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

[Nicolas P. <NPI...@kl...>]

could you try the demo of picking ?
http://www.jausoft.com/Files/Java/1.1.X/GL4Java/demos/MiscDemos/select.h=
tml

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



happy new year.


-----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 objects


hi to all & a happy new year,

i have some troubles to get my picking&selecting routine working. to =
show
you the problem i have changed the "select"-demo form MiscDemos shipped =
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 empty =
but
also sometimes the correct values.
I deleted in this demo in method DoSelect(...) the gl.glPush(~0); and =
the
demo works fine but in my project the effect still remains.

any ideas ? thanks, Jens



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