Hi there
I tried to obtain the Material from a loaded geometry which ended up
everytime in a thrown exception, because the geometry pointer wasn't
valid (NullFC).
What I did was
___
NodePtr model = SceneFileHandler::the().read("tie.wrl");
GeometryPtr geo = GeometryPtr::dcast(model->getCore());
if(geo != NullFC)
std::cout<<"something"<<std::endl;
else
std::cout<<"NullFC"<<std::endl;
___
-> the GeometryPtr is always NullFC with any loaded (wrl, 3ds, obj)
geometry, which I interpret as that the core is something else than a
Geometry.
Actually it is a GroupPtr for any loaded (wrl, 3ds, obj) geometry. Which
make sense.
So my question is, how can I access the loaded Material of the Group
node childs and add my shader??
Is there a simple possibility or do I have to traverse all the subnodes
and check them for theire Materials to add my Shader??
Actually I'm a bit lost. I thought it wouldn't be that difficult.
I hope somebody has an idea.
Thanks
Carsten Neumann wrote:
> Hello Sebastian,
>
> Sebastian Knödel wrote:
>
>> Thanks for the fast reply.
>> But this doesn't work.
>> The materialgroup contains no material at that point.
>> So if I use mg->getMaterial() I receive always a NullFC.
>> But I unerstand the problem.
>> Somehow I have to add the shaderchunk to the OSGMaterial that holds the
>> original materialdata.
>>
>
> exactly.
>
>
>> But how can I access the Material of any loaded geometry and add my
>> shader chunk???
>>
>
> that depends a bit on what type of file your model is stored in. AFAIK
> the vrml loader uses material groups, but other loaders probably add the
> material directly to the geometry, i.e. you can get it by:
>
> GeometryPtr geo = Geometry::dcast(model->getCore());
> MaterialPtr mat = geo->getMaterial();
>
>
>> I tried something like
>>
>> if(model->getCore()->getType().isDerivedFrom(
>> ChunkMaterial::getClassType())){
>> mat = model->getCore();
>>
>
> mat = ChunkMaterial::dcast(model->getCore());
>
>
>> mat->addChunk(shaderchunk);
>> }
>>
>> any comment?
>>
>
> Material and hence ChunkMaterial is not derived from NodeCore, so the
> above test is always false.
>
> Hope it helps,
> Carsten
>
>
>> thanks
>>
>> Andreas Zieringer wrote:
>>
>>> Hi Sebastian,
>>>
>>> you are replacing the original material with your own shader material.
>>>
>>> replace this line:
>>>
>>> mg->setMaterial(createSimpleShaderMaterial());
>>>
>>> with something like this:
>>>
>>> ChunkMaterialPtr mat = ChunkMaterialPtr::dcast(mg->getMaterial());
>>>
>>> if(mat != NullFC)
>>> {
>>> beginEditCP(mat);
>>> mat->addChunk(_shl);
>>> endEditCP(mat);
>>> }
>>>
>>> Andreas
>>>
>>>
>>>
>>>> Hi there,
>>>>
>>>> I'm using different glsl shader (phong, etc.) to create different
>>>> visualizations of my models in my scene.
>>>> In my shaders I would like to use the original material properties resp.
>>>> textures that belong to the model and were loaded with the geometry from
>>>> file.
>>>>
>>>> When I load the tie fighter model I would like to use the original
>>>> material colors in my shader.
>>>> I tried to do so by using the built-in gl_FrontColor.diffuse in the
>>>> Vertex Shader and pass it through to the Fragment Shader.
>>>> But the gl_FrontColor (diffuse/ambient/specular) is all the time
>>>> (0.0,0.0,0.0,0.0)/black, meaning that its not available.
>>>> It seems that the OpenGL material isn't anymore valid for any reason
>>>> when I use a shader.
>>>>
>>>> Afterwards I tried to use the textures of the model in my shader. In
>>>> Performer the corresponding texture of the currently rendered geometry
>>>> was bind to texture unit 0. Thus it was easy to use the textures in the
>>>> shader. It seams that OpenSG binds the textures to different textures
>>>> units. Because when I used texture unit 0 in my shader, the wrong
>>>> textures were visualized with wrong parts of my model.
>>>> So my question is how to acces the textures in my shader, which were
>>>> loaded with the model? Because I don't know the exact texture units
>>>> OpenSG binds them to.
>>>>
>>>> Perhaps I don't set up the shader corrctly and the OpenGL State isn't
>>>> anymore available.
>>>>
>>>> I attached an example to show the problem.
>>>>
>>>> thanks for any comment.
>>>>
>>>> Sebastian Knödel
>>>>
>>>>
>>>
>>>
>> -------------------------------------------------------------------------
>> This SF.net email is sponsored by: Splunk Inc.
>> Still grepping through log files to find problems? Stop.
>> Now Search log events and configuration files using AJAX and a browser.
>> Download your FREE copy of Splunk now >> http://get.splunk.com/
>> _______________________________________________
>> Opensg-users mailing list
>> [email protected]
>> https://lists.sourceforge.net/lists/listinfo/opensg-users
>>
>>
>
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Splunk Inc.
> Still grepping through log files to find problems? Stop.
> Now Search log events and configuration files using AJAX and a browser.
> Download your FREE copy of Splunk now >> http://get.splunk.com/
> _______________________________________________
> Opensg-users mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/opensg-users
>
-------------------------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc.
Still grepping through log files to find problems? Stop.
Now Search log events and configuration files using AJAX and a browser.
Download your FREE copy of Splunk now >> http://get.splunk.com/
_______________________________________________
Opensg-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/opensg-users
