using UE5.7:
created with wizard google maps tile set.
set cesium geo reference to true north (geocentric)
the sun rises in the south and sets in the north.
tried to find a way to fixed it. no luck.
Hi @Tamir_Offek, welcome to the forum!
Could you outline the exact steps you took to recreate this? I tried:
- Add GP3DT and set georeference latitude to 90, longitude 0. This places the origin on true north
- I could change the month/day and timezones and it appears the sun is in the correct position.
Are these the steps you took?
Thanks for the follow up
uploading images to explain
in this case i’m using bing imagery but it happens in any source of tileset.
all i did is to change mode from base LLA to true north
Hey @Tamir_Offek ,
This seems to be a known issue based on this github issue. I would note that we don’t recommend using true origin mode (line 18 here) for most use cases.
What is your use case, does it require true origin? It would be useful to know so we can better advocate for the fix internally.
I will link to this topic on github to express interest in the issue.
Thanks for posting on the forum!
I would recommend working around this issue by creating a second georeference and setting the CesiumSunSky to use that georeference instead. You can then place that georeference wherever you want to treat as the center (in terms of correct sun placement) and still use the original georeference in true origin mode. Though I would recommend not using a global tileset in true origin mode, it’s meant for situations where the tileset itself isn’t properly georeferenced.
for several reasons I need all the elements in the level to be aligned to geocentric mode (true north).
does cesium aware of this bug?
I need it in order to to get two far points on the globe to use the same axis system and this system should still be correct for both points. if you are using cartographic mode (with base LLA) points that are far from the base LLA use incorrect local axis system that gets increasingly erroneous as the point distance from base LLA is increasing.
Have you tried azrogers solution? I think that’s a great place to start, let us know if you run into any issues with that, thanks!
hi darcyvdd.
this solution is not applicable for me.
cesium is one part of an entire complex level with self developed plugins and complex scenario. accuracy is crucial and no part of the scenario can use base LLA method due to its inherent inaccuracy over long distances.
I guess cesium is aware of this bug.
are there any plans to fix it?
thanks.
@Tamir_Offek What inaccuracy are you running into with long distances when using the method I suggested (using two georeferences)? This should not affect any other calculations you do, it should only affect the positioning of the sun - and I don’t think there are accuracy issues with LLA regardless.