KenM76andClaude Opus 5.5 51b68a8b35 M12: prc-render: overflow-free projection and edges, shared near cuts, decode ceiling ...

- View::project divides by z (or the orthographic half-height) before it
  multiplies, so an on-screen corner no longer turns NaN when x times the
  focal length, or the half-height times the aspect ratio, overflows.
- View::clip cuts each edge from the same end whichever triangle meets it,
  so two triangles sharing an edge across the near plane get one cut point.
- Scene::draw takes each edge with vec3::span, which halves the
  difference when it overflows, so a finite triangle wider than f64::MAX
  keeps its face normal.
- assemble charges each file structure's meshes to the assembly ceilings
  as they are decoded, so decoding stops at the structure that passes one.

Tests, each shown failing with its fix reverted:
a_shared_edge_is_cut_at_the_same_point_from_either_triangle,
an_on_screen_triangle_is_drawn_when_projecting_it_would_overflow,
a_triangle_whose_edges_overflow_is_drawn,
span_keeps_the_direction_of_a_difference_that_overflows,
decoding_stops_at_the_structure_that_passes_the_ceiling.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SqmHYx8FiWM5PcsoiErgp9

2026-11-04 05:12:00 -05:00

..

tests.rs

M12: prc-render: overflow-free projection and edges, shared near cuts, decode ceiling

2026-11-04 05:12:00 -05:00