[osg-users] How does shadow technic work if geometry shaders are in use
Trajce Nikolov NICK
trajce.nikolov.nick at gmail.com
Mon Jun 8 05:38:12 PDT 2015
Hi Werner,
I am not the author of the LISPSM technique (Wojtek Lewandowski is), but if
it all works for GL2 (which I use too) I expect it is something with the
GL3 support.
And yes, the shadow technique has it's own shaders you can replace too
(what I am doing for my project). Have a look at StandardShadowMap
interface.
Otherwise the code looks good, it is what I am doing it too. Again, if it
works for GL2 and not for GL3 then it might be GL3 specific. Can you see
any shadows with GL3 without using your shaders for the objectSwitch?
On Mon, Jun 8, 2015 at 2:20 PM, Werner Modenbach <Werner.Modenbach at texion.eu
> wrote:
> Sorry, was on a business trip for a while.
> Here is my code (shortened a little):
>
> osg::Group *rootNode = new osg::Group();
> view->setSceneData(rootNode);
>
> shadowedScene = new osgShadow::ShadowedScene;
> shadowedScene->setReceivesShadowTraversalMask(ReceivesShadowTraversalMask
> );
> shadowedScene->setCastsShadowTraversalMask(CastsShadowTraversalMask);
> rootNode->addChild(shadowedScene.get());
>
> objectSwitch = new osg::Switch;
> shadowedScene->addChild(objectSwitch);
>
>
> lightSource = new osg::LightSource;
> lightSource->setLight(myLight);
> lightSource->setReferenceFrame(osg::LightSource::ABSOLUTE_RF);
> lightSource->setLocalStateSetModes(osg::StateAttribute::ON);
> shadowedScene->addChild(lightSource.get());
>
>
> osg::StateSet * stateset = objectSwitch ->getOrCreateStateSet();
>
> // setting uniforms etc. here
>
> osg::Program * program = new osg::Program();
> stateset->setAttribute( program );
>
> program->addShader(Cl_ShaderGen::getShader(osg::Shader::VERTEX,
> forceGL3Mode, ...)); program->addShader(Cl_ShaderGen::getShader(osg::
> Shader::GEOMETRY, forceGL3Mode, ...)); program->addShader(Cl_ShaderGen::
> getShader(osg::Shader::FRAGMENT, forceGL3Mode, ...));
> view->getCamera()->getGraphicsContext()->getState()->
> setUseModelViewAndProjectionUniforms(forceGL3Mode);
> view->getCamera()->getGraphicsContext()->getState()->
> setUseVertexAttributeAliasing(forceGL3Mode);
>
>
> If I use GL2 mode everything works like expected.
> In GL3 mode without shadow technique everything works fine (using geometry
> shader)
> In GL3 mode assigning a shadow technique doesn't change anything i.e. no
> shadow appears.
> If I assign the schaders to the state set of shadowedScene in GL3 mode
> without shadow technique
> everything appears the normal way but when assigning a shadow technique
> geometry shaders
> don't do their work any more.
> So my guess is that shadow technique just replaces the shaders.
>
> Is my approach wrong? Do I do something in a non standard way?
>
> Many thanks for hints and help.
>
> - Werner -
>
>
>
>
> Am 29.05.2015 um 18:53 schrieb Trajce Nikolov NICK:
>
> Hard to say without seeing your code .... I have modified shaders for the
> LSPSM. Can you share a sample app ?
>
> On Fri, May 29, 2015 at 6:38 PM, Werner Modenbach <
> Werner.Modenbach at texion.eu> wrote:
>
>> Hi Nick,
>>
>> I'm using LightSpacePerspective shadow technique as well.
>> But I set the shaders only inside the scene graph where reqired.
>> Do I have to set them anywhere else?
>> My graph looks like that:
>> * ---------------
>>
>> * | RootNode |
>>
>> * ---------------
>>
>> * / \
>>
>> * --------------- ---------------------
>>
>> * | ShadowScene | |evtl. PPU-Prozessor|
>>
>> * --------------- ---------------------
>>
>> * / \
>>
>> * --------------- ---------------
>>
>> * | Switchnode | | LightSource |
>>
>> * --------------- --------------- * / \\\
>>
>>
>>
>> Am 29.05.2015 um 18:16 schrieb Trajce Nikolov NICK:
>>
>> Hi Werner,
>>
>> I am doing the same and using the LightSpacePerspective shadow
>> techinque. In your program you have to set your vertex and fragment shaders
>> as well, and it will be picked up correctly if you set the masks for
>> receiving/cast shadows .... So it should work. As long as they are part of
>> the top ShadowedScene
>>
>> Nick
>>
>>
>> Nick
>>
>> On Fri, May 29, 2015 at 5:56 PM, Werner Modenbach <
>> Werner.Modenbach at texion.eu> wrote:
>>
>>> Hi all,
>>>
>>> My scene contains many objects, which are created by geometry shaders.
>>> So no vertices are created outside the graphics card for those objects.
>>> So I use
>>> state->setUseVertexAttributeAliasing(true)
>>> and
>>> state->setUseModelViewAndProjectionUniforms(true)
>>>
>>> Is it possible using a shadow technique in this case? If I'm right the
>>> shadow technique installs it's own shaders.
>>>
>>> Thanks for any hint.
>>>
>>> - Werner -
>>>
>>> _______________________________________________
>>> osg-users mailing list
>>> osg-users at lists.openscenegraph.org
>>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>>>
>>>
>>
>>
>> --
>> trajce nikolov nick
>>
>>
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>
>
> --
> trajce nikolov nick
>
>
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