refactor(cad): use direct stack dependencies

src/scene/convert/acis_export.rs

@@ -1,30 +1,12 @@
-//! Export a B-rep [`Body`] to an exact ACIS `SatDocument`.
+//! Export a kernel [`Body`] to an exact ACIS `SatDocument`.
 //!
-//! A solid built by the Model tab, by EXTRUDE / REVOLVE, or by a boolean
-//! carries no ACIS geometry of its own, so other CAD applications drop it on
-//! open. Writing the body out as real modeller geometry is what stops that.
-//!
-//! # Exact, not facetted
-//!
-//! The kernel keeps analytic surfaces — a cylinder is a `cylinder` record and
-//! a sphere a `sphere` — so what lands in the document is the shape itself
-//! rather than a triangulation of it. That is the whole reason the Model tab
-//! builds bodies at all: a facetted export is a one-way door, and the next
-//! application to open the file would have no way back to the circle.
-//!
-//! The writing is [`acis::append`], which lives with the codec because it has
-//! to know both sides. What is left here is the small matter of putting one
-//! body into a fresh document.
+//! Analytic surfaces remain analytic instead of becoming facets.
 
-use acadrust::acis::append;
+use cadkernel::acis::append;
 use acadrust::entities::acis::SatDocument;
-use acadrust::kernel::brep::Body;
+use cadkernel::brep::Body;
 
-/// An exact ACIS document holding `body`, or `None` when the kernel has no
-/// record form for something in it — a spline curve, at present.
-///
-/// Refusing is the point: a document missing a face is one that parses into a
-/// different solid, and nothing downstream could tell.
+/// Returns `None` when the body contains an unsupported record form.
 pub fn planar_solid_to_sat(body: &Body) -> Option<SatDocument> {
     let mut document = SatDocument::new();
     append(body, &mut document).ok()?;

src/scene/convert/acis_kernel.rs

@@ -8,9 +8,9 @@
 //!
 //! Lift and tessellation failures are reported as an incomplete result.
 
-use acadrust::acis::lift;
+use cadkernel::acis::lift;
 use acadrust::entities::acis::SatDocument;
-use acadrust::kernel::brep;
+use cadkernel::brep;
 
 use crate::scene::convert::solid3d_tess::{body_transform, finalize_mesh};
 use crate::scene::model::mesh_model::{CurvedGen, MeshLodSet};
@@ -53,7 +53,7 @@ pub fn tessellate_sat(
     } else {
         1.0
     };
-    let max_angle = acadrust::kernel::tessellation::DEFAULT_ANGLE / resolution;
+    let max_angle = cadkernel::tessellation::DEFAULT_ANGLE / resolution;
 
     // Positions stay f64 until `finalize_mesh` splits them into the coarse
     // and fine pair, so a solid at survey coordinates keeps its millimetres.
@@ -240,7 +240,7 @@ mod tests {
 
     #[test]
     fn a_round_surface_gets_the_same_sides_whatever_its_size() {
-        let angle = acadrust::kernel::tessellation::DEFAULT_ANGLE;
+        let angle = cadkernel::tessellation::DEFAULT_ANGLE;
         assert!(sides(angle) > 24.0, "{}", sides(angle));
         assert!(sides(angle) < 96.0, "{}", sides(angle));
     }