[Interest] Qt3D filtering for different renderviews

[Juan José Casafranca]

One solution I though about was to inherit from QEntity and in the 
constructor, add the parent QLayer component. 

That way I have the recursive solution and as long as I use the new entity 
class I don't have to do anything special. 

@Sean: Have a look at the suggestion I posted in the JIRA (https://
bugreports.qt.io/browse/QTBUG-59814). I think an approach based on the 
QLayerFilter may be more powerful than making QLayer recursive. 

On jueves, 30 de marzo de 2017 10:47:33 (CEST) Sean Harmer wrote:
> Hi,
> 
> On Thursday 30 March 2017 02:28:29 Juan José Casafranca wrote:
> > Hi,
> > 
> > Im building a simple default viewer using Qt3D for a design tool. I'm
> > trying to add a typical gradient background and for that I'm using the
> > following approach.
> > 
> > I have create a custom framegraph with 2 renderviews.
> > The first renderview clears the buffers, select an ortographic camera and
> > have a layerfilter (background).
> > The second renderview is the default forwardrenderer framegraph but I have
> > change the clearbuffers to DepthBuffer only so it doesn't delete the
> > background.
> > 
> > The framegraph works fine, but I'm having a little issue. The background
> > is
> > a QPlaneMesh where I have added a color attribute so I can use the
> > QPerVertexColorMaterial and the background layer so it's the only entity
> > viewed by the first renderview. But the second renderview also see this
> > entity and is painting it.
> > 
> > How can I make the second renderview to skip the background entity? I have
> > tried to add a LayerFilter for it, but that way I have to add a Layer
> > component to each object in my scene, which is not practical.
> > 
> > Any idea?
> 
> Yes, we'd like to make this support recursive filtering as an option. For
> now, it's not that hard to add the layer component to all other entities.
> Create the layer component once somewhere, perhaps in the framegraph or
> somewhere else that is readily accessible in your application (perhaps some
> scene or application state object) and export that to QML (if using QML).
> You can share the same QLayer object between all Entity's.
> 
> Cheers,
> 
> Sean
> 
> > Thanks!!
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