oni-calculator

name	ONI Calculator
description	Oxygen Not Included production chain calculator with SQLite database extracted from decompiled game source

ONI Calculator

Instructions

When helping users with Oxygen Not Included calculations and planning:

1. Database Location: oni-calculator/oni_data.db - SQLite database with building data
2. Decompiled Source: oni-decompiled/Assembly-CSharp/ - C# source for pattern discovery
3. Extraction Tool: oni-calculator/src/extract.rs - Rust code that parses C# into SQLite

Query the Database First

Use sqlite3 to query building data:

sqlite3 oni-calculator/oni_data.db "SELECT * FROM buildings WHERE id LIKE '%Pump%'"
sqlite3 oni-calculator/oni_data.db "SELECT building_id, rate_kg_per_s FROM building_outputs WHERE resource_id='Oxygen'"

If Data is Missing

1. Grep the decompiled source to find the pattern:

   grep -E "consumptionRate|OutputElement" oni-decompiled/Assembly-CSharp/BuildingNameConfig.cs
   

2. Update oni-calculator/src/extract.rs with a new regex pattern

3. Re-run extraction:

   cd oni-calculator && cargo run -- extract ../oni-decompiled/Assembly-CSharp --clear
   

4. Commit the fix so it persists

Key Database Tables

• buildings - id, name, power_watts (negative=consumes, positive=generates), heat_output_dtu
• building_inputs - building_id, resource_id, rate_kg_per_s
• building_outputs - building_id, resource_id, rate_kg_per_s

Common Calculations

• Buildings needed: target_rate / building_output_rate
• Power budget: Sum of power_watts (negative = consumption)
• Heat output: Sum of heat_output_dtu
• Pump duty cycle: required_rate / pump_throughput

Examples

Example 1: SPOM Planning

User: How many electrolyzers do I need for a hydrogen generator?

Claude: [Queries database for Electrolyzer outputs and HydrogenGenerator inputs]
- Electrolyzer produces 0.112 kg/s Hydrogen
- H2 Generator consumes 0.1 kg/s Hydrogen
- Answer: 0.89 Electrolyzers (practically: 1 Electrolyzer with 12% surplus)

Example 2: CO2 Handling

User: How many CO2 scrubbers for my coal generators?

Claude: [Queries database]
- Coal Generator outputs 0.02 kg/s CO2
- CO2 Scrubber consumes 0.3 kg/s CO2
- Answer: 1 scrubber handles 15 generators

Example 3: Missing Data

User: What's the throughput of a gas pump?

Claude: [Queries DB, finds data missing]
[Greps source: grep consumptionRate oni-decompiled/Assembly-CSharp/GasPumpConfig.cs]
[Finds: elementConsumer.consumptionRate = 0.5f]
[Updates extract.rs with ElementConsumer pattern]
[Re-runs extraction, commits fix]
Answer: 0.5 kg/s

Example 4: Heat Comparison

User: Which generator runs coolest?

Claude: [Queries: SELECT id, power_watts, heat_output_dtu FROM buildings WHERE power_watts > 0]
[Calculates DTU per watt for each]
Answer: Hydrogen Generator at 5 DTU/W, Coal is 15 DTU/W

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Reference

Useful Queries

-- All buildings that produce a resource
SELECT building_id, rate_kg_per_s FROM building_outputs WHERE resource_id = 'Oxygen';

-- All inputs for a building
SELECT resource_id, rate_kg_per_s FROM building_inputs WHERE building_id = 'Electrolyzer';

-- Power generators ranked by efficiency
SELECT id, power_watts, heat_output_dtu,
       heat_output_dtu / power_watts as dtu_per_watt
FROM buildings
WHERE power_watts > 0
ORDER BY dtu_per_watt;

-- Buildings that consume a resource
SELECT building_id, rate_kg_per_s FROM building_inputs WHERE resource_id = 'Water';

Extraction Patterns in extract.rs

Currently captured patterns:

• const string ID = "BuildingName" - Building IDs
• EnergyConsumptionWhenActive = 120f - Power consumption
• GeneratorWattageRating = 800f - Power generation
• ConsumedElement(new Tag("X"), rate) - ElementConverter inputs
• ConsumedElement(GameTagExtensions.Create(SimHashes.X), rate) - Alternative input format
• OutputElement(rate, SimHashes.X, ...) - ElementConverter outputs
• CreateSimpleFormula(input, rate, capacity, output, rate) - Generator fuel/exhaust
• elementConsumer.consumptionRate - Pump throughput
• conduitConsumer.consumptionRate - Pipe consumer rates

Patterns NOT yet captured (add when needed):

• Recipe-based buildings (Metal Refinery, Rock Crusher)
• Critter outputs (Hatch coal production, etc.)
• Plant growth rates
• Duplicant consumption rates

CLI Commands

cd oni-calculator

# List all buildings
cargo run -- list-buildings

# Show building details
cargo run -- building Electrolyzer

# List producible resources
cargo run -- list-resources

# Calculate production chain (picks first producer alphabetically)
cargo run -- calc Oxygen --rate 1.0 --verbose

# Re-run extraction
cargo run -- extract ../oni-decompiled/Assembly-CSharp --clear

Key ONI Numbers

Building	Power	Throughput	Heat
Electrolyzer	-120W	1 kg/s Water → 0.888 O2 + 0.112 H2	1250 DTU/s
H2 Generator	+800W	0.1 kg/s H2	4000 DTU/s
Coal Generator	+600W	1 kg/s Coal → 0.02 CO2	9000 DTU/s
Gas Pump	-240W	0.5 kg/s	0 DTU/s
Liquid Pump	-240W	10 kg/s	2000 DTU/s
CO2 Scrubber	-120W	0.3 kg/s CO2 + 1 kg/s Water	1000 DTU/s