Extend any surface: natural, tangent and curvature, up to a target (#760) (#1166)

Extend works on any surface: natural (continuing the face's own surface), tangent (G1 run-off) or curvature (G2 run-off), by a distance, up to a plane or face, or back to the surface's bounds, with neighbouring edges lengthened to meet. Untrim and Extend share face parameter-loop helpers. The new SurfaceExtend fields are noted under format 21. Closes #760.

crates/doc/src/feature_walk_tests/fixtures.rs

@@ -153,6 +153,14 @@ pub(super) fn fixtures() -> Vec<(&'static str, Value)> {
         ("reverse_normal", json!({"type": "reverse_normal", "body": "B"})),
         ("surface_untrim", json!({"type": "surface_untrim", "face": {"body": "B", "point": o}, "holes": [o], "outer": true})),
         ("surface_extend", json!({"type": "surface_extend", "body": "B", "edges": [o], "distance": "extend.distance"})),
+        (
+            "surface_extend_to_plane",
+            json!({"type": "surface_extend", "body": "B", "edges": [o], "distance": "extend.distance", "mode": "curvature", "up_to": {"plane": plane("extend")}}),
+        ),
+        (
+            "surface_extend_to_face",
+            json!({"type": "surface_extend", "body": "B", "edges": [o], "distance": "extend.distance", "up_to": {"face": {"body": "B", "point": o}}, "neighbours": false}),
+        ),
         (
             "surface_ruled",
             json!({"type": "surface_ruled", "body": "B", "edges": [o], "distance": "ruled.distance", "mode": "angle", "angle": "ruled.angle",

crates/doc/src/feature_walk_tests/golden_exprs.txt

@@ -330,6 +330,16 @@ surface_extend
   inputs:
     Distance = extend.distance (Length)
   expressions: extend.distance
+surface_extend_to_plane
+  inputs:
+    Distance = extend.distance (Length)
+    Angle = extend.angle (Angle)
+    Offset = extend.offset (Length)
+  expressions: extend.distance, extend.angle, extend.offset
+surface_extend_to_face
+  inputs:
+    Distance = extend.distance (Length)
+  expressions: extend.distance
 surface_ruled
   inputs:
     Distance = ruled.distance (Length)

crates/doc/src/feature_walk_tests/golden_geometry.txt

@@ -155,6 +155,10 @@ surface_untrim
   face points: [0, 0, 0]
 surface_extend
   moves: edges[0][0], edges[0][1], edges[0][2]
+surface_extend_to_plane
+  moves: edges[0][0], edges[0][1], edges[0][2], up_to.plane.axis_dir[0], up_to.plane.axis_dir[1], up_to.plane.axis_origin[0], up_to.plane.axis_origin[1], up_to.plane.axis_origin[2]
+surface_extend_to_face
+  moves: edges[0][0], edges[0][1], edges[0][2], up_to.face.point[0], up_to.face.point[1], up_to.face.point[2]
 surface_ruled
   moves: direction[0], direction[2], edges[0][0], edges[0][1], edges[0][2], face[1], face[2]
   face points: [1, 0, 0]

crates/doc/src/feature_walk_tests/golden_refs.txt

@@ -172,6 +172,11 @@ surface_untrim
   remap_bodies: face.body
 surface_extend
   remap_bodies: body
+surface_extend_to_plane
+  remap_refs: up_to.plane.base.base.name
+  remap_bodies: body
+surface_extend_to_face
+  remap_bodies: body, up_to.face.body
 surface_ruled
   remap_bodies: body
 surface_trim