Re: [udig-dev] Rendering Artifacts with Anti Aliasing

[Emily Gouge <egouge@xxxxxxxxxxxxxxx>]

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Hi Andrea,

Unfortunately I am not allowed to share this data; and I have not yet 
been able to reproduce it with data I can share.  I will try a bit 
harder on that today.

I think this is either a geotools or Java issue as I tried this using 
just the geotools and saw the same effects (see attached).  The 
artifacts move as you zoom in/out and disappear entirely if you zoom in 
far enough.  If you extract out one geometry and render just that 
geometry it is not a problem.

Emily





On 19/06/2014 12:00 AM, andrea antonello wrote:
> > When I render a linear shapefile (moderate size; lots of overlapping
> > features) with anti-aliasing ON (render1.png) there is a collection of
> > horizontal line artifacts.  When I turn anti-aliasing OFF (render2.png)
> > these disappear.
> >
> > Is this expected?  Can anyone tell me why this happens? For some reason I
> > think I've seen this before but I cannot find anything on it.
>
> This is quite strange, can you supply a better zoom for this?
> The left one doesn't look like having much antialiasing from the image.
>
> Or can you share the dataset, I would give it a try.
>
> Cheers,
> Andrea
>
>
>
> > Thanks,
> > Emily
> >
> >
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Attachment: antialiasing.png
Description: PNG image