# Games Have Never Simulated Clothing Like This Before

Source: https://www.youtube.com/watch?v=vYZbwJJk_hc
Recap page: https://rapidrecap.app/video/vYZbwJJk_hc
Generated: 2025-11-16T17:05:12.24+00:00

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## Quick Overview

Advanced cloth simulation techniques, demonstrated through examples from video games (like Baldur's Gate 3) and academic research, achieve highly realistic and complex knot formations, such as bows and ties, in real-time or near real-time, significantly outperforming traditional methods struggling with collision detection and high vertex counts.

**Key Points:**
- The video showcases state-of-the-art cloth simulation techniques capable of rendering complex knots, like bows and ties, with high fidelity, contrasting them with previous limitations.
- Examples from video games like Baldur's Gate 3 demonstrate in-game cosmetic clothing options that are visually impressive, such as the 'City of Brass Outfit' and 'Circus Ensemble'.
- Academic research demonstrates solving difficult knot simulation problems (like those involving rope or complex fabric folds) using methods that avoid prohibitive computational costs associated with high-resolution geometry.
- One key research finding is that simulating every thread (as shown with yarn samples) is computationally prohibitive, leading to the use of techniques that manage resolution and collision detection effectively.
- A method involving 'template parameters' successfully simulates complex fabric ties, such as a bow on a trench coat, resulting in natural shapes that run in real-time, unlike prior techniques that produced poor geometry.
- The research highlights the success of procedural yarn geometry combined with edited optical parameters for realistic material representation and the use of BVH for broad-phase culling in collision resolution.

![Screenshot at 00:00: A side-by-side comparison of two outfits in Baldur's Gate 3, the 'City of Brass Outfit' and 'Slashstrip Sandals', illustrating the high visual fidelity of in-game character clothing available.](https://ss.rapidrecap.app/screens/vYZbwJJk_hc/00-00-00.png)

**Context:** The video explores the cutting edge of cloth simulation technology, contrasting visual results from modern video games, like character outfits shown in Baldur's Gate 3, with advanced techniques presented in computer graphics research papers. The central theme is overcoming the historical difficulty of accurately and efficiently simulating complex fabric interactions, specifically knots, ties, and fine folds, which often caused artifacts or required massive computational resources.

## Detailed Analysis

The video demonstrates significant advancements in cloth simulation, moving beyond simple draping to accurately render complex, tightly constrained structures like knots and bows. Initially, it features cosmetic outfits from Baldur's Gate 3, such as the detailed 'City of Brass Outfit' and the vibrant 'Circus Ensemble', showing what is achievable in modern game development. The narrative then shifts to academic research, highlighting the difficulty of simulating knots where traditional methods fail due to self-intersection and high computational cost, as lamented by one designer who spent hours getting a decent result. Researchers present methods that successfully create realistic simulations, such as a bow knot on a trench coat (11K vertices for a simple bow, 54K for a double knot) and a Windsor knot on a dress shirt (10K vertices), performing these simulations in real-time using techniques that manage complexity, such as bounding volume hierarchy (BVH) for broad-phase culling and collision resolution via contour minimization. Furthermore, the video contrasts low-resolution mesh tessellation, which causes 'pass-through artifacts' on scarves, with high-resolution results that resolve these issues, although high resolution itself remains computationally demanding. The final segment contrasts the difficulty of simulating every thread of yarn (which is too costly) with the success of procedural geometry and edited optical parameters to capture realistic material appearance.

### Video Game Clothing Fidelity

- City of Brass Outfit equipped by Shadowheart
- Circus Ensemble equipped by Astarion
- Jaheira's Respectable Clothes equipped by Shadowheart
- Minsc's Fantastical Relaxation Garb

### Challenges in Knot Simulation

- Traditional methods struggle with self-intersection and require prohibitive computational costs
- A designer lamented spending hours on a knot that kept falling apart
- High-resolution cloth models risk 'pass-through artifacts' due to insufficient triangulation

### Advanced Simulation Techniques

- Utilizing BVH for broad-phase culling and contour minimization gradient for collision resolution
- Successfully simulating complex knots like the bow knot (11K vertices) and Windsor knot (10K vertices) in real-time

### Procedural Geometry for Realism

- Demonstrations show template-based knotting that runs fast by predicting collisions before they occur
- Final results show realistic draping on a trench coat and a tied blouse, proving the technique's efficacy across various styles

![Screenshot at 00:00: Showcase of detailed cosmetic outfits from Baldur's Gate 3, including the 'City of Brass Outfit'.](https://ss.rapidrecap.app/screens/vYZbwJJk_hc/00-00-00.png)
![Screenshot at 00:04: Display of the brightly colored 'Circus Ensemble' outfit, designed for fun rather than function.](https://ss.rapidrecap.app/screens/vYZbwJJk_hc/00-00-04.png)
![Screenshot at 00:08: Jaheira's 'Respectable Clothes' shown in green and brown, demonstrating another in-game cosmetic option.](https://ss.rapidrecap.app/screens/vYZbwJJk_hc/00-00-08.png)
![Screenshot at 00:16: The 'Full Body Cast' item in Roblox, used as an example of clothing that does not simulate correctly on characters.](https://ss.rapidrecap.app/screens/vYZbwJJk_hc/00-00-16.png)
![Screenshot at 00:33: Academic comparison showing the difference between a poorly simulated knot \(left\) and a successful simulation \(right\) using template parameters.](https://ss.rapidrecap.app/screens/vYZbwJJk_hc/00-00-33.png)
![Screenshot at 00:47: 3D modeling software showing the intersection of two geometric shapes, representing the core problem of simulating overlapping cloth.](https://ss.rapidrecap.app/screens/vYZbwJJk_hc/00-00-47.png)
![Screenshot at 01:12: Interface demonstrating the process of selecting knot regions on a 3D model before simulation.](https://ss.rapidrecap.app/screens/vYZbwJJk_hc/00-01-12.png)
![Screenshot at 01:51: A beautifully simulated trench coat with a perfectly tied bow, showcasing the successful outcome of the advanced physics-based method.](https://ss.rapidrecap.app/screens/vYZbwJJk_hc/00-01-51.png)
![Screenshot at 02:54: A comparison graphic showing that simulating every thread \(like yarn\) results in massive detail but is computationally too expensive.](https://ss.rapidrecap.app/screens/vYZbwJJk_hc/00-02-54.png)
![Screenshot at 04:47: Demonstration of collision detection using bounding boxes around geometric primitives \(cube, egg, bunny\) to test intersection capability.](https://ss.rapidrecap.app/screens/vYZbwJJk_hc/00-04-47.png)