Sheet metal: sheet.perforate, a perforation field exported to the flat pattern and DXF (#732) (#1041)

Adds sheet.perforate: round holes on a staggered or square grid over the flat sheet, kept clear of edges, cut-outs and bend zones. The holes go to the flat pattern, the DXF and the measured volume rather than the B-rep, so a panel can carry many thousands of them.

crates/doc/src/feature_walk_tests/fixtures.rs

@@ -112,6 +112,10 @@ pub(super) fn fixtures() -> Vec<(&'static str, Value)> {
             json!({"type": "sheet_flange", "edges": [{"point": o, "angle": "flange.e1_angle", "height": "flange.e1_height"}, {"point": o, "angle": null, "height": "flange.e2_height"}], "height": "flange.height", "angle": "flange.angle", "radius": "flange.radius"}),
         ),
         ("sheet_hem", json!({"type": "sheet_hem", "edges": [o], "length": "hem.length", "gap": "hem.gap"})),
+        (
+            "sheet_perforate",
+            json!({"type": "sheet_perforate", "diameter": "perforate.diameter", "pitch": "perforate.pitch", "margin": "perforate.margin"}),
+        ),
         (
             "sheet_fold",
             json!({"type": "sheet_fold", "a": o, "b": [1, 0, 0], "angle": "fold.angle", "radius": "fold.radius", "position": "centerline"}),
@@ -165,8 +169,8 @@ pub(super) fn with_refs(name: &str, mut v: Value) -> Value {
     let extra = match name {
         "extrude" | "extrude_thin" | "revolve" | "sweep" | "pipe" | "coil" | "thicken" => json!({"targets": ["B"]}),
         "fillet_constant" | "fillet_chord" | "fillet_curvature" | "fillet_variable" | "fillet_spline" | "chamfer" | "shell" | "draft"
-        | "offset_face" | "delete_face" | "replace_face" | "sheet_flange" | "sheet_hem" | "sheet_unfold" | "boss" | "lip" | "snap_fit" | "rest"
-        | "surface_offset" => {
+        | "offset_face" | "delete_face" | "replace_face" | "sheet_flange" | "sheet_hem" | "sheet_perforate" | "sheet_unfold" | "boss" | "lip"
+        | "snap_fit" | "rest" | "surface_offset" => {
             json!({"body": "B"})
         }
         "combine" => json!({"target": "B", "tools": ["B"]}),

crates/doc/src/feature_walk_tests/golden_exprs.txt

@@ -244,6 +244,12 @@ sheet_hem
     Length = hem.length (Length)
     Gap = hem.gap (Length)
   expressions: hem.length, hem.gap
+sheet_perforate
+  inputs:
+    Diameter = perforate.diameter (Length)
+    Pitch = perforate.pitch (Length)
+    Margin = perforate.margin (Length)
+  expressions: perforate.diameter, perforate.pitch, perforate.margin
 sheet_fold
   inputs:
     Angle = fold.angle (Angle)

crates/doc/src/feature_walk_tests/golden_refs.txt

@@ -120,6 +120,8 @@ sheet_flange
   remap_bodies: body
 sheet_hem
   remap_bodies: body
+sheet_perforate
+  remap_bodies: body
 sheet_fold
   sketches: [7]
   remap_refs: sketch