Re: [osg-users] Insersector doesn't take into account DrawableCullCallback result

[Trajce Nikolov NICK]

Hi Davide,

to addition to Robert - the way how I resolved similar case in the past was
indeed by having the NodeMask only on/off (0x0/0x) and in
combination with osg::Node::setUserValue where I was holding my ids (here
you can put your layer id for example) I was able to make the combination
of which nodes (for you layers) should be on or not. Just an idea

Cheers,
Nick

On Mon, Oct 17, 2016 at 5:24 PM, Davide Raccagni 
wrote:

> Hi Robert,
> thank you very much: Group override solves visibility and intersect
> problem at once.
>
> Cheers,
> Davide
>
> --
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=69045#69045
>
>
>
>
>
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Re: [osg-users] Insersector doesn't take into account DrawableCullCallback result

[Davide Raccagni]

Hi Robert,
thank you very much: Group override solves visibility and intersect problem at 
once.

Cheers,
Davide

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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=69045#69045





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Re: [osg-users] Insersector doesn't take into account DrawableCullCallback result

[Robert Osfield]

Hi Davide,

On 17 October 2016 at 15:48, Davide Raccagni  wrote:
> thanks for your quick reply. If I have well understood, the NameMask allow to 
> define up to 32 masks (32 bit). My problem is that I have an unpredictable 
> number of layers (in general more than 32): this is the reason why I have 
> used DrawableCullCallback. As an alternative you suggest to use Switch: in 
> this case I could define a class that extends Switch class and override 
> getValue function returning a value in accordance to Layer visibility. What 
> do you think about?

You needn't subclass from osg::Switch, you could just subclass from
osg::Group and override the traverse(.) method to provide the decision
about whether to traverse the subgraph or not.

Another approach is manage the switching on/off at a higher level but
use the NodeMask 0x0 or 0x as the two states for whether to
rendering or not a subgraph.

Robert.
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Re: [osg-users] Insersector doesn't take into account DrawableCullCallback result

[Davide Raccagni]

Hi Robert,
thanks for your quick reply. If I have well understood, the NameMask allow to 
define up to 32 masks (32 bit). My problem is that I have an unpredictable 
number of layers (in general more than 32): this is the reason why I have used 
DrawableCullCallback. As an alternative you suggest to use Switch: in this case 
I could define a class that extends Switch class and override getValue function 
returning a value in accordance to Layer visibility. What do you think about?

Thanks in advance

Cheers,
Davide

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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=69041#69041





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Re: [osg-users] Insersector doesn't take into account DrawableCullCallback result

[Robert Osfield]

Hi Davide,

The Intersectors don't have specific handling of drawable callbacks so
I don't think it'll be possible to do it how you want.

Personally I wouldn't use DrawableCullCalbacks to toggle on/off
drawables from rendering.  I'd either use a osg::Switch or a NodeMask
that decorates the subgraph that you want to toggle on/on.  The
NodeMask is pretty light weight and with OSG-3.4 onwards will work
with Drawable too, so this is what I'd use.

Another advantage of using NodeMask is because it's a built in feature
rather than use customization it will work with built in features.
You can also use traversal mask in combination with node masks if you
want.

Robert.

On 17 October 2016 at 12:34, Davide Raccagni  wrote:
> Hello,
> I need to define a specific DrawableCullCallback for each Geometry to
> hide/show them by using a layer approach like in AutoCAD. I've noticed that
> LinearIntersector and PolytopeIntersector don't skip drawable with a
> DrawableCullCallback assigned that returns true. Is there a way for the
> methods above to take the DrawableCullCallback result into account?
>
> Thanks in advance.
> Davide Raccagni
>
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[osg-users] Insersector doesn't take into account DrawableCullCallback result

[Davide Raccagni]

Hello,
I need to define a specific DrawableCullCallback for each Geometry to
hide/show them by using a layer approach like in AutoCAD. I've noticed that
LinearIntersector and PolytopeIntersector don't skip drawable with
a DrawableCullCallback assigned that returns true. Is there a way for the
methods above to take the DrawableCullCallback result into account?

Thanks in advance.
Davide Raccagni
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