huazyyang / fluctus

An interactive OpenCL wavefront path tracer

Fluctus

OpenCL wavefront path tracer

Features

• Physically based renderer
  • PBRT and OBJ scenefiles
  • Lambertian, glossy, ideal specular, and microfacet (GGX) BSDFs
  • Multiple importance sampled environment maps (alias method)
• Wavefront path tracing at interactive framerates
  • Two implementations, one tuned for latency and the other for throughput
  • Optimized structure of arrays data layout
  • Efficient BVH with spatial splits
• OptiX AI denoiser (on supported NVIDIA hardware)
  • Requires OptiX 7, CUDA 10.1+, driver 435.80+
• Supports a wide variety of systems
  • Cross-platform (Windows, MacOS, Linux)
  • NVIDIA, AMD and Intel GPUs and CPUs
  • CPU debugging with Intel's OpenCL SDK
• Nanogui-based user interface
  • Uses only modern OpenGL (3.3+)
• Uses CLT for convenience and robustness

Usage

Rename settings_default.json to settings.json. Modify to set default OpenCL device, render scale, window dimensions etc.

Controls

Key	Action
W / A / S / D	Move camera (up/down with R/F)
Mouse left	Look around
Mouse right	Pick DoF focal depth (after setting aperture size)
Scroll Up / Down	Adjust movement speed
Space	Place area light
F1	Reset camera
F2	Save camera/area light state
F3	Load saved state
F5	Export image
F6	Toggle OptiX Denoiser (if built)
H	Toggle light sources (environment/area/both)
I / K	Adjust max bounces
Z / X	Adjust environment map emission
L	Open scene selector
M	Switch sampling mode
U	Toggle UI
Page Up / Down	Adjust area light emission
1-5	Select scene 1-5 (if set in settings.json)
7	Switch metween microkernel/wavefront
8 / 9	Change area light size
, / .	Change FOV

Build

See the build instructions.

Gallery

License

Source code and resources provided under the MIT LICENSE, unless otherwise specified.