On Fri, 2008-10-03 at 15:19 +0200, Jörn Reder wrote:
> still playing around with Clutter I faced a problem with proper hiding
> 3D surfaces. I ripped down a simple example (in Perl) which reproduces
> it. It's a cube (in fact just a ring with four sides, no top no bottom)
> you can rotate using left/right arrow keys. While rotating you see that
> the lastly added actor in the group is drawn on the top ignoring actual
> positions and depths.
> Is this intended?
yes, it is intended - in the sense that there is no proper solution that
guarantees a consistent behaviour in all the cases.
> How can I fix this?
you have to enable GL depth testing for the duration of the paint
sequence of the actor's parent.
use the Cogl->enable_depth_test() function to enable the depth testing
before painting the group containing your actor, and disables it when
done; something like:
$group->signal_connect(paint => sub { Clutter::Cogl->enable_depth_test(TRUE)
});
$group->signal_connect_after(paint => sub {
Clutter::Cogl->enable_depth_test(FALSE) });
or subclass Clutter::Group overriding the PAINT function, like:
package My::DepthGroup;
use Glib qw( :constants );
use Clutter;
use Glib::Object::Subclass 'Clutter::Group';
sub PAINT {
my ($self) = @_;
Clutter::Cogl->enable_depth_test(TRUE);
foreach my $child ($self->get_children()) {
$child->paint() if $child->visible();
}
Clutter::Cogl->enable_depth_test(FALSE);
}
and then use My::DepthGroup instead of Clutter::Group.
ciao,
Emmanuele.
--
Emmanuele Bassi, Intel Open Source Technology Center
--
Emmanuele Bassi, Intel Open Source Technology Center
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