Stellarium
Lunar eclipse affects the unlit side of the Moon
This is a rarely seen limitation, but I thought I might report it anyway.
Lunar eclipses affect the non-illuminated side of the Moon. This is unrealistic, as the sunrays cannot reach those parts of the Moon during a lunar eclipse, and thus they should remain in total darkness. This is only visible from space, which is why this is a rarely seen limiation. See the screenshot below.
A similar limiation is that the Earthshine is visible evenly across the non-illuminated lunar surface, even the parts from which the Earth is invisible. See the screenshot below. This is also only visible from space.
Funny perspectives. Yes, the unilluminated side of the Moon which also points away from Earth should be black when seen from some "observer". From Earth you never see this issue.
The earthshine is modelled as "ambient" light component in the classical OpenGL model, so this is not directional. It is a limitation I have learned to live with.
It is a limitation I have learned to live with.
Isn't it an artificial limitation? We can just add another uniform to show direction to the Earth and use the BRDF twice instead of once.
@10110111 if you can do that, please go ahead. For me the focus of this program is still earth-bound simulation.
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Maybe helpful: https://onlinelibrary.wiley.com/doi/pdf/10.1111/cgf.70017
Yeah, I do have a plan to add refraction support to CalcMySky/ShowMySky, and even have made some progress, but it's still far from completion. The Earth's rim does look similar to figure 11 in this paper indeed.
@alex-w Note though, that this physically-based rendering needs a proper tone mapper instead of the bunch of ad hoc hacks that we have for objects' brightnesses and hues.
Maybe helpful: https://onlinelibrary.wiley.com/doi/pdf/10.1111/cgf.70017
Yeah, I do have a plan to add refraction support to CalcMySky/ShowMySky, and even have made some progress, but it's still far from completion. The Earth's rim does look similar to figure 11 in this paper indeed.
If this is the approach we're going for, maybe we could also solve the remaining parts of #483 at the same time.
maybe we could also solve the remaining parts of #483 at the same time
Sure. Adding alien atmospheres should be easier than adding refraction and sourcing the look of the planet's atmosphere when rendering the surface of its satellite. But again, this needs attention at the relative brightness of the surface and the atmosphere (as well as extinction applied to the surface's color), and, ideally, a good tone mapper.
Concerning the behaviour of light interacting with the Moon : have also a look at #1804
