How UE4 Powers Immersive Real‑Estate Daylight Simulation for Better Home Buying

Background

During the pandemic, on‑site property visits became difficult, prompting the need for an online, immersive experience that replicates aerial panoramas, digital sand tables, and daylight simulations so users can explore homes without leaving home.

Importance of Daylight

Good daylight improves health and comfort for children and the elderly; standards such as GB50180‑2018 mandate minimum residential sunlight exposure.

Factors Influencing Daylight

Key determinants include site location and orientation, building height, spacing, shape, surrounding obstructions, and seasonal variations.

Solution Overview

After collecting these factors, the system calculates solar incident angles based on latitude, then builds a 3D building model in UE4. Developers integrate the model with code to visualize daylight effects, allowing users to gauge floor‑level lighting impacted by the environment.

Design Challenges and Optimizations

Initial models included excessive vegetation and road details, leading to high polygon counts and slow loading. The team reduced unnecessary assets, switched to texture‑based representations, and lowered polygon counts from 14,000 to 2,000, improving performance.

Development Workflow

Assets are managed in a Git repository, enabling seamless collaboration and eliminating manual file transfers; designers upload resources directly to Git, and developers pull updates instantly.

Daylight Simulation Features

The system supports five seasonal configurations (spring equinox, summer solstice, autumn equinox, winter solstice, extreme winter) with full‑day sunrise and sunset times. Users can select any moment or autoplay the current lighting, rotate and zoom the model, and view detailed lighting from any angle.

Color Mapping Based on Sunlight Duration

Using Chinese meteorological sunlight duration data, the UI maps exposure levels to a warm‑tinted color scale, adjusting saturation to highlight differences and convey a “warm” feeling for better visual discrimination.

Product Outcome

The final immersive platform combines panoramic tours, daylight simulation, and duration comparison, enabling users to comprehensively evaluate properties online and make informed purchasing decisions.