Envlight

A toolkit to load *.hdr environment light map and sample lighting under the split-sum approximation.

This is basically a wrapped version of light.py from nvdiffrec.

Install

Assume torch and nvdiffrast already installed.

pip install envlight

# from github
pip install git+https://github.com/ashawkey/envlight

# or locally
git clone https://github.com/ashawkey/envlight
cd envlight
pip install .

Usage

import envlight

normal # [..., 3], assume normalized, in [-1, 1]
reflective # [..., 3], assume normalized, in [-1, 1]
roughness # [..., 1], in [0, 1]

light = envlight.EnvLight('assets/aerodynamics_workshop_2k.hdr', device='cuda')

diffuse = light(normal) # [..., 3]
specular = light(reflective, roughness) # [..., 3]

# to load another hdr file
light.load('assets/mud_road_puresky_1k.hdr')
light.build_mips()

An example renderer:

# requries extra dependencies: pip install trimesh dearpygui
python renderer.py

https://github.com/ashawkey/envlight/assets/25863658/505d57e6-6e8a-4492-ae02-586e28e038ad

Acknowledgement

• Credits to Nvidia's nvdiffrec.