Reconstruct constant-section meshes as parametric solids

crates/engine/src/cmd/mesh.rs

@@ -0,0 +1,37 @@
+//! Parametric reconstruction of imported mechanical mesh bodies.
+
+use serde_json::Value;
+use solvecraft_doc::FeatureKind;
+use solvecraft_doc::expr::Kind;
+
+use super::{
+    CommandSpec,
+    features::{add_feature, check_expr},
+};
+use crate::{
+    Result, Session,
+    params::{bad, expr, str_},
+};
+
+pub static COMMANDS: &[CommandSpec] = &[
+    CommandSpec::new("mesh.convert", "Convert Mesh", convert)
+        .at("MESH", "MODIFY")
+        .icon("import")
+        .params("body: mesh body name; tolerance?: length expression (default 0.05 mm): reconstruct a closed constant-section mechanical mesh as editable planar and cylindrical faces, with a parametric timeline feature; name?"),
+];
+
+fn convert(s: &mut Session, p: &Value) -> Result<Value> {
+    let cmd = "mesh.convert";
+    let body = str_(p, "body").filter(|b| !b.trim().is_empty()).ok_or_else(|| bad(cmd, "select a mesh body"))?;
+    let state = s.model.state();
+    let source = state.body(body).ok_or_else(|| bad(cmd, format!("no body `{body}`")))?;
+    if !source.body.is_mesh() {
+        return Err(bad(cmd, "select a mesh body"));
+    }
+    if s.doc.model_body_component(source) != s.active_component {
+        return Err(bad(cmd, "activate the mesh body's component before converting it"));
+    }
+    let tolerance = expr(p, "tolerance").unwrap_or_else(|| "0.05 mm".into());
+    check_expr(s, &tolerance, Kind::Length, cmd, "tolerance")?;
+    add_feature(s, p, FeatureKind::MeshConvert { body: body.into(), tolerance })
+}

crates/engine/src/cmd/mod.rs

@@ -26,6 +26,7 @@ mod file;
 mod inspect;
 pub(crate) mod joints;
 mod measure_sel;
+mod mesh;
 pub(crate) mod motion;
 mod parts;
 mod section;
@@ -157,6 +158,7 @@ pub fn command_specs() -> Vec<&'static CommandSpec> {
     v.extend(sketch_project::COMMANDS.iter());
     v.extend(features::COMMANDS.iter());
     v.extend(features_more::COMMANDS.iter());
+    v.extend(mesh::COMMANDS.iter());
     v.extend(construct::COMMANDS.iter());
     v.extend(sheet::COMMANDS.iter());
     v.extend(plastic::COMMANDS.iter());