Hello Carsten,
Thanks a lot! this is exactly what I needed!! :)
best regards,
Victor
On Tue, Nov 4, 2014 at 6:30 PM, Carsten Neumann <carsten.p.neum...@gmail.com
> wrote:
> Hello Victor,
>
> On 11/04/2014 06:17 PM, Victor Haefner wrote:
> > the gl_ProjectionMatrix allows me to compute the up and right vector in
> > view coordinates.
> > vec4 right = gl_ProjectionMatrix*vec4(1,0,0);
> > vec4 up = gl_ProjectionMatrix*vec4(0,1,0);
> > I can use those vectors to create a nice quad in the geometry shader.
> > The problem is when using head tracking (OSGProjectionCameraDecorator).
> > The orientation of the head messes with the gl_ProjectionMatrix, and
> > thus with the shape of my quad.
> > I essentially just need the aspect ratio of the viewport in my shader.
> > Passing it as a variable is not possible (I think?) because I have a
> > cluster environment, multiple viewports, with different aspect ratios...
>
> you can use one of the 'magic' OpenSG variables:
> uniform vec2 OSGViewportSize;
>
> see Source/State/Shader/Variables/OSGShaderVariableOSG.{h,cpp} and
> ShaderProgram::addOSGVariable()
>
> Cheers,
> Carsten
>
>
> ------------------------------------------------------------------------------
> _______________________________________________
> Opensg-users mailing list
> Opensg-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/opensg-users
>
------------------------------------------------------------------------------
_______________________________________________
Opensg-users mailing list
Opensg-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/opensg-users
