[osg-users] OverlayNode bug

Robert Osfield robert.osfield at gmail.com
Wed Sep 10 07:15:48 PDT 2008


Hi Mathieu,

I don't know the cause/or a solution to the problem, but in the case
of VIEW_DEPENDENT_WITH_PERSPECTIVE_OVERLAY a GLSL vertex and fragment
program is used to generate the results, so I'd guess that the shader
simply doesn't know about the texture blending required.   Have a look
into the implementation to see if you can get things work.

Robert.

On Wed, Sep 10, 2008 at 3:05 PM, Mathieu MARACHE
<mathieu.marache at gmail.com> wrote:
> Hi,
>
> I happened to be testing the OverlayNode with transparent nodes and came
> across a difficult to spot bug. There are in fact three techniques that you
> can assign to an OverlayNode :
>
> osgSim::OverlayNode::OBJECT_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY;
> osgSim::OverlayNode::VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY;
> osgSim::OverlayNode::VIEW_DEPENDENT_WITH_PERSPECTIVE_OVERLAY;
>
> Techniques 1 and 2 are producing expected results while technique 3 doesn't
> handle the transparency
>
> I haven't been able to spot where it goes wrong, I'm posting this in case
> someone has a hint to where the problem lies.
>
> --
> Mathieu
>
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