Background Stars colour - bug?

[DaddyHoggy]

EV posted a couple of pics here: https://bb.oolite.space/viewtopic.php?f= ... 42#p165042

I noticed the background star scape takes on the colouration of the in system sun. That has to be a bug doesn't it?

[Eric Walch]

EV posted a couple of pics here: https://bb.oolite.space/viewtopic.php?f= ... 42#p165042

I noticed the background star scape takes on the colouration of the in system sun. That has to be a bug doesn't it?

I think the color sensors of the camera are compensating for the main color, so it is explainable that star color differs from system to system. But, than it should be the complementary color of the sun, and not the sun color itself.

[Greyth]

I thought stars, regardless of type, emit white light?

[JazHaz]

I thought stars, regardless of type, emit white light?

No, they do give everything a reflected colour, depending on the star. However the background stars shouldn't also have that hue. I'm not sure if its a bug, I can't remember what previous versions did.

[Greyth]

Quite so, having looked it up, stars do indeed emit coloured light. The human eye, however, is relatively insensitive to colour emanating from a point source. So, background stars should be white?

[Commander McLane]

Quite so, having looked it up, stars do indeed emit coloured light. The human eye, however, is relatively insensitive to colour emanating from a point source. So, background stars should be white?

Not at all. Just look up to the sky at night, and you'll see that the stars are not all white.

[snork]

Quite so, having looked it up, stars do indeed emit coloured light. The human eye, however, is relatively insensitive to colour emanating from a point source. So, background stars should be white?

I don't think it is to do with point source, but with the low luminance of stars (other than Sol) seen from earth.

[human eye :] Scotopic vision occurs at luminance levels of 0.01 to 0.000001 cd/m².

clear sky at night (no moon) : ~ 0.001 cd/m²

For the game : Why should I suddenly care about "realistic representation of reality" ?
As long as it adds flavour / looks good - fine with me.

Maybe in El Viejo's ship the screens are faultily calibrated for Lobsteroid Vision ?

[JensAyton]

I noticed the background star scape takes on the colouration of the in system sun. That has to be a bug doesn't it?

They don’t, and it isn’t. The stars have a range of colours (linear in RGB space) that’s selected randomly per system, separate from the sun colour; this has always been the case. This is a design decision from before my time. :-) The nebulae are supposed to use the same range of colours as the stars, but due to a long-standing [wp]misbug[/wp] they actually use a much wider range often covering the whole spectrum.

(Given the relatively abstract graphics of vanilla Oolite, this strikes me as less strange than the fact that neighbouring systems have completely different arrangements of stars and nebulae.)

[Cody]

the fact that neighbouring systems have completely different arrangements of stars and nebulae.

I don't even want to think about that.

So some systems having all their stars the same colour is normal, yes?

[SandJ]

(Given the relatively abstract graphics of vanilla Oolite, this strikes me as less strange than the fact that neighbouring systems have completely different arrangements of stars and nebulae.)

You only think that because in Real Life™ you have only seen pictures taken from cameras & telescopes wihin a small part of Sol's system. Once you start seeing pictures taken from a different perspective, the true nature of these supposedly distant 'nebulae' will become obvious.

Just as we think it is a long way between Earth and Sol, once we actually get into space properly, we will better relate to the distances involved and appreciate that Oolite's physics is actually accurate - it's just our primitive and parochial experience that incorrectly tells us otherwise.

Next you'll be claiming faster-than-light travel is impossible and that the speed of light in a vacuum is a constant!

[DaddyHoggy]

I noticed the background star scape takes on the colouration of the in system sun. That has to be a bug doesn't it?

They don’t, and it isn’t. The stars have a range of colours (linear in RGB space) that’s selected randomly per system, separate from the sun colour; this has always been the case. This is a design decision from before my time. The nebulae are supposed to use the same range of colours as the stars, but due to a long-standing [wp]misbug[/wp] they actually use a much wider range often covering the whole spectrum.

(Given the relatively abstract graphics of vanilla Oolite, this strikes me as less strange than the fact that neighbouring systems have completely different arrangements of stars and nebulae.)

I was referring to the screenshots posted by El Viejo here: https://bb.oolite.space/viewtopic.php?f= ... start=2970 where ALL the stars appear green (with a green main star) or ALL pink (with a pinkish main star) that's why I was wondering if something odd had been introduced with 1.76 (I don't have access to 1.76 at the moment to check) - but I always remembered a distinct spread of colours in back ground stars I've never seen it where all the stars are one colour and yet EV posted images where it happened twice.

[JensAyton]

I was referring to the screenshots posted by El Viejo here: https://bb.oolite.space/viewtopic.php?f= ... start=2970 where ALL the stars appear green (with a green main star) or ALL pink (with a pinkish main star)

If you look again, Esusale’s actually range from green to yellow. But I was wrong about the colours being independent; the sun is actually a paler version of the midpoint between the two star colours. In any case, this hasn’t changed recently.

[DaddyHoggy]

Thanks for clarifying, and yes, when looking closer (and in fact using GIMP to get the RGB attributes) there's a definite range of colours there. [I'll feebly blame my LCD monitor and viewing angle distortion]

[Greyth]

I don't think the coloured stars look quite right and would be better if mainly white with a few coloured ones... but as you say snork, what does that matter? Not at all.

[Smivs]

http://imgsrc.hubblesite.org/hu/db/imag ... ge_web.jpg

Plenty of nice colours there