Atrc

Offline rendering lab based on ray tracing

Note. GPU version is in development...

Features

• [x] Volumetric path tracing with next event estimation
• [x] Volumetric particle tracing
• [x] Volumetric bidirectional path tracing
• [x] Stochastic progressive photon mapping
• [x] Primary sample space MLT on path tracing
• [x] ReSTIR renderer
• [x] Various material models: Disney principled BSDF, phong, DreamWorks fabric ...
• [x] Homogeneous/heterogeneous participating medium
• [x] Normalized diffusion BSSRDF
• [x] Almost all material properties can be specified with 2D/3D textures
• [x] Various geometry models: sphere, quad, triangle, disk, mesh
• [x] Two-level accelerating structure (SAH based BVH)
• [x] Importance sampled environment light
• [x] G-buffer output (albedo, normal, ...)
• [x] Depth of field
• [x] ACES tone mapping
• [x] Image sample space low-pass filter
• [x] (Optional) Integrated OIDN library
• [x] (Optional) Integrated Embree library
• [x] Interactive scene editor

Known Issues

• [ ] Relation between inv gamma correction & linear sampler of image texture

Documentation

doc

Gallery

Editor:

Food (rendered with bdpt) (scene ref here):

Juice (rendered with vol_bdpt) (scene ref here):

Classroom (rendered with vol_bdpt) (scene ref here):

Materials: (rendered with pt):

Fog (rendered with vol_bdpt):

BSSRDF (rendered with pt):

Bedroom (rendered with pt) (scene ref here):

Dining Room (rendered with bdpt) (scene ref here):