fix(solids): box and wedge histories framed at the bounding-box centre; no second transform after ACIS lift

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/scene/convert/acis_kernel.rs

@@ -31,23 +31,14 @@ pub fn tessellate_sat(
     if bodies.is_empty() {
         return None;
     }
+    // The kernel's lift already applies each body's transform record; its
+    // scale still sets the tessellation tolerance.
     let mut placed_bodies = Vec::with_capacity(bodies.len());
     for body in bodies {
         let source = body.provenance.source()?;
         let transform = body_transform(document, source.index() as usize).ok()?;
         let placement_scale = transform.map_or(1.0, |(_, _, scale)| scale.abs());
-        let placed = if let Some((matrix, translation, scale)) = transform {
-            let placement = brep::Placement {
-                x_axis: [scale * matrix[0], scale * matrix[1], scale * matrix[2]],
-                y_axis: [scale * matrix[3], scale * matrix[4], scale * matrix[5]],
-                z_axis: [scale * matrix[6], scale * matrix[7], scale * matrix[8]],
-                origin: translation,
-            };
-            brep::transform(&body, &placement)?
-        } else {
-            body
-        };
-        placed_bodies.push((placed, placement_scale));
+        placed_bodies.push((body, placement_scale));
     }
     let bodies = placed_bodies;
     let resolution = if facet_res.is_finite() && facet_res > 0.0 {

src/scene/convert/solid3d_tess.rs

@@ -1,6 +1,6 @@
 use codec::entities::acis::{SabReader, SatBody, SatDocument};
 use codec::entities::{Body, Region, Solid3D, Surface};
-use kernel::brep::{self, Body as KernelBody};
+use kernel::brep::Body as KernelBody;
 
 use crate::scene::model::mesh_model::{MeshLodSet, MeshModel};
 
@@ -179,21 +179,8 @@ pub(crate) fn kernel_acis_body(acis: &codec::entities::AcisData) -> Option<Kerne
     if !loss.is_empty() || bodies.len() != 1 {
         return None;
     }
-    let body = bodies.pop()?;
-    let source = body.provenance.source()?;
-    let Some((matrix, translation, scale)) = body_transform(&sat, source.index() as usize).ok()?
-    else {
-        return Some(body);
-    };
-    brep::transform(
-        &body,
-        &brep::Placement {
-            x_axis: [scale * matrix[0], scale * matrix[1], scale * matrix[2]],
-            y_axis: [scale * matrix[3], scale * matrix[4], scale * matrix[5]],
-            z_axis: [scale * matrix[6], scale * matrix[7], scale * matrix[8]],
-            origin: translation,
-        },
-    )
+    // The kernel's lift already applies the body's transform record.
+    bodies.pop()
 }
 
 fn remap_acis_material_bindings(