Hi,
On Wed, 2009-06-17 at 21:44 -0500, Carsten Neumann wrote:
> Hi Gerrit,
>
> Gerrit Voß wrote:
> > On Wed, 2009-06-17 at 19:52 -0500, Carsten Neumann wrote:
> >> I think I've figured out why sometimes procedural variables on shaders
> >> are not updated correctly (at least for 2; reports about the same
> >> problem in 1.x are still unsolved unfortunately): In
> >> DrawEnv::activateState() line ~340 there is this test:
> >>
> >> if(pNewState != _pActiveState ||
> >> pNewStateOverride != _pActiveStateOverride )
> >> {
> >> changeTo(...);
> >> }
> >>
> >> If only have example scenes that use OSG_ENABLE_NEW_SHADER=OFF and use
> >> SHLChunk, but I don't see anything that would make it better for the new
> >> shader infrastructure as that also relies an changeFrom being called
> >> regardless of a change being necessary.
> >
> > hmm, might be, let me check it for the new infrastructure, just so I'm
> > sure, we are looking at identical states with proc var that should
> > change the values,
>
> yes, basically two geometries that share the same material, so you get
> the same state.
>
> > e.g. containing something like OSGViewMatrix and
> > the objects having difference transformations.
>
> yes, or OSGWorldMatrix - not sure of OSGViewMatrix changes between
> objects, I always think of the view matrix as the inverse camera beacon
> transform, but I might be mixing up the definitions here.
;) to much OpenGL somehow I still have view as modelview ;)
> > Hmm, started but it looks like something else is not quite
> > right. Let me dig around a little.
>
> The reason I think this also affects the new stuff is because it is
> before that actually gets a chance, i.e. the DrawEnv::activateState
> short circuits the state change before it gets to any infrastructure
> specific code. There is also a bug in SHLChunk::changeFrom, see the
> "Graph operators & OSG shader variables" thread on the users list for a
> patch.
unfortunately there is more wrong. My quick test gives me weird results
such as switched of lights where they should not. So I guess I have to
dig a little more ;)
bis denn
gerrit
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