gravity (incomplete)

Active from 17 April 2018 to 6 Aug 2020

• Latest version: v0.6.4

Description

A simulation for gravity bodies and systems

Features

Physics

• Collision (mass merging) of bodies
• Controllable craft (experimental)
• Predictive orbital path trails

Graphics

• Orbital trails for prominent bodies (over a mass threshold)
• Dynamic shadows for bodies
• Stellar bloom
• Comet trails (dust and gas)
• Screen culling (for performance)

Simulation manipulation

• Manual spawning of objects
• Slingshot object spawning
• Command line for changing sim options
• User spawning (with auto-orbit)

Controls

Camera

• Camera movement [arrow keys]
• Camera zoom [+/-]
• Zoom multiplier [9: decrease / 0: increase]
• Reset position [l]

Time

• Time step [</>]
• Toggle Pause/Play [/]
• Reset time step to x1 [m]

Targetting

• Select target [r: previous / y: next]
• Toggle targeting [t]
• Toggle target mode [e]
• Toggle target largest [u]

Prediction

• Predict using other bodies [5]

Object manipulation (only when targeting)

• Change direction [arrow keys]
• Increase velocity [']
• Decrease velocity [;]

Spawning

• Spawn at position [mouse down]
• Cancel [esc]
• Toggle spawn roid on click [i]
• Toggle orbit target [o] (spawnmode 0 only)

Commands

• system

  • load [system]
  • generate [system radius] [entity count] ?[g value] ?[mass threshold]
  • save
  • compile [system representation]
  • entity
    • set
      • mass [value]
      • dx [value]
      • dy [value]
    • delete (on selected target)
  • set
    • g [value]
    • entitycap [value]
    • spawnrange [value]
    • cullrange [value]
    • typescale [value]
    • collisionmode [0: none / 1: absorb / 2: distributive]

• roid

  • set
    • mass [value]
    • type/disguise [type]
  • toggle
    • override

• set

  • viewscale [value]
  • viewscale.step [value]
  • offsetstep [value]
  • offsetstep.step [value]
  • trailwidth [value]
  • trailsamples [value]
  • trailmode [0: relative to world / 1: relative to target]
  • trailcalcmode [0: distance / 1: angle / 2: distance amd angle]
  • spawnmode [0/1]
  • radiusconst [value]

• goto

  • entity [id]
  • position (not implemented)

• toggle

  • ui
  • targetcursor
  • radiuscoloring
  • clear
  • trails
  • trailnodes
  • predictpath
  • nightmode
  • trivial (true: show trivial entities)
  • renderculling
  • pause
  • shading
  • fadeatmosphere
  • usebackground

• info

  • mode [0/1/2/3]
  • hide (hides UI)

• display

  • fontsize [text type] [size]
  • mode
    • natural
    • minimal

• timestep

  • set [value]
  • overridemax [value]

Changes

• See the changelog

Future plans

• Overhaul with OOP and TypeScript
• Rework UI for better user experience
• Add user manual for controls and commands
• JSON system representation