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== Development & Revision Notes ==
----
 
== Future Changes (260222) ==
 
; Source : [[Mneme_World_Generator_260222]]
; Status : '''Active — to be incorporated into the next version'''
; Version : Draft 2.1
; Philosophy : Simulationist, Recursive, Modular
 
=== Proposed New Chapter Structure ===
 
The next version reorganises the rulebook into these top-level chapters:
 
# Introduction — Credits, Key Definitions, Core Philosophy, Required Tools
# Level 1: Stellar Generation — System Budget, Primary Star, Multiple Stars, Barycenters, Rule of Five
# Level 2: Inras (IntraStellar) Systems — Generation Pool, Gravitational Waterfall, Mutual Hill Radius, Orbital Zones
# The Prime Inras (Main World) — Main World Type, Habitability Waterfall Algorithm
# Civilisation & World Development — HDI, Gini Coefficient, SOC, Effective Standard of Living
# Technology & Hard Sci-Fi Mechanics — Mneme Tech Level System, Tech Distribution, Delta-V Map
# Economics & Infrastructure — Credit Recalibration, Starport Generation, Port Value Score
# Environments & Equipment — Environmental Systems, Artificial Habitats, Procedural Vacc Suits
# Appendices — Traveller/CE Integration, PWA, D66×D6 Tables, Glossary, OGL
 
=== New Four-Level Orbital Hierarchy ===


{| class="wikitable" style="width:100%"
{| class="wikitable" style="width:100%"
! Document !! Date !! Description
! Level !! Name !! Components
|-
| 1 || Stellar & Barycenters || Stars, Companion Stars, Barycenters (centres of mass)
|-
| 2 || Inras (IntraStellar) Systems || Gas Giants, Terrestrials, Dwarf Planets, Asteroid Belts, Circumstellar Disks
|-
| 3 || Sub-Systems || Moons, Ring Systems, Co-orbitals (Trojans/Greeks), Lagrange Point Clusters
|-
|-
| [[Mneme World Generator/Revision Notes 260222|Revision Notes & Upcoming Changes (260222)]] || 22 Feb 2026 || '''Active''' — All new mechanics and structural changes from the 260222 session to be incorporated into the next version. Includes Mutual Hill Radius, Gravitational Queue Placement, Habitability Waterfall, updated SOC/HDI/Gini systems, and proposed new chapter structure.
| 4 || Details & Surface || Continents, Biomes, Craters, O'Neill Cylinders, Surface Centrifuges ("Magicians")
|}
|}
: ''"A moon orbiting a planet uses the same physics engine class as a planet orbiting a star."''
=== New Orbital Zone Formulae (Replaces Zone Table) ===
'''Snow Line:'''
<pre>D_snow = 2.7 × √L_Star</pre>
'''Habitable Zone:'''
<pre>HZ_center = √L_Star
HZ_inner  = 0.95 × HZ_center
HZ_outer  = 1.37 × HZ_center</pre>
{| class="wikitable" style="width:100%"
! Zone !! Range !! Description
|-
| Infernal Zone || 0.0 – 0.1 AU || Hot Jupiter territory
|-
| Inner Zone || 0.1 AU – HZ_inner || Too hot for liquid water
|-
| Habitable Zone || HZ_inner – HZ_outer || Goldilocks zone
|-
| Outer Zone || HZ_outer – D_snow || Asteroid Belt usually forms here
|-
| Frozen Zone || D_snow – 100 AU || Gas/Ice Giant territory
|-
| Scatter Disk || > 100 AU || Kuiper Belt, Oort Cloud
|}
=== Mutual Hill Radius — New Core Formula ===
Defines the gravitational reach of two planets and determines minimum safe orbital spacing:
<pre>R_H = ((a₁ + a₂) / 2) × ∛((m₁ + m₂) / (3 × M_Star))</pre>
{| class="wikitable"
! Variable !! Definition
|-
| a || Semi-Major Axis in AU
|-
| m || Planet Mass in Earth Masses
|-
| M_Star || Star Mass (massive stars compress Hill Radii)
|}
'''Mneme Stability Standard (K Values):'''
{| class="wikitable"
! K Value !! Meaning
|-
| K < 3.5 || Chaos Limit — Unstable
|-
| K < 5 || Mneme Forbidden Zone (Rule of Five)
|-
| K ≈ 8 || Relaxed System (Sol-like baseline)
|}
=== Gravitational Queue Placement (Replaces Position Table) ===
# Sort all objects by Mass (highest to lowest)
# Place heaviest object first (Gas Giant at Snow Line)
# Calculate its Forbidden Zone using the Mutual Hill Radius
# Each next object must sit at <code>Δa > 5 × R_H</code> from existing objects
# If conflict: '''The Shove''' — push outer planet to safe distance: <code>a_outer_new = a_new + (5 × R_H) + Variance</code>
# '''Ripple Effect''' — repeat down the chain until no conflicts remain
* '''Far Outer Exception:''' Objects in the Scatter Disk (>100 AU) are never moved; the intruder is ejected instead
=== Habitability Waterfall Algorithm (Replaces Habitability Table) ===
{| class="wikitable" style="width:100%"
! Step !! Factor !! Logic
|-
| 1 || Mass & Gravity || Low mass → Disadvantage on Atmosphere. High mass → Advantage
|-
| 2 || Orbital Position || Inner Zone → Adv on Temperature, Disadv on Biochem. Outer Zone → reverse
|-
| 3 || Composition || No volatiles → caps Atmosphere. Abundant volatiles → Dense atmosphere modifiers
|-
| 4 || Hazards || High hazards can immediately disqualify world from "Garden" class
|-
| 5 || Atmosphere || Derived from Mass + Volatiles. Acts as Greenhouse Effect multiplier on Temperature
|-
| 6 || Temperature || Final state from Position (Step 2) × Atmosphere (Step 5) → Habitability Rating
|}
=== Updated Civilisation Mechanics ===
'''New rolls and formulae:'''
* '''HDI Roll''' — 2D6 → determines Human Development Index (Underdeveloped to Very Developed) and World Average SOC
* '''Gini Coefficient Roll''' — determines Inequality Rating (Low to Extreme)
* '''Elite Ratio:''' <code>Elite Ratio = (1 / (Gini Score + 1)) × 10%</code>
* '''Effective SOC:''' <code>Effective SOC = Individual SOC + (World Average SOC - 7)</code>
'''Tech Divide Access Logic:'''
{| class="wikitable"
! SOC Level !! Access
|-
| High SOC (Elites) || Full access to Setting TL
|-
| Mid SOC (Citizens) || Access to Standard TL
|-
| Low SOC (Subsistence) || Restricted to Scavenged / Archaic Tech
|}
=== Updated Starport Generation ===
PVS (Port Value Score) replaces the table roll:
<pre>PVS = (Habitability / 4) + (TL - 7) + Wealth Modifiers</pre>
=== Social Standing — Doubling Power Scale ===
SOC retooled to a Base-2 logarithmic scale — every +1 SOC = 2× increase in Income, Wealth, and Resource Access.
{| class="wikitable"
! SOC !! Meaning
|-
| 10–11 || "Billionaire" / Head of State
|-
| 14+ || Stellar Elite (owns Habitats / Megacorps)
|}
=== Companion Star Cap Multiplier (New) ===
Ensures companion is never more massive/luminous than the primary:
# Convert Primary's Class/Grade to a 0–100 linear value
# <code>Cap Multiplier = Primary Value / Max Possible Value</code>
# Roll for Companion normally, multiply result by Cap Multiplier
=== Planned Supplemental Materials ===
* '''Procedural Vacc Suit Blender File''' — Justin and Nicco to create procedural geometry nodes file for randomised Vacc Suit designs by Tech Level
* '''PWA goals''' — Offline-capable, IndexedDB storage, CSV/JSON export, nested sortable stellar data UI (see [[Mneme World Generator/PWA (Dec 2025)]] and [[Mneme World Generator/PWA Challenges]])


[[Category:Mneme World Generator]]
[[Category:Mneme World Generator]]
[[Category:Gaming Projects]]
[[Category:Gaming Projects]]

Latest revision as of 14:29, 23 February 2026

Mneme World Generator

The Mneme World Generator is a set of variant rules for the Cepheus Engine tabletop RPG system, designed to generate detailed solar systems, worlds, inhabitants, and societies for science fiction settings. It is derived from the Traveller System Reference Document and other Open Gaming Content.

Authors: Justin Cesar Aquino, Niccolo Salonga
Proofreading: Niccolo Salonga
Art: Niccolo Salonga
World Generation Spreadsheet: John Karol Abayan, Lloyd Reyes, Ranz Sapinit, Michael Ibanez, Christine Melody Taa

Supporting Material

Cepheus Engine and Samardan Press are trademarks of Jason "Flynn" Kemp.

This product is derived from the Traveller System Reference Document and other Open Gaming Content made available by the Open Gaming License. These are Variant Rules, specifically called the Mneme Variant Rules. Please credit the Mneme Variant Rules when deriving content from this work.

Core Rulebook

# Chapter Description
0 Front Matter & Credits Credits, acknowledgements, legal notices, and supporting links
1 Chapter 1: Definitions Earth-centric and Mneme definitions, stellar classifications, world types, size classes, atmospheres, and all key terms
2 Chapter 2: Minor Mechanics Advantage/Disadvantage rules and other minor mechanical variants
3 Chapter 3: Mneme World Generator Overview Introduction to the world generation system
4 Chapter 4: Determine Star Stellar class, mass, luminosity, companion stars, zones, limits, and tech level tables
5 Chapter 5: Determine Main World World type, habitat worlds, dwarf planets, terrestrial worlds, gravity determination
6 Chapter 6: Determine Habitability Atmospheric pressure, temperature, hazards, biochemical resources, habitability modifiers
7 Chapter 7: Determine Position (Main World) Terrestrial world qualities, main world position tables
8 Chapter 8: Determine Inhabitants Population, wealth, power structures, development, governance, sources of power, travel zones, starports
9 Chapter 9: Determine Planetary System Full planetary system generation, planetary positions, disk zones, asteroid types, gas world types
10 Appendix Administrative rolls, legal rolls, influencing attitudes, credit values, radiation exposure, vacc suits, hazmat suits, technology level definitions (TL0–TL16), culture table, hex map instructions
11 Open Game License (OGL) Full Open Game License text and Section 15 copyright notices

Supplemental Documents

Document Date Description
Ships & Star Systems – Master Equation Sheet Oct 2025 Master reference sheet covering ship and star system equations and calculations
World Generator PWA v04 Oct 2025 Progressive Web App design document for the Mneme World Generator, version 04
World Generator PWA (Dec 2025) Dec 2025 Updated PWA specification and notes, December 2025
PWA Challenges & Notes Jan 2026 Known challenges and design notes for the World Generator PWA
Logic Specification (Feb 02 2026) Feb 2026 Detailed logic specification for Mneme World Generator implementation
Logic Specification (Feb 22 2026) Feb 2026 Latest revision of the Mneme logic specification

Future Changes (260222)

Source
Mneme_World_Generator_260222
Status
Active — to be incorporated into the next version
Version
Draft 2.1
Philosophy
Simulationist, Recursive, Modular

Proposed New Chapter Structure

The next version reorganises the rulebook into these top-level chapters:

  1. Introduction — Credits, Key Definitions, Core Philosophy, Required Tools
  2. Level 1: Stellar Generation — System Budget, Primary Star, Multiple Stars, Barycenters, Rule of Five
  3. Level 2: Inras (IntraStellar) Systems — Generation Pool, Gravitational Waterfall, Mutual Hill Radius, Orbital Zones
  4. The Prime Inras (Main World) — Main World Type, Habitability Waterfall Algorithm
  5. Civilisation & World Development — HDI, Gini Coefficient, SOC, Effective Standard of Living
  6. Technology & Hard Sci-Fi Mechanics — Mneme Tech Level System, Tech Distribution, Delta-V Map
  7. Economics & Infrastructure — Credit Recalibration, Starport Generation, Port Value Score
  8. Environments & Equipment — Environmental Systems, Artificial Habitats, Procedural Vacc Suits
  9. Appendices — Traveller/CE Integration, PWA, D66×D6 Tables, Glossary, OGL

New Four-Level Orbital Hierarchy

Level Name Components
1 Stellar & Barycenters Stars, Companion Stars, Barycenters (centres of mass)
2 Inras (IntraStellar) Systems Gas Giants, Terrestrials, Dwarf Planets, Asteroid Belts, Circumstellar Disks
3 Sub-Systems Moons, Ring Systems, Co-orbitals (Trojans/Greeks), Lagrange Point Clusters
4 Details & Surface Continents, Biomes, Craters, O'Neill Cylinders, Surface Centrifuges ("Magicians")
"A moon orbiting a planet uses the same physics engine class as a planet orbiting a star."

New Orbital Zone Formulae (Replaces Zone Table)

Snow Line: 

D_snow = 2.7 × √L_Star

Habitable Zone: 

HZ_center = √L_Star
HZ_inner  = 0.95 × HZ_center
HZ_outer  = 1.37 × HZ_center
Zone Range Description
Infernal Zone 0.0 – 0.1 AU Hot Jupiter territory
Inner Zone 0.1 AU – HZ_inner Too hot for liquid water
Habitable Zone HZ_inner – HZ_outer Goldilocks zone
Outer Zone HZ_outer – D_snow Asteroid Belt usually forms here
Frozen Zone D_snow – 100 AU Gas/Ice Giant territory
Scatter Disk > 100 AU Kuiper Belt, Oort Cloud

Mutual Hill Radius — New Core Formula

Defines the gravitational reach of two planets and determines minimum safe orbital spacing: 

R_H = ((a₁ + a₂) / 2) × ∛((m₁ + m₂) / (3 × M_Star))
Variable Definition
a Semi-Major Axis in AU
m Planet Mass in Earth Masses
M_Star Star Mass (massive stars compress Hill Radii)

Mneme Stability Standard (K Values):

K Value Meaning
K < 3.5 Chaos Limit — Unstable
K < 5 Mneme Forbidden Zone (Rule of Five)
K ≈ 8 Relaxed System (Sol-like baseline)

Gravitational Queue Placement (Replaces Position Table)

  1. Sort all objects by Mass (highest to lowest)
  2. Place heaviest object first (Gas Giant at Snow Line)
  3. Calculate its Forbidden Zone using the Mutual Hill Radius
  4. Each next object must sit at Δa > 5 × R_H from existing objects
  5. If conflict: The Shove — push outer planet to safe distance: a_outer_new = a_new + (5 × R_H) + Variance
  6. Ripple Effect — repeat down the chain until no conflicts remain
  • Far Outer Exception: Objects in the Scatter Disk (>100 AU) are never moved; the intruder is ejected instead

Habitability Waterfall Algorithm (Replaces Habitability Table)

Step Factor Logic
1 Mass & Gravity Low mass → Disadvantage on Atmosphere. High mass → Advantage
2 Orbital Position Inner Zone → Adv on Temperature, Disadv on Biochem. Outer Zone → reverse
3 Composition No volatiles → caps Atmosphere. Abundant volatiles → Dense atmosphere modifiers
4 Hazards High hazards can immediately disqualify world from "Garden" class
5 Atmosphere Derived from Mass + Volatiles. Acts as Greenhouse Effect multiplier on Temperature
6 Temperature Final state from Position (Step 2) × Atmosphere (Step 5) → Habitability Rating

Updated Civilisation Mechanics

New rolls and formulae:

  • HDI Roll — 2D6 → determines Human Development Index (Underdeveloped to Very Developed) and World Average SOC
  • Gini Coefficient Roll — determines Inequality Rating (Low to Extreme)
  • Elite Ratio: Elite Ratio = (1 / (Gini Score + 1)) × 10%
  • Effective SOC: Effective SOC = Individual SOC + (World Average SOC - 7)

Tech Divide Access Logic:

SOC Level Access
High SOC (Elites) Full access to Setting TL
Mid SOC (Citizens) Access to Standard TL
Low SOC (Subsistence) Restricted to Scavenged / Archaic Tech

Updated Starport Generation

PVS (Port Value Score) replaces the table roll: 

PVS = (Habitability / 4) + (TL - 7) + Wealth Modifiers

Social Standing — Doubling Power Scale

SOC retooled to a Base-2 logarithmic scale — every +1 SOC = 2× increase in Income, Wealth, and Resource Access.

SOC Meaning
10–11 "Billionaire" / Head of State
14+ Stellar Elite (owns Habitats / Megacorps)

Companion Star Cap Multiplier (New)

Ensures companion is never more massive/luminous than the primary:

  1. Convert Primary's Class/Grade to a 0–100 linear value
  2. Cap Multiplier = Primary Value / Max Possible Value
  3. Roll for Companion normally, multiply result by Cap Multiplier

Planned Supplemental Materials

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