forked from 1b-agent/opencadstudio-upstream
Entity converters were casting WCS coordinates to f32 before the renderer subtracted world_offset, which destroyed sub-unit precision on drawings sitting at large coordinates (typical UTM-style CAD files). The multileader case made it visible — glyphs warped under rotation — but every entity that emits TruckObject::Lines/SegmentedLines/key_vertices/fill_tris was affected. Type changes (in src/scene/acad_to_truck.rs): - TruckObject::Lines / SegmentedLines: Vec<[f32; 3]> → Vec<[f64; 3]> - TruckEntity::key_vertices / fill_tris: f32 → f64 All ~17 producer files updated to keep WCS coordinates in f64 right up to the TruckEntity boundary. The consumer in scene/tessellate.rs now performs `(x - ox) as f32` (f64 subtract, then cast) for points, key_vertices, and fill_tris — preserving precision near the camera origin even when the drawing sits at million-unit coordinates. catmull_rom_pts (multileader spline) is now f64; the scene path widens its offset-relative f32 ctrl points to f64 around the call and narrows back at the output. Notes: - Table layout still uses glam::Vec3 (f32) internally; widened to f64 only at the TruckEntity boundary for type compatibility. Separate cleanup to switch its internal math to f64 is tracked. - snap_pts and tangent_geoms remain f32 — they are UI feedback (snap candidates, tangent hints) and the precision is sufficient there.