Docs / Appendix B

Info CHOP channels

Add an Info CHOP to any Harlow operator (right-click → Add Info CHOP). Timings are measured on the GPU a frame late.

Operator	Channels
HRLW Path Tracer	`samples`, `converged`, `points`, `triangles`, `spheres`, `curve_segments`, `textures`, `emissive_triangles`, `scene_pops`, `weather_maps`; timings `frame_ms` (GPU time per frame), `cook_ms` (CPU time of the cook), `gather_ms` (always 0 now; kept so older networks don't lose a channel), `render_ms`, `scene_ms`, `trace_ms`, `post_ms`, `prep_ms`; `rays_per_pixel`, `shadow_rays_per_pixel`, `anyhit`; state `dlss_rr`, `pipeline` (2 specialised, 1 compiling, 0 generic), `pipeline_variants`, `features`, `max_registers`, `cluster_bvh`, `path_reuse`, `guiding`, `exposure_ev`, `render_scale`, `focus_distance`, `gpu_free_mb`
HRLW Liquid	`particles`, `mesh_points`, `mesh_triangles`, `substeps`, `max_speed`, `gpu_mb`, the box, `pressure_iters`, `collider_tris`, `collider_open_tris`, `sim_ms` (+ `sim__ms` phases), `output_ms` (+ `mesh__ms`), `colliders_ms`
HRLW Whitewater	`whitewater` (count)
HRLW Volume Solver	`pressure_iters`, `sim_ms` (+ `sim__ms`), `colliders_ms`, `active_tiles`, `gpu_mb`, `box_min_`, `box_max_`, `collider_tris`, `collider_open_tris`, `burning_surfaces`, `interact_liquids`; with Profile Pressure: `pressure__ms`
HRLW Bodies	`bodies`, `joints`, `broken_joints`, `contacts`, `pairs`, `colors`, `max_speed`, `dropped_pairs`, `mesh_points`, `mesh_triangles`, `collider_tris`, `gpu_mb`, `colliders_ms`, `sim_ms`, `output_ms`, `soft_bodies`, `soft_nodes`, `emitted_alive`, `emitter_spares`; debug: `serial_bodies`, `color_rounds`, `static_asleep`, `loose_pieces`, `glued_joints`, `max_penetration`, `max_joint_error`, `max_contact_g`
HRLW Fracture	`pieces`, `meshes`, `open_cuts`, `cut_ms`
HRLW Surface	`bounds_center_`, `bounds_size_`, `seam_edges`, `open_edges`, `coverage`, `texel_size_lo`, `texel_size_hi`, `layout_ms`