Difference between revisions of "Planet"

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Overview

Planets are destructible voxel objects with their own Gravity field, atmosphere, vegetation, and hostile life. They are similar to Asteroids in they contain fully destructible voxels, and have randomly generated Ores but that's where their similarities end. Planets range in size from 19km to 120km in diameter. By default, each planet comes with it's own accompanied Moon, unless manually spawned in by a player. Moons and Planets are exactly the same objects technically and are very similar in practice, with a few key differences being: Moons are much smaller often only 38 km in diameter and possess much weaker gravitational fields - down to 0.25 G.

Much like Asteroids they are completely immobile and never will move no matter how much force is applied, and are themselves not in anyway affected by gravity. If two planets were spawned very close to each other inside both of their gravitational fields, niether of them would ever fall into each other and meet. Although objects would experience some very strange gravitational effects from both of them.

Surface Generation

While their surface appears randomly generated, they're in fact pre-loaded voxel models. There is no procedural generation with Planets or Moons. When the size of the Planet is increased, it actually stretches the models to accommodate for the new size. The textures and vegetation aren't stretched, only the surface model is. Each planet type Earth, Mars, and Alien will spawn the appropriate models and surface textures associated with them. The same properties are applied even when it is spawned in manually by the player via (default) - SHIFT+F10 in Creative Mode.

Ore Generation

Cobalt Ore	Gold Ore	Ice	Iron Ore	Magnesium Ore	Nickel Ore	Platinum Ore	Silicon Ore	Silver Ore	Stone	Uranium Ore
Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes

Surface

(~15 to ~50 Meters): Large horizontal veins of ores with a thickness of a few meters. Each ore patch usually contains 1 to 4 ores. Different ores of the same patch can be found in different height levels. The surface above the ore patches is slightly darker and in a brown-ish color, so they can be easily spotted from a higher position. Dense Grass can make spotting harder. All ice lakes on the surface of a planet contain Ice ores.

Boulders

The ore is hidden inside stone rocks that are spread randomly over the surface. Boulders are all about the same size, they contain about ~20,000 of rare ores up to ~100,000 of iron ore. Under certain conditions, the positions of non-drilled boulders are reset completely, so GPS-Markers on these rocks become void. The rocks are also voxel entities that are separate from the planets voxels. They do overlap the planet in the way that station blocks do.

Atmosphere

Different planets have different atmosphere densities. All thrusters behave differently in a planets atmosphere^[1]. Planets with less dense atmospheres the less effective Ion Thrusters for example are and they operate with higher output. Atmopsheric Thrusters on the other hand increase in effectiveness the more dense the atmosphere is. <A general explanation of how planet atmospheres and its effects work.>

Ion Thrusters

Ion Thrusters (Large Thruster), vary linearly in effectiveness from a minimum of 30% near the surface of a planet with a thick atmosphere to full 100% effectiveness out of it. Planets or Moons entirely without atmospheres will have Ion Thrusters operate at full effectiveness.

e = effectiveness of Ion Thruster as a percentage
r = current altitude/distance from the core of the planet in meters
R = radius of the planet in meters
A = 'LimitAltitude' effectively defining the height of the atmosphere.
H = The 'Hills' Parameter - it's found in the planet's sbc file, 
    it loosely correlates to the maximum height of any mountain/hill as a ratio.
    Typically this is exactly '0.12'.

           (r - R) 
e =   ( ------------ ) x 0.7 + 0.3
         (R x H x A) 

Atmospheric Thrusters

Atmospheric Thrusters act almost inversely with Ion Thrusters, while thick atmospheres are disadvantageous to Ion Thrusters - they are advantageous to Atmospheric Thrusters. They operate anywhere 100% at the planet's radius or 'the surface' to 0% effectiveness (providing no lift or propulsion) when they leave the atmosphere of the planet. They require an atmosphere to operate, whether breathable or not.

e = effectiveness of Atmospheric Thruster as a percentage
r = current altitude/distance from the core of the planet in meters
R = radius of the planet in meters
A = 'LimitAltitude' effectively defining the height of the atmosphere, typically 2.0
H = The 'Hills' Parameter - it's found in the planet's sbc file, 
    it loosely correlates to the maximum height of any mountain/hill as a ratio.
    Typically this is exactly '0.12'.

               (r - R) 
e = 1 - ( ----------------- ) 
           R x 0.7 x H x A 

<Explanation on how natural thrusters affect Ion thrusters and how they differ from Atmosphere ones>

Gravitational Field

<A general explanation of how planet gravity and its effects work. Heavily detailed information about natural gravity should go into the link below> ^[2]

g = the current acceleration due to gravity felt at r (the current altitude away from the core) in m/s^2 (on the surface it should be 9.81 m/s^2 or 1 G)
r = current altitude/distance from planet 'center' or core in meters.
R = the predefined Radius of the planet [Typically 60 km] in meters.
H = The 'Hills' Parameter - it's found in the planet's sbc file, 
    it loosely correlates to the maximum height of any mountain/hill as a ratio.
    Typically this is exactly '0.12'.

if r > R x (1+H)       g = 9.81 x(R x (1+H)/r )^7   [Gravity after the "hills" parameter attitude decreases exponentially]
if R <= r <= R x (1+H) g = 9.81                     [Gravity remains 1 G until, your attitude is greater than the Hills Parameter attitude]
if r < R               g = 9.81 x ( 1 - r/R )       [Under the 'surface'/radius of the planet]

Once the gravity of the planet or moon (in units of G), reaches 0.05 G or gravitational acceleration is less than 0.5 m/s^2 anything beyond this range is no longer affected by the planet's gravity and has completely escaped it's gravitational influence. This distance is much shorter than in reality for actual planets, making actual high altitude low-speed orbits impossible - although it is possible to park a station in place at this point to act as if it were in Geosynchronous orbit.

Gravity Generators (Gravity Generator, Spherical Gravity Generator) and Jump drives are negatively affected by the presence of natural gravity from planets and moons, which for Jump Drives renders them completely inoperable - the presence of any Natural Gravity that is sufficiently detectable (greater than 0.05 G) cannot be 'jumped' into or out of. Gravity Generators will still operate in natural gravity but at increasingly reduced effectiveness the stronger the natural gravity becomes.

• Mechanics - Natural Gravity Explained

Hazards

Pirate Bases

Currently only present on:

• Easy Start Earth
• Easy Start Moon
• Easy Start Mars
• Easy Start Alien

Pirate Bases are hostile structures under the Ownership of the Pirate faction. They will periodically spawn hostile ships to attack the player(s) at any given location, and will keep doing so until they or the player is completely destroyed.

The pirate bases are not randomly generated, but instead were placed manually into the world. Each Planet has a set number of these bases, and on it's accompanied Moon for the player(s) to add more challenge/difficulty.

NPCs

Planets are home to NPC's, that will make building or operating on a Planet much more challenging or interesting. Their aggressiveness, spawn timers, and numbers range differ from each other. The engineers location does not matter, they will spawn in any environment on the Planet surface. Listed below are the NPC's in the game:

Planet Variants

<Explanation of planets having different types>

There are three types of planets, as follows. Earth, Mars, and Alien.

Earth-Like

The Earth planet variation represents a scaled down version of the real-life Earth. It has similar plants, and some of the environments. It has a breathable atmosphere, and a default Gravity of 1G.

• Earth

Mars

The Mars planet variation represents a scaled down version of the real-life Mars. It's a barren planet with no vegetation of any kind. It has a default Gravity of 0.9G, but does not have a breathable atmosphere.

• Mars

Alien

The Alien planet variation is a fictional planet with a unique set of properties and strange vegetation. It has a default Gravity of 1.10G, and has a thin breathable atmosphere, but just barely.

• Alien

See Also

• Moon

Known Issues

Update History

References

1. ↑ http://forum.keenswh.com/threads/atmosphere-falloff-and-thruster-types.7373331/
2. ↑ JoeTheDestroyer - http://forum.keenswh.com/threads/does-the-source-on-github-actually-contain-the-planets-release.7373953/