fix(render): LINE/POINT endpoints are WCS, not OCS

DXF/DWG store LINE endpoints and POINT locations in world coordinates -
the extrusion normal only orients the thickness sweep / glyph. Running
them through the arbitrary-axis OCS mirrored every line and point
carried over from a MIRROR (normal 0,0,-1) onto the wrong side of the
drawing: bolt shafts of a mirrored detail block landed in the adjacent
panel while its nut arcs (correctly OCS-mapped) stayed put.

Co-Authored-By: Claude Fable 5 <[email protected]>

src/entities/line.rs

@@ -11,13 +11,14 @@ use crate::scene::model::object::{GripApply, GripDef, PropSection};
 use crate::scene::model::wire_model::TangentGeom;
 
 fn to_truck(line: &Line) -> TruckEntity {
+    // LINE endpoints are stored in WCS — unlike the planar OCS entities
+    // (ARC/CIRCLE/LWPOLYLINE/TEXT), the extrusion normal on a LINE only
+    // orients its thickness sweep. Remapping the endpoints through the
+    // arbitrary-axis OCS mirrored every line carried over from a MIRROR
+    // (normal 0,0,-1) to the wrong side of the drawing.
     let normal = (line.normal.x, line.normal.y, line.normal.z);
-    let (sx, sy, sz) = crate::scene::view::transform::ocs_point_to_wcs(
-        (line.start.x, line.start.y, line.start.z),
-        normal,
-    );
-    let (ex, ey, ez) =
-        crate::scene::view::transform::ocs_point_to_wcs((line.end.x, line.end.y, line.end.z), normal);
+    let (sx, sy, sz) = (line.start.x, line.start.y, line.start.z);
+    let (ex, ey, ez) = (line.end.x, line.end.y, line.end.z);
     let p0 = Point3::new(sx, sy, sz);
     let p1 = Point3::new(ex, ey, ez);
     let kv: Vec<[f64; 3]> = vec![[p0.x, p0.y, p0.z], [p1.x, p1.y, p1.z]];

src/entities/point.rs

@@ -30,11 +30,10 @@ fn pdsize_world(pdsize: f64) -> f64 {
 /// units. Shared by the header-driven path ([`to_truck`]) and the
 /// viewport-aware relative path ([`relative_truck`]).
 fn point_truck(pt: &Point, pdmode: i16, s: f64) -> TruckEntity {
-    let normal = (pt.normal.x, pt.normal.y, pt.normal.z);
-    let (wx, wy, wz) = crate::scene::view::transform::ocs_point_to_wcs(
-        (pt.location.x, pt.location.y, pt.location.z),
-        normal,
-    );
+    // POINT location is stored in WCS (the extrusion normal only orients the
+    // glyph/thickness) — remapping it through the arbitrary-axis OCS moved
+    // mirrored points (normal 0,0,-1) to the wrong side of the drawing.
+    let (wx, wy, wz) = (pt.location.x, pt.location.y, pt.location.z);
     let snap = glam::DVec3::new(wx, wy, wz);
     if pdmode == 0 {
         // Default: a single vertex (driver handles the dot pixel).