to OpenGL and it flys.

>
>I'm trying to use the accum buffer because I need to set an alpha value to=
 a
>fixed display list with glColor's in it. With the accum buffer I should be
>able to add an already rendered display list with any alpha by glAccum
>(GL_ADD, alpha), right ?

that=B9s the one. u could also do the hack it to make things faster. make a
plain object and put it in front of your camera. make the plain object 30%
transparent. don=B9t clear the back buffer. and u will have the 30%
transparent shape do the clearing for u.

simple uh :)

>Is there a way to set the color (r,g,b) without setting the alpha too ?

theres: gl.glColor3f(r, g, b); and gl.glColor4f(r, g, b, a); all in them
there docs :).


tops

aNt

[gl4java-usergroup] JDK 1.4 support

[Max G. <gi...@li...>]

Hello!

Sven, when can we expect JDK 1.4 support in GL4Java (without direct 
buffers - so it just works with it)?

Max

Re: [gl4java-usergroup] accumulation buffer

[Jiba <a1...@So...>]

Thorsten Roemer wrote:
> 
> Hi *,
> 
> is it right using the accumulation buffer is really _slow_ ?

My own experiments (on a TNT2) show the same thing...

> Regardless of the value of accum bits set, I've 0,5fps in the accanti demo...
> (1GHz, 512Ram, RedHat7.1, GeForce2MX, nvidia-1.0-1251)
> 
> I'm trying to use the accum buffer because I need to set an alpha value to a
> fixed display list with glColor's in it. With the accum buffer I should be
> able to add an already rendered display list with any alpha by glAccum
> (GL_ADD, alpha), right ?
> 
> Is there a way to set the color (r,g,b) without setting the alpha too ?

If I remember, there is an OpenGL extension (maybe not supported by all
card), that allow to add a second alpha value.
I don't remember the name of this extension :-( but OpenGL.org has a doc
that lists all of them; you should look at it.

> regards,
> 
> Thorsten Roemer

Jiba

[gl4java-usergroup] accumulation buffer

[Thorsten R. <tho...@iv...>]

Hi *,

is it right using the accumulation buffer is really _slow_ ?

Regardless of the value of accum bits set, I've 0,5fps in the accanti demo...
(1GHz, 512Ram, RedHat7.1, GeForce2MX, nvidia-1.0-1251)

I'm trying to use the accum buffer because I need to set an alpha value to a 
fixed display list with glColor's in it. With the accum buffer I should be 
able to add an already rendered display list with any alpha by glAccum 
(GL_ADD, alpha), right ?

Is there a way to set the color (r,g,b) without setting the alpha too ?

regards,

Thorsten Roemer

[gl4java-usergroup] Bump and multitexturing using GL4

[Jean-Yves B. <jea...@wa...>]

Hello,

Is there any example in GL4 package using bump mapping ?

Thanxs :-)
-----------------
Jean-Yves BRUD - www.polyquark.com
-----------------

[gl4java-usergroup] GL Swing problems...GLAnimPanel and GLJPanel

[dando <on...@ya...>]

Hey!  Just want to say what a great job you did on the opengl port and I'm
totally blown away by the demos.

So far, I've had great success with using gl4java version 2.7.0 and GLCanvas
works like a charm and so far all the demos that implement the canvas class
compile perfectly in JBuilder 4.0.  (One Caveat...WINDOWS USERS NOTE: It
took me a while to figure out that you have to modify the PATH environment
variable in your "autoexec.bat" file to include the path to the gl4java .dll
files.  I put them in my bin folder of my Java Plug-In but that didn't work.
But the JRE will find your gl4java JAR files if you put them in the
"lib/ext" folder.  Go figure. Please include this tip in the FAQ file...it
will save people some headaches or modify the install program to modify the
"autoexec.bat" file)

However, the demos using GLAnimPanel and GLJPanel do not work (esp. the
swing demos), and my attempts to make a simple frame with a GLJPanel have
failed.  The same error message comes up...

fetched GL/GLU functions succesfully !
setpixel failed could not open a GL widget -- GL CONTEXT
can't create a GL context

Is anyone else having problems like this in JBuilder 4.0?  Does GLJPanel
need to be initialized differently from GLCanvas?  Why is the GL Context
missing?


Thanks in advance for your help...

Danny Yoon

[gl4java-usergroup] jdk1.4 native memory access

[noisebrain <zi...@co...>]

Quoted from a post on javalobby, possibly relevant here

                  Java's Newest Trick -- THE UNSAFE CLASS!

                  Posted by Osvaldo Doederlein, 25 May 2001


                  Everybody who cares about performance, please check NIO
and the improvements in JNI. The docs fail to state how
                  important they are!!

                  Let's say we want to implement an efficient 3D engine,
such as Java3D or an OpenGL mapping. Up to JDK1.3, there are
                  only two alternatives. #1 Data lives in Java objects,
and when native code wants its bits, it needs to either copy the data or
                  "pin" it, both expensive operations. #2 Data lives on
the native heap, and when Java wants, it needs to do native calls,
                  which is even more expensive.

                  With direct buffers, we can have data blocks that live
in the native heap (so the native code can read/write efficiently, and
                  the GC will not move it), but Java code can still access
it efficiently.

                  Some "magic" is required to implement this. I looked at
the sources, and there's no native code in "java.nio", instead the
                  buffer classes use a mysterious class named
"sun.misc.Unsafe" which is supposed to manipulate the native buffers
without
                  JNI penalty. This class is implemented with JNI, but
it's a unique, well-known spot with well-known semantics, and the
                  implementation is internal to the Java core (one cannot
change or override it) so the JIT compiler can easily replace its
                  code by custom code which can really access the native
buffers directly. (This kind of optimization is known as semantic
                  expansion.)

                  So I thought, "Unsafe" is still safe because the only
way to use this class is through the "java.nio" APIs, and these are
                  supposed to not have bugs, and to check app requests
(mostly bounds checks, which can also be optimized out) and
                  untrusted code will not be able to touch the Unsafe
class, right?

                  Wrong. Try the following code:

                  String osv = "Osvaldo";
                  sun.misc.Unsafe.getUnsafe().putInt(osv, 16, 2);
                  System.err.println(osv.length());
                  System.err.println(osv);

                  Run it and you will get "2" and "Os" as output. I
actually changed a private field of the String object (the length). Try
with
                  different offsets and values and you will get very
different results (most of them fatal crashes of the JVM).

                  Now, it seems like Sun sneaked a mechanism similar to
C#'s "unsafe" code, in the name of high performance. I am in
                  favor of this EXCEPT that only core libraries should be
allowed to use it (the getUnsafe() method is perfect for an efficient
                  security manager check). Making this legal to
application code (like it is in C#) means havoc. Well, this is a beta
release,
                  maybe the security is still missing but will be enforced
later. Or maybe this is handled just like any use of JNI. Do you
                  think this feature should be allowed for trusted, but
non-core code?

                  Back to our example, the new DirectBuffer feature of NIO
& JNI can be used to significantly reduce the overhead of talking
                  to the 3D engine. Either Java3D or a direct OpenGL
mapping library could use direct buffers to implement the 3D pipeline
                  (spitting vertex arrays, textures etc. to the 3D
engine). Or maybe the Java 3D-related objects can be implemented using a
                  ByteBuffer as the underlying storage (instead of using
Java arrays), so we completely eliminate copying at least in some
                  cases. I guess other code will benefit too (sound,
device control... anything that needs a high-performance data pipeline
                  from Java code to native support). 

[gl4java-usergroup] Does anybody have a problem with IE 5.5?

[Brian Y. L. <ys...@go...>]

When I run my applet using GL4Java 2.6.1 with IE 5.0, it works.
However it doesn't work with IE 5.5.
If someone know how it works with IE 5.5, please let me know.
God bless every hard worker :)

=====================
 Brian Youngseog Lee
 S/W Engineer
 Development 3
 GOMID
=====================

Re: [gl4java-usergroup] Swing?????

[eric <epa...@we...>]

There's an awesome example of these elements in the jausoft gl4java demos.
D/L the demos zip file
http://www.jausoft.com/Files/Java/1.1.X/GL4Java/archive/ look in
demos->swingDemos->InternalGLFrameDemo1.java.  If remember correctly, that's
an example of exactly what you want.

Good Luck,
-=eric=-

On 5/20/01 8:06 PM, "Felipe Gomes de Carvalho" <ka...@in...>
wrote:

> I'm writing an applet using JDesktopPane and JInternalFrame with GL4Java, but
> I'm
> having
> some problems when I try to minimize or maximize the JInternalFrame.
> 
> Does anyone know where I can get some samples using JDesktopPane and
> JInternalFrame with GL4Java ?
> 
> Thanks!!!!
> 
> 
> _______________________________________________
> gl4java-usergroup mailing list
> gl4...@li...
> http://lists.sourceforge.net/lists/listinfo/gl4java-usergroup

[gl4java-usergroup] Swing?????

[Felipe G. de C. <ka...@in...>]

I'm writing an applet using JDesktopPane and JInternalFrame with GL4Java, but I'm
having
some problems when I try to minimize or maximize the JInternalFrame.

Does anyone know where I can get some samples using JDesktopPane and
JInternalFrame with GL4Java ?

Thanks!!!!

[gl4java-usergroup] redhat 7.1 + gl4java 2.7.1.0 + nvidia 0.9-769

[Thorsten R. <tho...@iv...>]

Hi *,

does somebody have also problems with redhat 7.1 + gl4java2.5.0.0/gl4java 
2.7.1.0 + nvidia driver 0.9-769 ? With nvidia driver 0.96 it works. But other 
opengl-apps like UT run well on 0.9-769. I've tried jdk1.3.0 (with/without 
LD_ASSUME_KERNEL) & jdk1.3.1rc2.

The demos stop when deselecting "repaint". (i.e. MiscDemos/gears). But with 
"repaint" on it's soooo sloooow ...

Any ideas ?

ciao, Thorsten

-- 
Thorsten Roemer
IVISTAR - Kommunikationssysteme AG
Ehrenbergstr. 19 / 10245 Berlin
Tel.: 030-29363374 / Fax: 030-44678223

Re: [gl4java-usergroup] Selection + Picking

[Max G. <gi...@li...>]

Hello!

Sorry, I can't find the code with picking. If you still have problems, 
then maybe I can help you with what I remember.

Max

[gl4java-usergroup] offscreen rendering

[Xiaowen W. <swa...@cf...>]

Hi:
Is there any way to render the object models into offscreen openGL
context so that the process of data -> object model -> ... ->
image/video can be taken care automatically?
Thanks
XW

[gl4java-usergroup] Selection & picking - mouse drag

[Brian S. <bst...@ja...>]

Hi,

Do you know how to do selection & picking?

I have the code for the selection part.  What
I can't make happen is the mouse handling.

I need to force a mouse press event first, to check if 
an object is under the mouse.  


If so, I need to handle a mouse drag event to determine where
to repaint the graphic.

My program sent the event to mouse drag first.  

Do you have any samples that work?

Brian Steelman

Re: [gl4java-usergroup] Problem with MDK 7.2

[Max G. <gi...@li...>]

Francisco Andrades wrote:

>
>
>I have compiled Mesa 3.4.1
>
Try the newest. I have had problems with 3.4 and 3.5 worked fine.

>loaded native library: GL4JavaJauGljJNI13
>loaded native library: GL4JavaJauGLJNI12
>Sorry, can't find the library: GL4JavaJauGLUJNI12
>
Excuse me if I tell you the obvious but it seems like you should put 
this library there, too. If it will complain about missing libglu.so 
then download SGI's OSS version (RPM available) from Download section of 
Mesa3D site.

HTH,
Max

[gl4java-usergroup] Problem with MDK 7.2

[Francisco A. <big...@ya...>]

Hi, i have serveral weeks now trying to get gl4java work in my linux box and i
havent been able to do so, here is my configuration:

* Fujitsu C Series
* Video Card (dump from HardDrake):
	Vendor: Trident Microsystems
	Model: Cyber 9525 (generic)	Cyber 9525
	Bus Type: PCI
* RAM: 192 Mb
* Linux: Mandrake 7.2, KDE 2.1

I have compiled Mesa 3.4.1 but is not installed in the system, i'm using it
from a 'temp' location. I must note that i have had some trouble using OpenGL
with the package k-3d (www.k-3d.com), which is a 3d modeller that uses Mesa.
The problem was that the package needed 16 bits (r5, g6, b5) OpenGL mode, but
my system supported only a (weird?) 15 bits mode, so i had to change the source
to use that mode (r5, g5, b5) and it works fine now.

Here is the problem i'm facing: when trying to run any example there is a serie
of errors like this one (this is the result of trying to run the
demos/SwingDemos/InternalGLFrameDemo1):

<snip>

[root@trantor SwingDemos]# /opt/jdk1.3/jre/bin/java InternalGLFrameDemo1
GLContext.loadNativeLibraries will do it !
jvm vendor: Sun Microsystems Inc.
jvm version: 1.3.0_02
jvm version (parsed): major: 1, minor: 3
loaded native library: GL4JavaJauGljJNI13
loaded native library: GL4JavaJauGLJNI12
Sorry, can't find the library: GL4JavaJauGLUJNI12
java.lang.UnsatisfiedLinkError:
/mnt/linux/opt/jdk1.3/jre/lib/i386/libGL4JavaJauGLUJNI12.so:
/mnt/linux/opt/jdk1.3/jre/lib/i386/libGL4JavaJauGLUJNI12.so: undefined symbol:
gluTessNormal
GLJPanel could not load def. native libs.
Exception during loading: CrossColorJPanel
java.lang.NullPointerException
GLJPanel::componentResized(CrossColorJPanel[,0,37,290x203,layout=java.awt.FlowLayout,alignmentX=null,alignmentY=null,border=,flags=2,maximumSize=,minimumSize=,preferredSize=,defaultLayout=java.awt.FlowLayout[hgap=5,vgap=5,align=center]])
GLContext createGLContext
GLContext createGLContext
GLContext createGLContext
GLContext createGLContext
GLContext createGLContext
GLContext GLContext() failed

</snip>

After this is shown the window appears, but does not show the gl4java
components. The same error goes with all the examples.

I would appreciate your help on this a lot, since i'm porting a huge
applications from java3d to gl4java, and i'm interested in working with some
gl4java projects.

Thanks

__________________________________________________
Do You Yahoo!?
Yahoo! Auctions - buy the things you want at great prices
http://auctions.yahoo.com/

[gl4java-usergroup] RE: gl4java-usergroup digest, Vol 1 #225 - 2 msgs

[Steelman <mar...@ve...>]

Max,

If you could send me the zip & sources I would love to see them.  My sources
for this type of code have
conflicting information.

Thanks,  Mary

-----Original Message-----
From: gl4...@li...
[mailto:gl4...@li...]On Behalf Of
gl4...@li...
Sent: Thursday, April 26, 2001 10:31 PM
To: gl4...@li...
Subject: gl4java-usergroup digest, Vol 1 #225 - 2 msgs


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Today's Topics:

   1. Selection + Picking (Steelman)
   2. Re: Selection + Picking (Max Gilead)

--__--__--

Message: 1
From: "Steelman" <mar...@ve...>
To: <gl4...@li...>
Date: Thu, 26 Apr 2001 15:09:10 -0400
Subject: [gl4java-usergroup] Selection + Picking
Reply-To: gl4...@li...

Does anyone have some code (Java & GL4Java) that selects an object (from a
choice of several triangles, spheres, rectangles or cubes) and drags it
across the canvas using the mouse?

Thanks,

MJ



--__--__--

Message: 2
Date: Thu, 26 Apr 2001 22:21:12 +0200
From: Max Gilead <gi...@li...>
To: gl4...@li...
Subject: Re: [gl4java-usergroup] Selection + Picking
Reply-To: gl4...@li...

Steelman wrote:

>Does anyone have some code (Java & GL4Java) that selects an object (from a
>choice of several triangles, spheres, rectangles or cubes) and drags it
>across the canvas using the mouse?
>
I did it for my 3D modeler project before but I don't have the idea if
the code will work with newer JDK/GL4J. What is the problem? If you need
example fast then I can't help you. If you can wait few days I can dig
and send you the zip with sources.

Max






--__--__--

_______________________________________________
gl4java-usergroup mailing list
gl4...@li...
http://lists.sourceforge.net/lists/listinfo/gl4java-usergroup


End of gl4java-usergroup Digest

Re: [gl4java-usergroup] Selection + Picking

[Max G. <gi...@li...>]

Steelman wrote:

>Does anyone have some code (Java & GL4Java) that selects an object (from a
>choice of several triangles, spheres, rectangles or cubes) and drags it
>across the canvas using the mouse?
>
I did it for my 3D modeler project before but I don't have the idea if 
the code will work with newer JDK/GL4J. What is the problem? If you need 
example fast then I can't help you. If you can wait few days I can dig 
and send you the zip with sources.

Max

[gl4java-usergroup] Selection + Picking

[Steelman <mar...@ve...>]

Does anyone have some code (Java & GL4Java) that selects an object (from a
choice of several triangles, spheres, rectangles or cubes) and drags it
across the canvas using the mouse?

Thanks,

MJ

[gl4java-usergroup] HI! does anyone know that why Jbuilder 4.0 can't import compoent derived from glcanvas.?

[Kuan L. L. <ju...@ec...>]

as titled .thank you all


best regards

                                Kuan Lin Liu

Re: [gl4java-usergroup] Installation & compile help-Windows98

[Max G. <gi...@li...>]

Steelman wrote:

>Help.  I have read and reread the documents.  Can anyone tell me the file
>directory set up to make GL4Java work?
>
Any directory that is in your CLASSPATH. That what it is for. Or you can 
use 'java -classpath<path_to_jar_file> MyApp' if you don't want/can't 
set CLASSPATH.Of course in both cases you need to put native libraries 
(.so/.dll) in directory where system can find it (default directories or 
those specified in PATH).

HTH,
Max

[gl4java-usergroup] Chicago gl4java Initiative

[Robert A. W. <raw...@mi...>]

Hey gl4java-usergroup,
  
  So, does anybody happen to know the specifics on
OpenGL/Java3D/Stereopsis rendering on Sun Ultra80 platforms?  We've got
the Java3D and the StereoGraphics goggles working, but our OpenGL programs
arn't rendering using the quad-buffered stereoscopic refresh rates.  Does
anybody know of a command argument, a code line, config file, or something
that would effectively pipe the OpenGL up through our Java3D?  
  Moreover, anybody who can get that particular piece of code up and
running, and lives in the Chicagoland area, ought to contact me.  Our
university cybercafe is trying to put up a CAVE(like) system, and gl4java
libraries would probably double the number of demos and programs that
we're currently running.  So.... We're trying to get gl4java working...

  Opportunities currently exist in Chicago for VR, OpenGL, and Java
applications, programers and such....  Possible job openings even, but for
now, I'm just going to leave it at 'opportunities exist,' because I don't
want to get nailed for posting job-opening that don't.  <grin>
  Anyhow, get in touch with me if you're associated with Chicago, the
University of Chicago, (are interested in Chicago even) and happen to know
Java(3D)/OpenGL/Sun Workstations/WinNT/Win2000....  
  VRML, Cisco, and Sony hardware is a plus, but not strictly built into
the current project plans (although implementable)....
  Thanks! 
R. Abraham Watson

-----------------------------------------------------------------------

R. Abraham Watson, MCSE
VR Technician, USITE:Crerar Cybercafe

email:  raw...@mi...
cell:   773.255.6512
home:   773.256.0598

-----------------------------------------------------------------------
Aquarius horoscope from the Onion, on my birthday, Jan25th:

"Words can't describe the things that will happen to you this week.
Fortunately, the mathematics of nuclear fusion can."
-----------------------------------------------------------------------

[gl4java-usergroup] Installation & compile help-Windows98

[Steelman <mar...@ve...>]

Help.  I have read and reread the documents.  Can anyone tell me the file
directory set up to make GL4Java work?

I hava Windows 98 SE.

Right now, I have it rigged so that if I put my .java file in the GL4Java
folder, I can compile it.  I did set the security file, and I can only view
my applet in Internet Explorer.  I am getting error messages about files not
found.

What do you set CLASSPATH to?  Do you set PATH?
What if I try to put this into WindowsNT 4.0?  There is no CLASSPATH
VARIABLE?

Please help me find a way that works well.

Thanks

MJ

[gl4java-usergroup] Problems with VertexArrays and SelectBuffers under MS Java VM?

[Emil S. <em...@in...>]

Hello!

Does anybody else got problems with vertexarrays and/or SelectBuffer =
when using the MS Java VM?
That is when using IE.
I have an app/applet that works fine using SUN's jdk(1.3). But when =
using the MS VM things get messy.
I have tried both GL4Java ver 2.5 and 2.71. I have also tried three =
different versions of the MS VM (running w2000 w/wo servp 1).

The problems comes out like this:

With glSelectBuffer I get hits recorded BUT the select buffer doesnt get =
set. It is still all zeros.

When using vertex arrays the output on screens is more or less random =
(seems to read in unmapped memory).

Once again the code runs perfectly under SUN jdk. And also OK under MS =
VM wo vertexarrays/selectbuffer.

The common thing Ive noticed is that both glSelectbuffer and =
glDrawElements wants unsigned int/short.. as arg. I dont know if this =
have anything to do with it but.

Finally. Now I am installing cygwin and will try to do some error =
printing inside the native code (MSJDirect..code) to see if I can find =
anything...

To badly cygwin seems to be incomp. with my xemacs... well, hopefully I =
work it out... will try it on an other comp. otherwise :-(



(And yes GL4Java performance under MacOS X rocks!!!! )


Best regards and everything!

Emil Salling

[gl4java-usergroup] aNts Mac OS X demos with src

[aNt <an...@to...>]

come and teef all me crap code :)

http://www.topresultmate.com/gljava/

mostly Mac stuff. first stuff is done in OS9 CWpro6, then the rest is the
ProjectBuilder under OSX (that rocks)... have fun...


aNt


-------------------------
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London   W1F 9AH,      UK
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-------------------------