Hi,
Thanks for your explanations.
If anyone can explain me the Depth class and the binName string , I would be
very grateful.
For now, I've tried this :
*void setNodeAlwaysRendered(osg::Node* n)
{
if(!n) return;
osg::ref_ptr<osg::StateSet> state = n->getOrCreateStateSet();
//no scene graph culling
n->setCullingActive(false);
//set depht test off
state->setMode(GL_DEPTH_TEST, osg::StateAttribute::OFF);
//last rendered
state->setRenderBinDetails(INT_MAX, "RenderBin");
}*
But nothing changed... I apply it on a PAT, and on a geode ... but the node
it still culled by the other one... I use HUDs in the scene, but the scene
graph is not attached to them... so I don't think it can explain that.
Is there some properties to check on the View ? compositeViewer ? camera ?
Can I apply that on every king of node ? is there a mean to force children
inherit the state ? is it necessary ?
Thanks for you help.
Regards,
Vincent.
2009/1/9 Serge Lages <serge.la...@gmail.com>
> Hi Vincent,
>
> I'll try to answer to your questions...
>
> On Fri, Jan 9, 2009 at 9:55 AM, Vincent Bourdier <
> vincent.bourd...@gmail.com> wrote:
>
>> Hi,
>>
>> I need some explanations about the ways OSG allow to modify the render.
>>
>> I am working on a function, to apply to a node, to set it always rendered
>> over the other nodes. In other words, If I apply this on an osgText, I would
>> be able to read the text whatever my camera position can be (of course if
>> text is in the frustum).
>>
>> I make some search and I found a lot of things:
>>
>> * node->setCullingActive() : disable/enable the culling on a node. I am I
>> good, disabling this on a node is not sufficient, after that we need to tell
>> the node when to be rendered, isn't it ?
>>
>
> You don't necessarily need to disable the culling to be sure to see your
> node. The culling is applied depending on the view frustum or the distance
> (small feature culling). And you're right, it's not sufficient to disable
> it.
>
>
>>
>> * state->setMode(GL_DEPTH_TEST, OFF) : same thing ? what is the
>> difference with the first one ? just OSG/OpenGl distinction ?
>>
>
> This one disable depth tests with the other nodes, which means that when
> you'll render your node, OpenGL will not check if your object is behind
> another one, it will render your node on top of everything rendered so far.
>
> It's a first step to be sure to see your node, so don't forget to set the
> GL_DEPTH_TEST to off.
>
>
>>
>> * state->setRenderbinDetails(binNum, binName) : num < 0 will be first
>> rendered, num >0 will be the last ? what is the binName ? I saw
>> "LastRenderBin" or "RenderBin" ... is there some keyword or it is just a
>> name ? what is this word function ?
>>
>
> RenderBins allows you to control the rendering order of your node, I must
> admit that it's a complex topic I don't still fully understand. But what you
> need to know is that if you set something like that :
>
> state->setRenderbinDetails(INT_MAX, "RenderBin") ;
>
> You'll be pretty sure to have your object rendered last. In combination
> with the GL_DEPTH_TEST, you've got your reciepe to get an object always
> rendered.
>
> But be aware to not have an other osg::Camera rendering after the one where
> your object is attached. In this case, be sure that you render your object
> with the last osg::Camera rendered in your scene.
>
> Hope this helps !
>
> --
> Serge Lages
> http://www.tharsis-software.com
>
> _______________________________________________
> osg-users mailing list
> osg-users@lists.openscenegraph.org
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
>
_______________________________________________
osg-users mailing list
osg-users@lists.openscenegraph.org
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
