Thanx for the hints.
I want the model view matrix, i.e. the combination of an object's
model matrix and the camera's view matrix: for example the same that you
use in a Vertex Shader to transform the gl_Vertex in eye coordinates...
I tried with mgr->getCamera()->getViewing(..) and pass it through a uniform
but probably I still miss something because It gives me a flat shading
instead of the result I expected..
Erik
2008/11/18 Carsten Neumann <[EMAIL PROTECTED]>
> Hello Erik,
>
> Erik Podetti wrote:
> > Hi all,
> > I'm trying to implement a shader but to do this I need the
> > ModelViewMatrix from the simplesceneManager camera (that is a
> > PerspectiveCamera). What I'm trying to do is to collect a series of
> > positions (coordinates) of source lights in a texture via a MRT and FBO.
> > But while gl_SourceLight[n].position is automatically multiplied for the
> > correct modelViewMatrix, when I use a PolyForeground to project my
> > texture I loose that matrix.
> > Simply I need to save a ModelViewMatrix from a point of view and reuse
> > it in another shader...So I tought to take the modelviewmatrix from the
> > mgr->getCamera()
>
> do you want the model view matrix, i.e. the combination of an object's
> model matrix and the camera's view matrix or do you just need one of these?
>
> To get the camera's viewing matrix you can do this:
>
> Matrix matV;
> mgr->getCamera()->getViewing(matV);
>
> To get an object's model matrix you can do:
>
> Matrix matM;
> someNode->getToWorld(matM);
>
> You can pass these or a combination of them as uniforms to your shader.
>
> If you need the model or viewing matrix while rendering the scenegraph
> (not the foreground) you can also add the "magically" named uniforms
> "OSGWorldMatrix" and "OSGViewMatrix" to your SHLChunk and get these
> values passed to the shader.
>
> > but I didn't succeded in trasforming it to a MatrixCamera.
>
> MatrixCamera and PerspectiveCamera are siblings (both children of
> Camera) in the inheritance hierarchy, so there is not way to cast
> between them (other than brute force, but that won't give meaningful
> results here ;) ).
>
> Hope it helps,
> Carsten
>
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's
> challenge
> Build the coolest Linux based applications with Moblin SDK & win great
> prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> Opensg-users mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/opensg-users
>
-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/
_______________________________________________
Opensg-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/opensg-users
