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.
> 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.
Cheers,
Carsten
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