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 Post subject: Re: TRAPPIST-1
PostPosted: Tue, 28-02-17, 17:25 GMT 
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Looks pretty good!

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 Post subject: Re: TRAPPIST-1
PostPosted: Tue, 28-02-17, 18:00 GMT 
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Location: N 42.38846 W 83.45456
two possible heightmaps
They still need to have erosion processes added

B
Image


and F
Image

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 Post subject: Re: TRAPPIST-1
PostPosted: Tue, 28-02-17, 18:43 GMT 
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Hi John,

many thanks for your two impressive landscapes! For planet f it seems to me that the heightmap makes the terrain look more like a rocky one, rather than an icemap. So my question would be whether you could imagine making a real ice texture, where every child can see that it is ice with cracks, specular effects and all that?

@problem=> solved by downloading your heightmap for b again...

Thanks,
Fridger

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 Post subject: Re: TRAPPIST-1
PostPosted: Tue, 28-02-17, 19:22 GMT 
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Location: N 42.38846 W 83.45456
these are rgb normalized images from a 32 bit float , they will look bumpy

on F i was planning on a lot of glacial ice
The water would circulate from the subsloar to the post solar and back
The system is still young so the rather small metal core would still be generating a magnetic field and keep an atmosphere ? maybe?

and on B the highland craters NEED to be erosion filled a bit
this is a venus like but without an atmosphere

C

i am thinking a venus/mars like dry and warm

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 Post subject: Re: TRAPPIST-1
PostPosted: Tue, 28-02-17, 20:56 GMT 
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http://www.vendian.org/mncharity/dir3/starcolor/

http://www.vendian.org/mncharity/dir3/s ... rsD58.html

uses a Sun-like "D58" whitepoint (Version 2005-Nov-17)

(V) = V main-sequence stars (dwarfs)

Code:
         X      Y      R   G   B     HEX
M8(V)  0.4276 0.4176  255 209 121  #ffd179


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 Post subject: Re: TRAPPIST-1
PostPosted: Wed, 01-03-17, 10:17 GMT 
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Note: this is a purely experimental activity... ;-)

Just to motivate JohnVV a bit about a "real" iceplanet f, I "stole" a 2k x 1k rectangle of beautiful ice surface from a hires photo (3812 x 3237) of the Enceladus moon (that also posesses an atmosphere and a sub-ice (water) ocean!). Easy GIMP manipulations then led to this 2k texture for planet f (just retaining the melted ocean from Andrew's povray texture):

Attachment:
iceplanet_encel.jpg
iceplanet_encel.jpg [ 461.7 KiB | Viewed 689 times ]

https://3c1703fe8d.site.internapcdn.net ... sicymo.jpg

Here are a few test shots:
The reddish specular reflection of TRAPPIST-1 is from my yesterday's analysis, here
viewtopic.php?f=17&t=828&start=60#p14733
[click on images followed by hitting the fullscreen key (FF=> F11)]
Attachment:
icepl_encel1.jpg
icepl_encel1.jpg [ 72.34 KiB | Viewed 689 times ]

Attachment:
icepl_encel2.jpg
icepl_encel2.jpg [ 95.58 KiB | Viewed 689 times ]

Attachment:
icepl_encel3.jpg
icepl_encel3.jpg [ 118.82 KiB | Viewed 689 times ]


Last not least I have also generated a "selfie" heightmap ;-) which then makes up for this:
Attachment:
icepl_encel_hmap.jpg
icepl_encel_hmap.jpg [ 108.43 KiB | Viewed 686 times ]

Hmm...

Enjoy,
Fridger

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 Post subject: Re: TRAPPIST-1
PostPosted: Wed, 01-03-17, 12:47 GMT 
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I'm not sure a planet with an atmosphere and the presumably fairly thin ice caps over the water ocean would support that much topology, still less craters (although they look like most of them are safely hidden on the night side). If basing the texture on a solar system ice moon, I'd probably go with Europa rather than Enceladus.


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 Post subject: Re: TRAPPIST-1
PostPosted: Wed, 01-03-17, 13:03 GMT 
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ajtribick wrote:
I'm not sure a planet with an atmosphere and the presumably fairly thin ice caps over the water ocean would support that much topology, still less craters (although they look like most of them are safely hidden on the night side). If basing the texture on a solar system ice moon, I'd probably go with Europa rather than Enceladus.


I agree, Andrew. Just felt that it was good to see how real ice surfaces look in the TRAPPIST-1 environment (reddish light etc). One then has a concise basis for comparing with povray - generated ice...or with JohnVV's approach. See also the remark I made on top of my previous post ;-) .

Fridger

PS: I suppose you noted my rather detailed analysis about SpecularColor?
viewtopic.php?f=17&t=828&start=60#p14733
Actually, would you know how the size of a star's specular reflection spot in the sea depends on the star's distance and other parameters? What fixes physicswise e.g. SpecularPower?
These features must be calculable. I would start with the intercept theorem but there is clearly more to it...

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 Post subject: Re: TRAPPIST-1
PostPosted: Thu, 02-03-17, 5:53 GMT 
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this is what i was thinking of for F


Image Image Image Image

and this is the same test heightmap i posted earlier

the heightmap above is a 8 bit normalized copy of the 32bit float

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 Post subject: Re: TRAPPIST-1
PostPosted: Thu, 02-03-17, 18:39 GMT 
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Hi John,

many thanks for your work. My little problem is currently to find out what the most conspicuous ice surface would look like, given that the colors are strongly modified by the redish light of TRAPPIST-1. The guiding idea being to display few but most characteristic features on each of the seven planets.

Your 4k surface looks quite nice, yet it could typically also refer to a rocky / mountaneous snow-covered scenario. See also Andrew's previous comment about my attempt of "steeling" some Enceladus ice;-). Furthermore, while your greenish color of planet f's ocean looks appealing, it strongly pulls the specular reflection in the ocean from red to orange. You increased the size of the ocean, which is a priori fine, but lets the user see much less of the planet's surface. So what?

Cheers,
Fridger

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 Post subject: Re: TRAPPIST-1
PostPosted: Fri, 03-03-17, 14:10 GMT 
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Thank you for the new information and ideas! Great topic! I'm very much into creating a realistic TRAPPIST-1 add-on, but I have many questions and problems...

My interpretation of TRAPPIST-1f (with landmasses):

Attachment:
TRAPPIST-1f-newbump.png
TRAPPIST-1f-newbump.png [ 2.2 MiB | Viewed 626 times ]


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 Post subject: Re: TRAPPIST-1
PostPosted: Fri, 03-03-17, 14:14 GMT 
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My first problem is that it is not a relatively small moon, it is a planet. So ice fields and cracks should look, well, small?


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 Post subject: Re: TRAPPIST-1
PostPosted: Fri, 03-03-17, 15:20 GMT 
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sjohn wrote:
Thank you for the new information and ideas! Great topic! I'm very much into creating a realistic TRAPPIST-1 add-on, but I have many questions and problems...

My interpretation of TRAPPIST-1f (with landmasses):

Attachment:
TRAPPIST-1f-newbump.png


Not bad sJohn! But I have seen this image already in the Russian Celestia forum by a user John71. So I guess the same person uses a different name for each forum ...I think your ice from Enceladus looks better than my ice from Enceladus above. And incidentally, it's not a bad idea to properly quote me over there for "steeling" first some of Enceladus' ice ;-). Never mind...

Cheers,
Fridger

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 Post subject: Re: TRAPPIST-1
PostPosted: Fri, 03-03-17, 19:44 GMT 
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Thanks. I guess. :rool: And yes, I'm the same person. But come on, that's not a Russian forum! Don't scare me! :)


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 Post subject: Re: TRAPPIST-1
PostPosted: Fri, 03-03-17, 19:47 GMT 
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By the way I used a different Enceladus texture from here:

https://astrogeology.usgs.gov/search/map/Enceladus/Cassini/Enceladus_Cassini_mosaic_global_110m


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