GPU-accelerated physically-based spectral path tracer for Julia, built on KernelAbstractions.jl. Used as the ray tracing backend for Makie.jl via RayMakie.
BOMEX LES cloud field with volumetric path tracing
All renders produced with Hikari via RayMakie. Demo source code at SimonDanisch/RayDemo.
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| Terrain with volumetric clouds | Black hole with gravitational lensing |
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| Protein structure (glass) | Protein structure (gold conductor) |
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| CMS particle detector (Geant4.jl) | HL-20 spacecraft with volumetric exhaust |
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| Oil palm (PlantGeom.jl) | Stanford bunny cloud (NanoVDB) |
- GPU-accelerated: Runs on AMD (ROCm) and NVIDIA (CUDA) GPUs via KernelAbstractions.jl
- Spectral rendering: Hero-wavelength spectral path tracing with CIE XYZ color matching
- Volumetric path tracing: Delta tracking with null scattering for participating media (fog, smoke, clouds)
- NanoVDB support: Sparse volumetric data for large-scale cloud/smoke rendering
- pbrt-v4 based: Physically-based materials and light transport ported from pbrt-v4
- Material system: Glass, conductor (measured spectral data), coated diffuse, thin dielectric, diffuse transmission, and more
- BVH light sampling: Spatially-aware importance sampling for many-light scenes
- Makie integration: Drop-in ray tracing backend for the Makie ecosystem via RayMakie
| Package | Description |
|---|---|
| Raycore.jl | BVH acceleration and ray-scene intersection |
| RayMakie | Makie backend that connects Hikari to the Makie plotting ecosystem |
| RayDemo | Demo scenes and rendered gallery |
] add HikariUsing Hikari through RayMakie:
using GLMakie, RayMakie, Hikari
# Activate the ray tracing backend
backend = Hikari.KernelAbstractions.CPU() # Or e.g. CUDA.CUDABackend() or AMDGPU.ROCBackend()
RayMakie.activate!(; device=backend)
# Build a scene with Makie
scene = Scene(; size=(800, 800), lights=[Makie.SunSkyLight(Vec3f(1, 2, 9); intensity=1f0, turbidity=3f0, ground_enabled=false)])
cam3d!(scene)
# Add geometry with physically-based materials
mesh!(scene, Sphere(Point3f(0), 1f0); material=Hikari.GlassMaterial(index=1.5))
mesh!(scene, Rect3f(Point3f(-2, -2, -1), Vec3f(4, 4, 0.01));
material=Hikari.Gold(roughness=0.01f0))
# Render
integrator = Hikari.VolPath(samples=256, max_depth=12)
img = Makie.colorbuffer(scene; integrator=integrator)Originally developed as Trace.jl by Anton Smirnov. Rewritten with GPU support, spectral rendering, and a pbrt-v4 based volumetric path tracer.