Real-Time Rendering of Glints in the Presence of Area Lights

Overview

This repository contains the source code to reproduce the figures from the article

Tom Kneiphof and Reinhard Klein. "Real-Time Rendering of Glints in the Presence of Area Lights." Pacific Graphics 2024.

It contains a Unity3D project and a modified version of Unity3D's High Definition Render Pipeline containing our implementation including parts of previous work. The Beethoven bust from the teaser figure can be found here and should replace Assets/Models/Beethoven.obj.

Project Structure

A copy of the HDRP and core render pipelines are found in the Packages/ directory. Our implementation modifies the HDRP/Lit shader in the HDRP. The relevant entry points for the glint evaluation are found in the functions DirectLighting EvaluateBSDF_Rect(...) and CBSDF EvaluateBSDF(...) in Packages/com.unity.render-pipelines.high-definition@14.0.10/Runtime/Material/Lit/Lit.hlsl. The actual implementation of our method and previous work is split across the files Packages/com.unity.render-pipelines.high-definition@14.0.10/Runtime/Material/Glints/Glints{2023,2024,Subdivision}.hlsl.

The Unity Project itself contains the scenes to reproduce figures and some utility scripts.

Reproducing Figures

By default, the scenes in Assets/Scenes/.../ produce the raw screenshots that we used to assemble our figures. Each scene contains a "TriggerScreenshots" object, responsible for initiating the capturing of screenshots, that will be placed in the Output/ directory.

An exception is the "RepresentativeVideo" scene, for which video caputre is achieved using the UnityRecorder in a Timeline after starting the play mode. Individiaul frames will be placed in Recordings/ where a Makefile can assemble the frames into a video.

Another exception is the "RuntimePlane" scene for which an executable should be built that creates csv files with runtime measurements upon execution.

Scene	Figures in Paper
AreaLightRefAblation	Figs. 7, 8
AreaLightSubdivision	Fig. 9
Beethoven	Fig. 1
Convergence	Fig. 10
MicrofacetRoughness	Fig. 6
RepresentativeVideo	Supp. Video
RuntimePlane	Tab. 1

Citation

If you are using this code in academic research, please cite our paper. The BibTeX entry is (subject to change)

@article{kneiphof2024real,
  title={Real-Time Rendering of Glints in the Presence of Area Lights},
  author={Kneiphof, Tom and Klein, Reinhard},
  journal={arXiv preprint arXiv:2408.13611},
  year={2024}
}