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General SE questions
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| SpaceEngineer | Date: Thursday, 02.05.2013, 22:07 | Message # 136 |
 Author of Space Engine
Group: Administrators
Russian Federation
Messages: 4800
Status: Offline
| Added these two in the buglist (ignoring of the FOV then choosing default ship position and problems with releasing left+right click) 
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| Vinny | Date: Friday, 03.05.2013, 03:31 | Message # 137 |
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Explorer
Group: Users
United States
Messages: 172
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| Hi, guys!
I don't know if this has been asked before, does everything in space engine like comets, planets, ect. move around in space in space engine? Thanks!
Cheers,
Vincent
Edited by Vinny - Friday, 03.05.2013, 03:32 |
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| Watsisname | Date: Friday, 03.05.2013, 05:01 | Message # 138 |
 Galaxy Architect
Group: Global Moderators
United States
Messages: 2613
Status: Offline
| I have a question regarding the density of the atmospheres of procedural planets -- how is it calculated?
I started thinking about this when I came across a desert planet with 363 atmospheres of pressure, and in the info/wiki box (select the planet and press "I"), the air density was listed at 28g/cm3. That's really dense, even more so than solid gold! Granted it's under enormous pressure, but still, it struck me as odd.
After checking out multiple planets this seems to be a common theme, with air densities typically being higher than their solar-system counterparts. I made a small plot of log(pressure) and log(density) for solar system bodies and some procedural planets to visualize. Air density is in red, pressure is in blue, and solar system planets (Earth, Mars, Venus, Titan) are the cluster of four on the left, and the procedural planets are on the right.
Solar system bodies consistently have air density 2 to 3 orders of magnitude less than the surface pressure, but this does not appear to hold true for the procedural ones.
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| midtskogen | Date: Friday, 03.05.2013, 07:39 | Message # 139 |
 Star Engineer
Group: Users
Norway
Messages: 1674
Status: Offline
| Quote (Watsisname) the air density was listed at 28g/cm3
If the air density is that high, what's the overall density of the whole planet?
Let's say that a rocky planet like that could form, what would happen if it had a volcanic eruption - molten lava would bubble up into the air and form rock floes drifting around the planet in the upper atmosphere?
NIL DIFFICILE VOLENTI
Edited by midtskogen - Friday, 03.05.2013, 07:41 |
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| Watsisname | Date: Friday, 03.05.2013, 08:22 | Message # 140 |
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Galaxy Architect
Group: Global Moderators
United States
Messages: 2613
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| Good question. The planet density is 11.5g/cm3, or twice that of Earth's. So yeah... if these were real numbers then rocks would float at some height above the ground where the densities balanced. Even lead would float. wat 
The planet is
RS 0-9-88682100-108-2-9-90502765-27 3.1
by the way; it's a hot desert super-earth with ~6.7 earth masses and ~3 times the surface gravity.
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| SpaceEngineer | Date: Friday, 03.05.2013, 08:53 | Message # 141 |
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Author of Space Engine
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Russian Federation
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| Don't expect precise calculation of air density, as long as chemical composition of the atmosphere did not modeled. If I remember correctly, density calculated from pressure as simple formula, so it must produce incorrect result. For real planets you may specify any density and any pressure in the script.
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| midtskogen | Date: Friday, 03.05.2013, 09:55 | Message # 142 |
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Star Engineer
Group: Users
Norway
Messages: 1674
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| A quick fix to the formula could be to add the planet density as a parameter, so that air density can only approach planet density. E.g. Dair' = Dair × Dplanet / (Dair + Dplanet)
May still lead to odd values, but should at least eliminate absurd values. In this case the air density would become 8.2 g/cm³. Iron would still float, though.
NIL DIFFICILE VOLENTI
Edited by midtskogen - Friday, 03.05.2013, 09:59 |
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| apenpaap | Date: Friday, 03.05.2013, 15:32 | Message # 143 |
 World Builder
Group: Users
Antarctica
Messages: 1063
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| Why does SE's Earth have a molten North Pole?
I occasionally stream at http://www.twitch.tv/magistermystax. Sometimes SE, sometimes other games.
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| HarbingerDawn | Date: Friday, 03.05.2013, 15:44 | Message # 144 |
 Cosmic Curator
Group: Administrators
United States
Messages: 8717
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| Quote (apenpaap) Why does SE's Earth have a molten North Pole?
If you mean having water as opposed to ice, then it's because the Earth texture doesn't show sea ice, only land ice.
All forum users, please read this!
My SE mods and addons
Phenom II X6 1090T 3.2 GHz, 16 GB DDR3 RAM, GTX 970 3584 MB VRAM
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| apenpaap | Date: Friday, 03.05.2013, 16:31 | Message # 145 |
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World Builder
Group: Users
Antarctica
Messages: 1063
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| I see. So why does it not show sea ice?
I occasionally stream at http://www.twitch.tv/magistermystax. Sometimes SE, sometimes other games.
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| HarbingerDawn | Date: Friday, 03.05.2013, 16:34 | Message # 146 |
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Cosmic Curator
Group: Administrators
United States
Messages: 8717
Status: Offline
| Quote (apenpaap) So why does it not show sea ice?
You'll have to ask NASA.
All forum users, please read this!
My SE mods and addons
Phenom II X6 1090T 3.2 GHz, 16 GB DDR3 RAM, GTX 970 3584 MB VRAM
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| midtskogen | Date: Friday, 03.05.2013, 16:37 | Message # 147 |
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Star Engineer
Group: Users
Norway
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| Perhaps James Hansen made it. 
NIL DIFFICILE VOLENTI
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| smjjames | Date: Friday, 03.05.2013, 17:51 | Message # 148 |
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World Builder
Group: Users
United States
Messages: 913
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| I'm probably mixing up what Dan Dixon said with what Space Engineer might have said, but didn't Space Engineer say something about putting in the ability to choose the measurement (Kelvin, Celsius, Fahrenheit) that that we want to display?
Although given the range of temperatures, using Kelvin is probably more elegant or something.
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| NyxKordel | Date: Friday, 03.05.2013, 17:59 | Message # 149 |
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Observer
Group: Newbies
United States
Messages: 5
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| Forgive me if this has been asked. I have tried to search for a topic that covers my question, but have had no luck. How do you edit the "info" of a planet you name in the Wiki? The block will not let me select it.
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| HarbingerDawn | Date: Friday, 03.05.2013, 17:59 | Message # 150 |
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Cosmic Curator
Group: Administrators
United States
Messages: 8717
Status: Offline
| Quote (smjjames) didn't Space Engineer say something about putting in the ability to choose the measurement (Kelvin, Celsius, Fahrenheit) that that we want to display?
Yes he said he plans to implement that.
All forum users, please read this!
My SE mods and addons
Phenom II X6 1090T 3.2 GHz, 16 GB DDR3 RAM, GTX 970 3584 MB VRAM
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