Re: [Stellarium-pubdevel] Landscape improvements

[Georg Z. <geo...@un...>]

Dear Fabien,

thank you for these hints. I had thought already about trying the
subtraction, but hoped there was a direct way which I had overlooked.

These classes made my jaws drop during study, I can imagine they were
quite a lot of work.

The spurious line is a pity. Maybe I can analyze the vertex array and
remove clear faults? Let's see...

Kind regards,
Georg


On Fr, 8.11.2013, 22:21, Fabien Chéreau wrote:
> Hi Georg,
>
> On Fri, Nov 8, 2013 at 4:45 PM, Georg Zotti
> <geo...@un...>wrote:
>
>> Hi Bogdan and Fabien,
>>
>> I have the PolygonalLandscape almost working. Just one significant and
>> one
>> small problem, maybe Fabien can see&solve this in a minute or shed light
>> on the topic?
>>
>> The SphericalPolygon is filled around the zenith, not the ground. When I
>> reverse the polygon contours, nothing is rendered. I thought in this
>> case
>> StelPainter culls away everything, but disabling culling in
>> StelPainter::drawSphericalRegion() L1344 leads to other bizarre effects.
>> My SphericalPolygon would be something that obviously usually covers the
>> bottom half of the landscape sphere plus some mountains. Can I tell
>> SphericalRegion which pole it should include?
>>
>
> Maybe (I can't remember very well) creating a polygon from a contour
> expect
> the polygon to extend on less than 180 deg. Instead of reversing the
> contour, try to use the getSubtraction() method between the full sky
> polygon (AllSkySphericalRegion) and the one you have already.
>
> The other problem is that the edge line which I would also like to have
>> shows an extra line towards the zenith. No idea why or how to get rid of
>> it.
>>
>
> There used to be such bugs for very large areas (it was a huge pain to
> make
> those work at all). It's possible that some bugs were never completely
> fixed.
>
> Fabien
>
>
>>
>> G.
>>
>>
>> On Fr, 8.11.2013, 02:11, Georg Zotti wrote:
>> > Hi!
>> >
>> > I have the sampling working, and the Carte du ciel horizon is also
>> already
>> > properly parsed. I have created a new landscape class trying to use a
>> > SphericalPolygon, but it is not rendered yet. [...]
>> >
>> > Branch:
>> > https://code.launchpad.net/~georg-zotti/stellarium/landscape-addons
>> >
>> > Kind regards,
>> > Georg
>> >
>>
>>
>>