Re: [gl4java-usergroup] problems with selecting/picking objects

[<jen...@ag...>]

----- Original Message -----
=46rom: "Nicolas PIEDELOUP" <NPI...@kl...>
To: <gl4...@li...>
Sent: Monday, January 06, 2003 10:52 AM
Subject: RE: [gl4java-usergroup] problems with selecting/picking obje=
cts


> could you try the demo of picking ?
>
http://www.jausoft.com/Files/Java/1.1.X/GL4Java/demos/MiscDemos/selec=
t.html
>

Yeah, this is the demo i ment in my mail.

> I have heard there was a bug on IE jvm, but not in Netscape.

I'm only working with applications ( standalone programs ). So i get =
this
problem with the original Sun JVM.



> -----Original Message-----
> From: Jens G=FCnther [mailto:jen...@ag...]
> Sent: Thursday, January 02, 2003 1:53 PM
> To: gl4...@li...
> Subject: [gl4java-usergroup] problems with selecting/picking object=
s
>
>
> hi to all & a happy new year,
>
> i have some troubles to get my picking&selecting routine working. t=
o show
> you the problem i have changed the "select"-demo form MiscDemos shi=
pped
with
> the GL4Java demos.
>
> the original Render method:
>
> public void Render( int mode )
> {
>     int i;
>
>     for(i=3D0; i < objectCount; i++)
>     {
>         if(mode =3D=3D GL_SELECT )
>         {
>             gl.glLoadName(i);
>         }
>         // ... drawing object[i] ...
>     }
> }
>
> so far so good, this works fine.
> the changed method:
>
> public void Render( int mode )
> {
>     int i;
>     for( i=3D0; i < objectsCount; i++ )
>     {
>         if(mode =3D=3D GL_SELECT )
>         {
>             gl.glPushName(i);
>         }
>         // ... drawing object[i];
>         if( mode =3D=3D GL_SELECT )
>         {
>             gl.glPopName();
>         }
>     }
> }
>
> and this won't work ( Java 1.4.0 & GL4Java 2.8.2.0 ). The
glRenderMode(...)
> correctly returns the number of hits ( 0|1) but the selectBuffer is=
 empty
> SOMETIMES ( while a hit is returned )! furthermore clicks ( random
number )
> on the same coordinates will mostly return 1 hit / selectBuffer emp=
ty but
> also sometimes the correct values.
> I deleted in this demo in method DoSelect(...) the gl.glPush(~0); a=
nd the
> demo works fine but in my project the effect still remains.
>
> any ideas ? thanks, Jens
>
>
>
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