Augmented Mass-Spring model for Real-Time Dense Hair Simulation

TL;DR

This paper introduces a novel augmented mass-spring model that enables real-time, stable, and detailed dense hair simulation at the strand level, balancing efficiency and realism.

Contribution

The paper presents an augmented mass-spring model with a biphasic coupling mechanism, improving stability and realism in real-time dense hair simulation compared to traditional methods.

Findings

Enhanced stability over traditional mass-spring models

Preserves global hair features during simulation

Enables real-time generation and editing of dense hair assets

Abstract

We propose a novel Augmented Mass-Spring (AMS) model for real-time simulation of dense hair at strand level. Our approach considers the traditional edge, bending, and torsional degrees of freedom in mass-spring systems, but incorporates an additional one-way biphasic coupling with a ghost rest-shape configuration. Trough multiple evaluation experiments with varied dynamical settings, we show that AMS improves the stability of the simulation in comparison to mass-spring discretizations, preserves global features, and enables the simulation of non-Hookean effects. Using an heptadiagonal decomposition of the resulting matrix, our approach provides the efficiency advantages of mass-spring systems over more complex constitutive hair models, while enabling a more robust simulation of multiple strand configurations. Finally, our results demonstrate that our framework enables the generation, complex interactivity, and editing of simulation-ready dense hair assets in real-time. More details can be found on our project page: https://agrosamad.github.io/AMS/.