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kevinpbuckley
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ue-uds-simulation

Configure Ultra Dynamic Sky astronomical simulation for real-world sun, moon, and star positions.

55|5|Updated Mar 26, 2026
Search Tags:#unreal engine#moon phases#time of day#ultra dynamic sky#day night cycle#sun simulation#latitude longitude
One-click install
npx skills add https://github.com/kevinpbuckley/unreal-engine-skills --skill ue-uds-simulation-kevinpbuckley
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: ue-uds-simulation
Source: https://github.com/kevinpbuckley/unreal-engine-skills/tree/main/skills/ultra-dynamic-sky/ue-uds-simulation
Command: npx skills add https://github.com/kevinpbuckley/unreal-engine-skills --skill ue-uds-simulation-kevinpbuckley

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? Setting up geographically accurate sun, moon, and star positions in Unreal Engine requires correct latitude, longitude, time zone, and date configuration in Ultra Dynamic Sky, and misconfigured settings silently produce wrong sky positions. ## Core Features & Use Cases - Real-World Simulation Toggles: Enable Simulate Real Sun, Simulate Real Moon, and Simulate Real Stars to replace manual yaw/pitch settings with astronomical positioning. - Location and Date Setup: Apply city presets or manual latitude/longitude/time zone/North Yaw values, set the simulation date, and control progression with Simulation Speed. - System Clock Sync: Use Use System Time to match in-game time of day to the player's OS clock without enabling full simulation. - Use Case: Set the sky for Tokyo at noon on August 3rd by applying the Tokyo city preset, enabling Simulate Real Sun, and setting Time of Day to 12:00. ## Quick Start Enable Simulate Real Sun in Ultra Dynamic Sky and apply the city preset for my target location so sunrise and sunset match real-world times.

Frequently Asked Questions about ue-uds-simulation

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I set up real-world sun position in Ultra Dynamic Sky?▼

Enable Simulate Real Sun in the Simulation category, then set Latitude, Longitude, and Time Zone for your location, or apply a city preset. Time of Day is interpreted as local time at that location, so the time zone must be correct.

Why is the sun in the wrong position in Ultra Dynamic Sky?▼

The most common cause is a wrong Time Zone setting after changing latitude and longitude, which offsets the sun by hours. Also check North Yaw, which defines what world-space direction counts as north (default is +X).

Can Ultra Dynamic Sky sync in-game time to the system clock?▼

Yes, Use System Time sets Time of Day and date from the OS clock's UTC time offset by your Time Zone. It works independently, so you do not need to enable the other simulation features.

Why are Day Length and Night Length ignored in UDS?▼

When Simulate Real Sun is enabled, Day Length and Night Length are ignored and Simulation Speed controls time progression instead. Dusk Time and Dawn Time are also overridden because the simulation determines horizon-crossing times.

How accurate is the Ultra Dynamic Sky moon simulation?▼

The moon position is calibrated using its 2017 position and stays generally accurate within several decades, appearing in the correct constellation with the correct phase. Dates far in the future, such as 2050 and beyond, may show drift.

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