Hello Johannes,
On 2017-03-08 00:36, Johannes Brunen wrote:
> I'm playing around with the DepthPeelingStage and have written a simple
> example. For that I have taken the testDepthPeeling.cpp and merged it
> with the shaderstoragebufferobject_std430.cpp example. I have done this
> because I would like to have an example that uses transparent and opaque
> geometry and that uses the more elaborate shader code. The example is
> working somehow, but what I do not get right so far, is that the
> transparent geometry is correctly blended with the opaque geometry.
hmm, I haven't written the DepthPeelingStage and don't know its details
well enough - or rather I don't know it at all
> In extension to the attached example I also added the following code
> lines into the example:
>
> geom1_state->setTransparencyMode(OSG::Material::TransparencyForceTransparent);
> geom6_state->setTransparencyMode(OSG::Material::TransparencyForceTransparent);
>
> This, however does also not bring the desired correct rendering.
I'm afraid I have no idea what that does, I can't recall ever having
seen a transparency mode enum :(
> Is it even possible to mix opaque and transparent geometry with the
> DepthPeelingStage core or is the stage incomplete with respect to that task?
I guess that is a possibility.
> How do I have to handle the task of differing actions with respect to
> transparency in a stage implementation at all?
>
> How is blending of transparent and opaque rendering performed in the
> common case?
Transparent objects are rendered after opaque ones in back to front
order (IIRC using the bounding box center).
> Could you please take a look into the example and give me some hint what
> I'm doing wrong here?
>
> Additionally, I have tried to setup the HDR2 stage above of the
> DepthPeeling stage in another example. With that I do not get any
> rendering. If I replace the HDR2 stage or the DepthPeeling stage by a
> simple Group core I got the expected rendering for the particular stage.
> Do you have any idea what is missing in that scenariowhere both stages
> are active?
Not specifically, sorry. In general I would suspect it has something to
do with the FBOs/Attachments the stages are rendering into and how they
perform clearing.
Cheers,
Carsten
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