[osg-users] questions about developing drivers for osg/osgEarth

[Chris Hanson]

I'd like to help you a bit more, but I've been really slammed with another
osgEarth client this week. If you're patient, I can probably help you more
in a few days.

On Mon, Sep 23, 2019 at 2:03 PM speterson at idealaero.com <
speterson at idealaero.com> wrote:

> Got shaders to work on geometry’s now just took me getting totally
> frustrated and taking a walk it seems J
>
>
>
> osgEarth::ModelLayerOptions layerOptions("test polygon", geomOptions);
>
> osgEarth::ModelLayer* test = new osgEarth::ModelLayer(layerOptions);
>
> osg::StateSet* tss = test->getOrCreateStateSet();
>
> VirtualProgram* vp = VirtualProgram::getOrCreate(tss);
>
> vp->setName("imageLayer");
>
> myshaders shaders;
>
> shaders.load(vp, shaders.myimagecc_Vertex);
>
> shaders.load(vp, shaders.myimagecc_Fragment);
>
> _map->addLayer(test);
>
>
>
> Was the code to get it working had to apply it to the ModelLayer not the
> geometry and add some hooks into my shaders to keep the transparent parts
> the same.
>
>
>
>
>
> Now to figure out how to get the data to change for the shaders to act on.
>
>
>
>
>
> *From:* osg-users [mailto:osg-users-bounces at lists.openscenegraph.org] *On
> Behalf Of *Chris Hanson
> *Sent:* Thursday, September 19, 2019 10:29 AM
> *To:* OpenSceneGraph Users <osg-users at lists.openscenegraph.org>
> *Subject:* Re: [osg-users] questions about developing drivers for
> osg/osgEarth
>
>
>
> Ok. That helps a lot. Thanks.
>
>
>
> So, I theorize that you are loading a 2d vector field as a data layer,
> that represents the 2D wind velocity vector at every data grid point
> covering the area, and then you use some kind of shader to display that as
> a colorfield and displays the moving flow lines? And then you update the 2d
> vector map periodically to represent the current data?
>
>
>
> If that's the case, it sounds like you're just needing to load a
> conventional two-channel 2D image and do all the display work in shaders.
> That doesn't sound like how you're doing it though?
>
>
>
>
>
> There's nothing at all that is file-specific about osgEarth, its drivers
> or its data sources. Many of the drivers talk to network-based data sources
> without accessing local files, so those shouldn't be an issue.
>
>
>
> Glenn can probably comment better on how to best make a driver that
> updates itself periodically or on cue, but you ought to be able to just
> poll every 30 seconds or so and see if a data is available and refresh it
> somehow.
>
>
>
>
>
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-- 
Chris 'Xenon' Hanson, omo sanza lettere. Xenon at AlphaPixel.com
http://www.alphapixel.com/
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