Full-HD renders from the Metal PathTracer project, converted from EXR to JPG for preview.

These new sequences confirm firefly-free convergence and stable multi-bounce reflection following the implementation of sample energy clamping in the core integrator.

Each set explores conductor BRDF behavior under HDR environment lighting, using measured η/k parameters and GGX microfacet sampling with full Fresnel evaluation and energy conservation:

• Hygieia study — Steel / Glass / Gold: dielectric vs conductor evaluation under uniform lighting.

• Hygieia variant — Steel / Silver / Copper: spectral tinting and grazing-incidence reflectance validation.

• Ajax bust I — Iron / Copper / Gold: high-frequency geometry test for BRDF normalization and highlight stability.

• Ajax bust II — Iron / Silver / Copper: roughness compensation and spectral reflectance consistency across alloys.

All renders were computed on Apple Silicon with MIS and environment importance sampling enabled.