Implement solid shell workflow and properties

Cargo.lock

@@ -79,7 +79,7 @@ checksum = "366ffbaa4442f4684d91e2cd7c5ea7c4ed8add41959a31447066e279e432b618"
 [[package]]
 name = "acadrust"
 version = "0.5.4"
-source = "git+https://[email protected]/HakanSeven12/cadcodec.git?rev=5b56571a190e7a17c8f12d36390d2938b0fb72f7#5b56571a190e7a17c8f12d36390d2938b0fb72f7"
+source = "git+https://[email protected]/HakanSeven12/cadcodec.git?rev=ffc58a9ee64b2ee818d7cf1e4d8b27a26becbf01#ffc58a9ee64b2ee818d7cf1e4d8b27a26becbf01"
 dependencies = [
  "ahash 0.8.12",
  "anyhow",
@@ -885,7 +885,7 @@ checksum = "fc652a48c352aef3ea3aed32080501cf3ef6ed5da78602a020c991775b0aff04"
 [[package]]
 name = "cadkernel"
 version = "0.1.0"
-source = "git+https://github.com/HakanSeven12/cadkernel.git?rev=4486076cb003a5909e3383900c596f92ef599192#4486076cb003a5909e3383900c596f92ef599192"
+source = "git+https://github.com/HakanSeven12/cadkernel.git?rev=e0f43546929b6af0e436e710bdfc932161d483a3#e0f43546929b6af0e436e710bdfc932161d483a3"
 dependencies = [
  "acadrust",
  "cavalier_contours",

Cargo.toml

@@ -31,8 +31,8 @@ glam = { version = "0.33", features = ["bytemuck"] }
 rfd = "0.17"
 clap = { version = "4", features = ["derive", "string"] }
 env_logger = "0.11"
-acadrust = { git = "https://github.com/HakanSeven12/cadcodec.git", rev = "5b56571a190e7a17c8f12d36390d2938b0fb72f7", features = ["serde"] }
-cadkernel = { git = "https://github.com/HakanSeven12/cadkernel.git", rev = "4486076cb003a5909e3383900c596f92ef599192", features = ["acis", "offset"] }
+acadrust = { git = "https://github.com/HakanSeven12/cadcodec.git", rev = "ffc58a9ee64b2ee818d7cf1e4d8b27a26becbf01", features = ["serde"] }
+cadkernel = { git = "https://github.com/HakanSeven12/cadkernel.git", rev = "e0f43546929b6af0e436e710bdfc932161d483a3", features = ["acis", "offset"] }
 dwg-thumbnailer = { path = "crates/dwg-thumbnailer" }
 flate2 = "1"
 image = { version = "0.25", default-features = false, features = ["png", "jpeg", "bmp", "tiff"] }
@@ -74,7 +74,7 @@ iced_core = { git = "https://github.com/iced-rs/iced.git", rev = "23604ff22ab0aa
 iced_widget = { git = "https://github.com/iced-rs/iced.git", rev = "23604ff22ab0aad9e00b9327cb7b8546ed84db39" }
 
 [patch."https://github.com/HakanSeven12/cadcodec.git"]
-acadrust = { git = "https://[email protected]/HakanSeven12/cadcodec.git", rev = "5b56571a190e7a17c8f12d36390d2938b0fb72f7" }
+acadrust = { git = "https://[email protected]/HakanSeven12/cadcodec.git", rev = "ffc58a9ee64b2ee818d7cf1e4d8b27a26becbf01" }
 
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]

crates/ocs_doc_api/Cargo.toml

@@ -14,8 +14,8 @@ bincode = "1.3"
 thiserror = "1"
 
 # Host adapters convert ObjectId to acadrust handles; kernel handles stay local.
-acadrust = { git = "https://github.com/HakanSeven12/cadcodec.git", rev = "5b56571a190e7a17c8f12d36390d2938b0fb72f7", features = ["serde"], optional = true }
-cadkernel = { git = "https://github.com/HakanSeven12/cadkernel.git", rev = "4486076cb003a5909e3383900c596f92ef599192", features = ["acis", "offset"], optional = true }
+acadrust = { git = "https://github.com/HakanSeven12/cadcodec.git", rev = "ffc58a9ee64b2ee818d7cf1e4d8b27a26becbf01", features = ["serde"], optional = true }
+cadkernel = { git = "https://github.com/HakanSeven12/cadkernel.git", rev = "e0f43546929b6af0e436e710bdfc932161d483a3", features = ["acis", "offset"], optional = true }
 ocs_plugin_api = { path = "../ocs_plugin_api", optional = true, features = ["host"] }
 
 [build-dependencies]

src/app/command_driver.rs

@@ -2926,6 +2926,14 @@ impl OpenCADStudio {
                     self.command_line.push_info(&prompt);
                 }
             }
+            CmdResult::ReportError(msg) => {
+                self.tabs[i].snap_result = None;
+                self.tabs[i].scene.clear_preview_wire();
+                self.command_line.push_error(&msg);
+                if let Some(prompt) = self.tabs[i].active_cmd.as_ref().map(|c| c.prompt()) {
+                    self.command_line.push_info(&prompt);
+                }
+            }
             CmdResult::ReportMeasurementAndDeselect(msg) => {
                 self.tabs[i].snap_result = None;
                 self.tabs[i].scene.deselect_all();
@@ -4115,6 +4123,19 @@ impl OpenCADStudio {
                 return task;
             }
 
+            CmdResult::SolidShell {
+                handle,
+                actions,
+                distance,
+            } => {
+                let task = self.solid_shell(handle, &actions, distance);
+                self.tabs[i].active_cmd = None;
+                self.tabs[i].snap_result = None;
+                self.tabs[i].scene.clear_preview_wire();
+                self.restore_pre_cmd_tangent();
+                return task;
+            }
+
             CmdResult::SolidSubtract {
                 bases,
                 cutters,

src/app/commands/draw.rs

@@ -971,6 +971,30 @@ impl OpenCADStudio {
                 self.tabs[i].active_cmd = Some(Box::new(new_cmd));
             }
 
+            "SHELL" | "SOLIDEDIT" => {
+                use crate::modules::model::shell_cmd::ShellCommand;
+                let selected = self.tabs[i]
+                    .scene
+                    .selected_handles_in_order()
+                    .into_iter()
+                    .filter(|handle| !self.tabs[i].scene.is_layer_locked(*handle))
+                    .filter(|handle| {
+                        matches!(
+                            self.tabs[i].scene.document.get_entity(*handle),
+                            Some(acadrust::EntityType::Solid3D(_))
+                        )
+                    })
+                    .collect::<Vec<_>>();
+                let target = (selected.len() == 1).then_some(selected[0]);
+                let new_cmd = if cmd == "SHELL" {
+                    ShellCommand::direct(target)
+                } else {
+                    ShellCommand::solid_edit(target)
+                };
+                self.command_line.push_info(&new_cmd.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(new_cmd));
+            }
+
             // ── Solid booleans ─────────────────────────────────────────────
             "UNION" => {
                 use crate::modules::model::boolean_cmd::BoolOp;

src/app/control/mod.rs

@@ -982,7 +982,7 @@ impl OpenCADStudio {
                     "area":planar.curve.is_closed().then(|| planar.curve.enclosed_area().abs())
                 })
             });
-            out.push(json!({"handle":format!("{:X}",handle.value()),"type":crate::entities::names::ui_name(entity),"bounds":{"min":[bb.min.x,bb.min.y,bb.min.z],"max":[bb.max.x,bb.max.y,bb.max.z]},"curve":curve,"mesh":metrics.map(|m|json!({"vertices":m.metrics.vertices,"triangles":m.metrics.triangles,"surface_area":m.metrics.surface_area,"volume":m.metrics.volume,"centroid":m.metrics.centroid}))}));
+            out.push(json!({"handle":format!("{:X}",handle.value()),"type":crate::entities::names::ui_name(entity),"bounds":{"min":[bb.min.x,bb.min.y,bb.min.z],"max":[bb.max.x,bb.max.y,bb.max.z]},"curve":curve,"mesh":metrics.map(|m|json!({"vertices":m.metrics.vertices,"triangles":m.metrics.triangles,"surface_area":m.metrics.surface_area,"volume":m.metrics.volume,"centroid":m.metrics.centroid,"moment_of_inertia":m.metrics.moment_of_inertia,"principal_directions":m.metrics.principal_directions,"principal_moments":m.metrics.principal_moments,"product_of_inertia":m.metrics.product_of_inertia,"radii_of_gyration":m.metrics.radii_of_gyration}))}));
         }
         json!({"ok":true,"document_id":tab.id,"geometry_revision":tab.scene.geometry_epoch,"measurements":out})
     }

src/app/model_ops.rs

@@ -9,7 +9,7 @@ use acadrust::{
 };
 use cadkernel::brep::Body;
 use iced::Task;
-use std::collections::HashMap;
+use std::collections::{HashMap, HashSet};
 
 use super::Message;
 use crate::modules::model::boolean_cmd::BoolOp;
@@ -646,6 +646,107 @@ impl super::OpenCADStudio {
         Task::none()
     }
 
+    pub(super) fn solid_shell(
+        &mut self,
+        handle: Handle,
+        actions: &[crate::command::ShellFaceAction],
+        distance: f64,
+    ) -> Task<Message> {
+        use crate::command::ShellFaceAction;
+
+        let i = self.active_tab;
+        if self.reject_locked_edit(i, handle) {
+            return Task::none();
+        }
+        if !matches!(
+            self.tabs[i].scene.document.get_entity(handle),
+            Some(EntityType::Solid3D(_))
+        ) {
+            self.command_line
+                .push_error(crate::t!("Select a 3D solid.").as_ref());
+            return Task::none();
+        }
+        if !distance.is_finite() || distance.abs() <= f64::EPSILON {
+            self.command_line
+                .push_error(crate::t!("The shell offset distance must be nonzero.").as_ref());
+            return Task::none();
+        }
+
+        self.tabs[i].scene.restore_solid_models(&[handle]);
+        let Some(body) = self.tabs[i].scene.solid_models.get(&handle).cloned() else {
+            self.command_line
+                .push_error(crate::t!("The solid geometry could not be restored.").as_ref());
+            return Task::none();
+        };
+
+        let all_faces = body.face_keys().collect::<Vec<_>>();
+        let mut removed = HashSet::new();
+        for action in actions {
+            match *action {
+                ShellFaceAction::Remove(point) => {
+                    let Some(face) = solid_model::nearest_face(&body, point.to_array()) else {
+                        self.command_line
+                            .push_error(crate::t!("A selected face could not be resolved.").as_ref());
+                        return Task::none();
+                    };
+                    removed.insert(face);
+                }
+                ShellFaceAction::Add(point) => {
+                    let Some(face) = solid_model::nearest_face(&body, point.to_array()) else {
+                        self.command_line
+                            .push_error(crate::t!("A selected face could not be resolved.").as_ref());
+                        return Task::none();
+                    };
+                    removed.remove(&face);
+                }
+                ShellFaceAction::RemoveAll => removed.extend(all_faces.iter().copied()),
+                ShellFaceAction::AddAll => removed.clear(),
+            }
+        }
+        let removed = removed.into_iter().collect::<Vec<_>>();
+
+        let result = match cadkernel::brep::shell(&body, &removed, distance) {
+            Ok(result) => result,
+            Err(cadkernel::brep::ShellError::InvalidDistance) => {
+                self.command_line
+                    .push_error(crate::t!("The shell offset distance must be nonzero.").as_ref());
+                return Task::none();
+            }
+            Err(cadkernel::brep::ShellError::UnsupportedSolid) => {
+                self.command_line.push_error(
+                    crate::t!("SHELL supports rectangular boxes, circular cylinders, and spheres.")
+                        .as_ref(),
+                );
+                return Task::none();
+            }
+            Err(cadkernel::brep::ShellError::UnknownFace) => {
+                self.command_line
+                    .push_error(crate::t!("A selected face does not belong to the solid.").as_ref());
+                return Task::none();
+            }
+            Err(cadkernel::brep::ShellError::NoMaterial) => {
+                self.command_line.push_error(
+                    crate::t!("The offset removes all material. Use a smaller distance or add a face back.")
+                        .as_ref(),
+                );
+                return Task::none();
+            }
+            Err(cadkernel::brep::ShellError::Kernel(_)) => {
+                self.command_line.push_error(
+                    crate::t!("The shell could not be constructed from the selected solid and distance.")
+                        .as_ref(),
+                );
+                return Task::none();
+            }
+        };
+
+        if self.replace_solid_body(handle, result, "SHELL") {
+            self.command_line
+                .push_output(crate::t!("SHELL: solid updated.").as_ref());
+        }
+        Task::none()
+    }
+
     /// Intersect compatible selected solids, Regions, and coplanar Surfaces.
     pub(super) fn solid_intersect(&mut self) -> Task<Message> {
         let i = self.active_tab;

src/app/properties.rs

@@ -636,7 +636,7 @@ impl OpenCADStudio {
                         }
                     }
 
-                    if !compact_solid && matches!(
+                    if matches!(
                         entity,
                         acadrust::EntityType::Solid3D(_)
                             | acadrust::EntityType::Region(_)
@@ -654,38 +654,44 @@ impl OpenCADStudio {
                         {
                             use crate::entities::common::ro_prop;
                             let metrics = mesh.metrics;
-                            let mut props = vec![
-                                ro_prop(
-                                    t!("Vertices").as_ref(),
-                                    "mesh_vertices",
-                                    metrics.vertices.to_string(),
-                                ),
-                                ro_prop(
-                                    t!("Triangles").as_ref(),
-                                    "mesh_triangles",
-                                    metrics.triangles.to_string(),
-                                ),
-                                ro_prop(
-                                    t!("Surface Area").as_ref(),
-                                    "mesh_surface_area",
-                                    format!("{:.6}", metrics.surface_area),
-                                ),
-                                ro_prop(
+                            let triple = |values: [f64; 3]| {
+                                format!("{:.6}, {:.6}, {:.6}", values[0], values[1], values[2])
+                            };
+                            let mut props = if compact_solid {
+                                vec![ro_prop(
                                     t!("Centroid").as_ref(),
                                     "mesh_centroid",
-                                    format!(
-                                        "{:.6}, {:.6}, {:.6}",
-                                        metrics.centroid[0],
-                                        metrics.centroid[1],
-                                        metrics.centroid[2]
+                                    triple(metrics.centroid),
+                                )]
+                            } else {
+                                vec![
+                                    ro_prop(
+                                        t!("Vertices").as_ref(),
+                                        "mesh_vertices",
+                                        metrics.vertices.to_string(),
                                     ),
-                                ),
-                                ro_prop(
-                                    t!("Tessellation").as_ref(),
-                                    "mesh_complete",
-                                    if mesh.complete { "Complete" } else { "Partial" },
-                                ),
-                            ];
+                                    ro_prop(
+                                        t!("Triangles").as_ref(),
+                                        "mesh_triangles",
+                                        metrics.triangles.to_string(),
+                                    ),
+                                    ro_prop(
+                                        t!("Surface Area").as_ref(),
+                                        "mesh_surface_area",
+                                        format!("{:.6}", metrics.surface_area),
+                                    ),
+                                    ro_prop(
+                                        t!("Centroid").as_ref(),
+                                        "mesh_centroid",
+                                        triple(metrics.centroid),
+                                    ),
+                                    ro_prop(
+                                        t!("Tessellation").as_ref(),
+                                        "mesh_complete",
+                                        if mesh.complete { "Complete" } else { "Partial" },
+                                    ),
+                                ]
+                            };
                             if mesh.complete
                                 && matches!(
                                     entity,
@@ -694,14 +700,50 @@ impl OpenCADStudio {
                                         | acadrust::EntityType::Body(_)
                                 )
                             {
-                                props.insert(
-                                    3,
+                                let closed_props = vec![
+                                    ro_prop(
+                                        t!("Moment of inertia").as_ref(),
+                                        "mesh_moment_of_inertia",
+                                        triple(metrics.moment_of_inertia),
+                                    ),
+                                    ro_prop(
+                                        t!("Principal directions").as_ref(),
+                                        "mesh_principal_directions",
+                                        metrics
+                                            .principal_directions
+                                            .chunks_exact(3)
+                                            .map(|axis| format!("({:.6}, {:.6}, {:.6})", axis[0], axis[1], axis[2]))
+                                            .collect::<Vec<_>>()
+                                            .join(", "),
+                                    ),
+                                    ro_prop(
+                                        t!("Principal moments").as_ref(),
+                                        "mesh_principal_moments",
+                                        triple(metrics.principal_moments),
+                                    ),
+                                    ro_prop(
+                                        t!("Product of inertia").as_ref(),
+                                        "mesh_product_of_inertia",
+                                        triple(metrics.product_of_inertia),
+                                    ),
+                                    ro_prop(
+                                        t!("Radii of gyration").as_ref(),
+                                        "mesh_radii_of_gyration",
+                                        triple(metrics.radii_of_gyration),
+                                    ),
                                     ro_prop(
                                         t!("Volume").as_ref(),
                                         "mesh_volume",
                                         format!("{:.6}", metrics.volume),
                                     ),
-                                );
+                                ];
+                                if compact_solid {
+                                    props.extend(closed_props);
+                                } else {
+                                    let volume = closed_props.last().cloned().unwrap();
+                                    props.insert(3, volume);
+                                    props.extend(closed_props.into_iter().take(5));
+                                }
                             }
                             sections.push(crate::scene::model::object::PropSection {
                                 title: t!("Mass Properties").into_owned(),
@@ -3093,7 +3135,8 @@ fn retain_compact_solid_sections(
                     | "transparency"
                     | "hyperlink"
                     | "material"
-            ) || crate::scene::model::solid_history::is_specialized_property(property.field)
+            ) || property.field.starts_with("mesh_")
+                || crate::scene::model::solid_history::is_specialized_property(property.field)
         });
     });
     sections.retain(|section| !section.props.is_empty());

src/command.rs

@@ -1195,6 +1195,15 @@ pub struct LoftOptions {
     pub align_direction: bool,
 }
 
+/// One face-selection edit made while collecting a solid shell operation.
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum ShellFaceAction {
+    Remove(DVec3),
+    Add(DVec3),
+    RemoveAll,
+    AddAll,
+}
+
 impl Default for LoftOptions {
     fn default() -> Self {
         Self {
@@ -1374,6 +1383,8 @@ pub enum CmdResult {
     Measurement(String),
     /// Print a measurement result and keep the command active.
     ReportMeasurement(String),
+    /// Print an input error and keep the command active.
+    ReportError(String),
     /// Print a measurement result, clear the current selection, and keep the command active.
     ReportMeasurementAndDeselect(String),
     /// Clear the current selection and keep the command active at its updated step.
@@ -1554,6 +1565,12 @@ pub enum CmdResult {
         value: f64,
         fillet: bool,
     },
+    /// Offset a solid and optionally open selected faces.
+    SolidShell {
+        handle: Handle,
+        actions: Vec<ShellFaceAction>,
+        distance: f64,
+    },
     SolidSubtract {
         bases: Vec<Handle>,
         cutters: Vec<Handle>,

src/modules/model/mod.rs

@@ -5,6 +5,7 @@ pub mod cylinder_cmd;
 pub mod edge_cmd;
 pub mod polysolid_cmd;
 pub mod primitive_cmd;
+pub mod shell_cmd;
 
 use crate::modules::{CadModule, IconKind, ModuleEvent, RibbonGroup, RibbonItem, ToolDef};
 
@@ -90,6 +91,7 @@ impl CadModule for ModelModule {
                     tools: vec![
                         RibbonItem::LargeTool(tool("SOLIDFILLET", "Fillet", FILLET_ICON)),
                         RibbonItem::LargeTool(tool("SOLIDCHAMFER", "Chamfer", CHAMFER_ICON)),
+                        RibbonItem::LargeTool(tool("SHELL", "Shell", PRESSPULL_ICON)),
                     ],
                 },
             ]

src/modules/model/shell_cmd.rs

@@ -0,0 +1,265 @@
+use acadrust::Handle;
+use glam::DVec3;
+
+use crate::command::{CadCommand, CmdOption, CmdResult, InputKind, ShellFaceAction};
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+enum ShellStep {
+    SolidEditOption,
+    BodyOption,
+    SelectSolid,
+    RemoveFaces,
+    AddFaces,
+    Distance,
+}
+
+pub struct ShellCommand {
+    entry_name: &'static str,
+    step: ShellStep,
+    target: Option<Handle>,
+    actions: Vec<ShellFaceAction>,
+    default_distance: f64,
+}
+
+impl ShellCommand {
+    pub fn direct(target: Option<Handle>) -> Self {
+        Self {
+            entry_name: "SHELL",
+            step: if target.is_some() {
+                ShellStep::RemoveFaces
+            } else {
+                ShellStep::SelectSolid
+            },
+            target,
+            actions: Vec::new(),
+            default_distance: 1.0,
+        }
+    }
+
+    pub fn solid_edit(target: Option<Handle>) -> Self {
+        Self {
+            entry_name: "SOLIDEDIT",
+            step: ShellStep::SolidEditOption,
+            target,
+            actions: Vec::new(),
+            default_distance: 1.0,
+        }
+    }
+
+    fn finish(&mut self, distance: f64) -> CmdResult {
+        let Some(handle) = self.target else {
+            return CmdResult::Cancel;
+        };
+        CmdResult::SolidShell {
+            handle,
+            actions: std::mem::take(&mut self.actions),
+            distance,
+        }
+    }
+
+    fn undo_face_action(&mut self) -> CmdResult {
+        self.actions.pop();
+        CmdResult::NeedPoint
+    }
+
+    fn face_options(add: bool) -> Vec<CmdOption> {
+        if add {
+            vec![
+                CmdOption::new("Undo", "UNDO"),
+                CmdOption::new("Remove", "REMOVE"),
+                CmdOption::new("ALL", "ALL"),
+            ]
+        } else {
+            vec![
+                CmdOption::new("Undo", "UNDO"),
+                CmdOption::new("Add", "ADD"),
+                CmdOption::new("ALL", "ALL"),
+            ]
+        }
+    }
+}
+
+impl CadCommand for ShellCommand {
+    fn name(&self) -> &'static str {
+        self.entry_name
+    }
+
+    fn prompt(&self) -> String {
+        match self.step {
+            ShellStep::SolidEditOption => {
+                crate::t!("Enter a solid editing option [Body/eXit]:").into_owned()
+            }
+            ShellStep::BodyOption => {
+                crate::t!("Enter a body editing option [Shell/eXit]:").into_owned()
+            }
+            ShellStep::SelectSolid => crate::t!("Select a 3D solid:").into_owned(),
+            ShellStep::RemoveFaces => crate::t!(
+                "Select faces to remove [Undo/Add/ALL] <done>:"
+            )
+            .into_owned(),
+            ShellStep::AddFaces => crate::t!(
+                "Select faces to add [Undo/Remove/ALL] <done>:"
+            )
+            .into_owned(),
+            ShellStep::Distance => crate::tf!(
+                "Specify the shell offset distance <{:.3}>:",
+                self.default_distance
+            )
+            .into_owned(),
+        }
+    }
+
+    fn options(&self) -> Vec<CmdOption> {
+        match self.step {
+            ShellStep::SolidEditOption => vec![
+                CmdOption::new("Body", "BODY"),
+                CmdOption::new("eXit", "EXIT"),
+            ],
+            ShellStep::BodyOption => vec![
+                CmdOption::new("Shell", "SHELL"),
+                CmdOption::new("eXit", "EXIT"),
+            ],
+            ShellStep::RemoveFaces => Self::face_options(false),
+            ShellStep::AddFaces => Self::face_options(true),
+            _ => Vec::new(),
+        }
+    }
+
+    fn needs_entity_pick(&self) -> bool {
+        matches!(
+            self.step,
+            ShellStep::SelectSolid | ShellStep::RemoveFaces | ShellStep::AddFaces
+        )
+    }
+
+    fn entity_pick_includes_fills(&self) -> bool {
+        true
+    }
+
+    fn entity_pick_uses_surface_point(&self) -> bool {
+        true
+    }
+
+    fn entity_pick_highlights_hover(&self) -> bool {
+        true
+    }
+
+    fn on_entity_pick(&mut self, handle: Handle, point: DVec3) -> CmdResult {
+        if handle.is_null() {
+            return CmdResult::NeedPoint;
+        }
+        match self.step {
+            ShellStep::SelectSolid => {
+                self.target = Some(handle);
+                self.step = ShellStep::RemoveFaces;
+            }
+            ShellStep::RemoveFaces if self.target == Some(handle) => {
+                self.actions.push(ShellFaceAction::Remove(point));
+            }
+            ShellStep::AddFaces if self.target == Some(handle) => {
+                self.actions.push(ShellFaceAction::Add(point));
+            }
+            _ => {}
+        }
+        CmdResult::NeedPoint
+    }
+
+    fn on_point(&mut self, _point: DVec3) -> CmdResult {
+        CmdResult::NeedPoint
+    }
+
+    fn on_text_input(&mut self, text: &str) -> Option<CmdResult> {
+        let value = text.trim();
+        let keyword = value.to_ascii_uppercase();
+        let result = match self.step {
+            ShellStep::SolidEditOption => match keyword.as_str() {
+                "B" | "BODY" => {
+                    self.step = ShellStep::BodyOption;
+                    CmdResult::NeedPoint
+                }
+                "X" | "EXIT" => CmdResult::Cancel,
+                _ => return Some(CmdResult::NeedPoint),
+            },
+            ShellStep::BodyOption => match keyword.as_str() {
+                "S" | "SHELL" => {
+                    self.step = if self.target.is_some() {
+                        ShellStep::RemoveFaces
+                    } else {
+                        ShellStep::SelectSolid
+                    };
+                    CmdResult::NeedPoint
+                }
+                "X" | "EXIT" => CmdResult::Cancel,
+                _ => return Some(CmdResult::NeedPoint),
+            },
+            ShellStep::RemoveFaces => match keyword.as_str() {
+                "U" | "UNDO" => return Some(self.undo_face_action()),
+                "A" | "ADD" => {
+                    self.step = ShellStep::AddFaces;
+                    CmdResult::NeedPoint
+                }
+                "ALL" => {
+                    self.actions.push(ShellFaceAction::RemoveAll);
+                    CmdResult::NeedPoint
+                }
+                _ => return Some(CmdResult::NeedPoint),
+            },
+            ShellStep::AddFaces => match keyword.as_str() {
+                "U" | "UNDO" => return Some(self.undo_face_action()),
+                "R" | "REMOVE" => {
+                    self.step = ShellStep::RemoveFaces;
+                    CmdResult::NeedPoint
+                }
+                "ALL" => {
+                    self.actions.push(ShellFaceAction::AddAll);
+                    CmdResult::NeedPoint
+                }
+                _ => return Some(CmdResult::NeedPoint),
+            },
+            ShellStep::Distance => {
+                let Ok(distance) = value.parse::<f64>() else {
+                    return Some(CmdResult::ReportError(
+                        crate::t!("A numeric shell offset distance is required.").into_owned(),
+                    ));
+                };
+                if !distance.is_finite() || distance.abs() <= f64::EPSILON {
+                    return Some(CmdResult::ReportError(
+                        crate::t!("Value must be nonzero.").into_owned(),
+                    ));
+                }
+                self.default_distance = distance;
+                self.finish(distance)
+            }
+            ShellStep::SelectSolid => return None,
+        };
+        Some(result)
+    }
+
+    fn on_enter(&mut self) -> CmdResult {
+        match self.step {
+            ShellStep::RemoveFaces | ShellStep::AddFaces => {
+                self.step = ShellStep::Distance;
+                CmdResult::NeedPoint
+            }
+            ShellStep::Distance => self.finish(self.default_distance),
+            _ => CmdResult::Cancel,
+        }
+    }
+
+    fn on_undo_step(&mut self) -> Option<CmdResult> {
+        matches!(self.step, ShellStep::RemoveFaces | ShellStep::AddFaces)
+            .then(|| self.undo_face_action())
+    }
+
+    fn input_kind(&self) -> InputKind {
+        if matches!(self.step, ShellStep::SelectSolid) {
+            InputKind::Point
+        } else {
+            InputKind::SingleToken
+        }
+    }
+}
+
+inventory::submit!(crate::command::CommandRegistration {
+    names: &["SHELL", "SOLIDEDIT"]
+});

src/scene/convert/acis_kernel.rs

@@ -177,6 +177,11 @@ pub fn tessellate_sat(
         color,
         None,
     ));
+    if let [single] = bodies.as_slice() {
+        if let Some(properties) = brep::analytic_mass_properties(&single.0) {
+            set.apply_mass_properties(properties);
+        }
+    }
     set.curved_gens = curved_gens;
     for point in edges {
         let high = [point[0] as f32, point[1] as f32, point[2] as f32];

src/scene/model/mesh_model.rs

@@ -55,6 +55,42 @@ pub struct MeshMetrics {
     pub surface_area: f64,
     pub volume: f64,
     pub centroid: [f64; 3],
+    pub moment_of_inertia: [f64; 3],
+    pub principal_directions: [f64; 9],
+    pub principal_moments: [f64; 3],
+    pub product_of_inertia: [f64; 3],
+    pub radii_of_gyration: [f64; 3],
+}
+
+impl MeshMetrics {
+    pub fn translate(&mut self, delta: [f64; 3]) {
+        let old = self.centroid;
+        let new = [old[0] + delta[0], old[1] + delta[1], old[2] + delta[2]];
+        if self.volume > 1e-18 {
+            self.moment_of_inertia[0] += self.volume
+                * (new[1] * new[1] + new[2] * new[2]
+                    - old[1] * old[1]
+                    - old[2] * old[2]);
+            self.moment_of_inertia[1] += self.volume
+                * (new[0] * new[0] + new[2] * new[2]
+                    - old[0] * old[0]
+                    - old[2] * old[2]);
+            self.moment_of_inertia[2] += self.volume
+                * (new[0] * new[0] + new[1] * new[1]
+                    - old[0] * old[0]
+                    - old[1] * old[1]);
+            self.product_of_inertia[0] -=
+                self.volume * (new[0] * new[1] - old[0] * old[1]);
+            self.product_of_inertia[1] -=
+                self.volume * (new[1] * new[2] - old[1] * old[2]);
+            self.product_of_inertia[2] -=
+                self.volume * (new[2] * new[0] - old[2] * old[0]);
+            self.radii_of_gyration = self
+                .moment_of_inertia
+                .map(|moment| (moment.max(0.0) / self.volume).sqrt());
+        }
+        self.centroid = new;
+    }
 }
 
 #[derive(Clone, Debug)]
@@ -160,6 +196,8 @@ fn compute_mesh_metrics(lods: &[MeshModel]) -> MeshMetrics {
     let mut area_centroid_numerator = [0.0; 3];
     let mut signed_volume = 0.0;
     let mut centroid_numerator = [0.0; 3];
+    let mut squared_integrals = [0.0; 3];
+    let mut product_integrals = [0.0; 3];
     for triangle in mesh.indices.chunks_exact(3) {
         let a = point(triangle[0]);
         let b = point(triangle[1]);
@@ -187,6 +225,25 @@ fn compute_mesh_metrics(lods: &[MeshModel]) -> MeshMetrics {
         signed_volume += tetra;
         for axis in 0..3 {
             centroid_numerator[axis] += tetra * (a[axis] + b[axis] + c[axis]) / 4.0;
+            squared_integrals[axis] += tetra
+                * (a[axis] * a[axis]
+                    + b[axis] * b[axis]
+                    + c[axis] * c[axis]
+                    + a[axis] * b[axis]
+                    + a[axis] * c[axis]
+                    + b[axis] * c[axis])
+                / 10.0;
+        }
+        for (index, (first, second)) in [(0usize, 1usize), (1, 2), (2, 0)]
+            .into_iter()
+            .enumerate()
+        {
+            let diagonal = a[first] * a[second]
+                + b[first] * b[second]
+                + c[first] * c[second];
+            let all = (a[first] + b[first] + c[first])
+                * (a[second] + b[second] + c[second]);
+            product_integrals[index] += tetra * (diagonal + all) / 20.0;
         }
     }
     let centroid = if signed_volume.abs() > 1e-18 {
@@ -204,16 +261,120 @@ fn compute_mesh_metrics(lods: &[MeshModel]) -> MeshMetrics {
     } else {
         [0.0; 3]
     };
+    let orientation = if signed_volume < 0.0 { -1.0 } else { 1.0 };
+    let volume = signed_volume.abs();
+    let square = squared_integrals.map(|value| value * orientation);
+    let products = product_integrals.map(|value| -value * orientation);
+    let moment_of_inertia = [
+        square[1] + square[2],
+        square[0] + square[2],
+        square[0] + square[1],
+    ];
+    let central = [
+        [
+            moment_of_inertia[0] - volume * (centroid[1].powi(2) + centroid[2].powi(2)),
+            products[0] + volume * centroid[0] * centroid[1],
+            products[2] + volume * centroid[0] * centroid[2],
+        ],
+        [
+            products[0] + volume * centroid[0] * centroid[1],
+            moment_of_inertia[1] - volume * (centroid[0].powi(2) + centroid[2].powi(2)),
+            products[1] + volume * centroid[1] * centroid[2],
+        ],
+        [
+            products[2] + volume * centroid[0] * centroid[2],
+            products[1] + volume * centroid[1] * centroid[2],
+            moment_of_inertia[2] - volume * (centroid[0].powi(2) + centroid[1].powi(2)),
+        ],
+    ];
+    let (principal_moments, principal_directions) = principal_axes(central);
+    let radii_of_gyration = if volume > 1e-18 {
+        moment_of_inertia.map(|moment| (moment.max(0.0) / volume).sqrt())
+    } else {
+        [0.0; 3]
+    };
     MeshMetrics {
         vertices: mesh.verts.len(),
         triangles: mesh.indices.len() / 3,
         surface_area: area,
-        volume: signed_volume.abs(),
+        volume,
         centroid,
+        moment_of_inertia,
+        principal_directions,
+        principal_moments,
+        product_of_inertia: products,
+        radii_of_gyration,
     }
 }
 
+fn principal_axes(mut matrix: [[f64; 3]; 3]) -> ([f64; 3], [f64; 9]) {
+    let mut vectors = [[1.0, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 1.0]];
+    for _ in 0..24 {
+        let (p, q) = [(0usize, 1usize), (0, 2), (1, 2)]
+            .into_iter()
+            .max_by(|&(ap, aq), &(bp, bq)| {
+                matrix[ap][aq].abs().total_cmp(&matrix[bp][bq].abs())
+            })
+            .unwrap_or((0, 1));
+        if matrix[p][q].abs() <= 1e-12 {
+            break;
+        }
+        let angle = 0.5 * (2.0 * matrix[p][q]).atan2(matrix[q][q] - matrix[p][p]);
+        let (sine, cosine) = angle.sin_cos();
+        for row in 0..3 {
+            let mp = matrix[row][p];
+            let mq = matrix[row][q];
+            matrix[row][p] = cosine * mp - sine * mq;
+            matrix[row][q] = sine * mp + cosine * mq;
+        }
+        for column in 0..3 {
+            let mp = matrix[p][column];
+            let mq = matrix[q][column];
+            matrix[p][column] = cosine * mp - sine * mq;
+            matrix[q][column] = sine * mp + cosine * mq;
+        }
+        for row in 0..3 {
+            let vp = vectors[row][p];
+            let vq = vectors[row][q];
+            vectors[row][p] = cosine * vp - sine * vq;
+            vectors[row][q] = sine * vp + cosine * vq;
+        }
+    }
+    let mut axes = (0..3)
+        .map(|axis| {
+            (
+                matrix[axis][axis].max(0.0),
+                [vectors[0][axis], vectors[1][axis], vectors[2][axis]],
+            )
+        })
+        .collect::<Vec<_>>();
+    axes.sort_by(|left, right| left.0.total_cmp(&right.0));
+    let moments = [axes[0].0, axes[1].0, axes[2].0];
+    let scale = moments[2].abs().max(1.0);
+    if (moments[2] - moments[0]).abs() <= scale * 1e-10 {
+        return (
+            moments,
+            [1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0],
+        );
+    }
+    let directions = [
+        axes[0].1[0], axes[0].1[1], axes[0].1[2], axes[1].1[0], axes[1].1[1],
+        axes[1].1[2], axes[2].1[0], axes[2].1[1], axes[2].1[2],
+    ];
+    (moments, directions)
+}
+
 impl MeshLodSet {
+    pub fn apply_mass_properties(&mut self, properties: cadkernel::brep::MassProperties) {
+        self.metrics.volume = properties.volume;
+        self.metrics.centroid = properties.centroid;
+        self.metrics.moment_of_inertia = properties.moment_of_inertia;
+        self.metrics.principal_directions = properties.principal_directions;
+        self.metrics.principal_moments = properties.principal_moments;
+        self.metrics.product_of_inertia = properties.product_of_inertia;
+        self.metrics.radii_of_gyration = properties.radii_of_gyration;
+    }
+
     /// Build a set from its LODs, computing the 3D AABB.
     pub fn from_lods(lods: Vec<MeshModel>) -> Self {
         let (world_aabb, z_aabb) = compute_mesh_aabb(&lods);

src/scene/model/solid_history.rs

@@ -996,9 +996,44 @@ fn brep_properties(
         history_flags(document, handle).unwrap_or((false, false, 1));
     let (show_history, show_history_editable) =
         displayed_history_state(object_show_history, show_history_mode);
-    vec![PropSection {
-        title: t!("Solid History").into_owned(),
-        props: vec![
+    let mut geometry = vec![Property {
+        label: t!("Solid type").into_owned(),
+        field: "solid_history_type",
+        value: PropValue::ReadOnly(t!("3D Solid").into_owned()),
+    }];
+    if let Some(position) = document
+        .solid_history_operation(handle)
+        .and_then(|operation| match operation {
+            SolidHistoryOperation::Brep(value) => world_point(value.base.transform, [0.0; 3]),
+            _ => None,
+        })
+    {
+        geometry.extend([
+            crate::entities::common::edit_prop(
+                t!("Position X").as_ref(),
+                PROP_POSITION_X,
+                position.x,
+            ),
+            crate::entities::common::edit_prop(
+                t!("Position Y").as_ref(),
+                PROP_POSITION_Y,
+                position.y,
+            ),
+            crate::entities::common::edit_prop(
+                t!("Position Z").as_ref(),
+                PROP_POSITION_Z,
+                position.z,
+            ),
+        ]);
+    }
+    vec![
+        PropSection {
+            title: t!("Geometry").into_owned(),
+            props: geometry,
+        },
+        PropSection {
+            title: t!("Solid History").into_owned(),
+            props: vec![
             Property {
                 label: t!("History").into_owned(),
                 field: PROP_HISTORY,
@@ -1020,7 +1055,8 @@ fn brep_properties(
                 },
             },
         ],
-    }]
+        },
+    ]
 }
 
 fn cylinder_properties(
@@ -2186,11 +2222,50 @@ fn set_pyramid_sides(value: &mut SolidHistoryPyramid, sides: i32) -> bool {
     true
 }
 
+fn apply_brep_position_property(
+    value: &mut SolidHistoryBrep,
+    field: &str,
+    text: &str,
+) -> Option<bool> {
+    let axis = match field {
+        PROP_POSITION_X => 0,
+        PROP_POSITION_Y => 1,
+        PROP_POSITION_Z => 2,
+        _ => return None,
+    };
+    let Some(target) = crate::entities::common::parse_length(text) else {
+        return Some(false);
+    };
+    if !target.is_finite() {
+        return Some(false);
+    }
+    let Some(current) = matrix(value.base.transform) else {
+        return Some(false);
+    };
+    let position = current.transform_point3(glam::DVec3::ZERO);
+    let mut next = position;
+    next[axis] = target;
+    if next == position {
+        return Some(true);
+    }
+    let updated = glam::DMat4::from_translation(next - position) * current;
+    if !updated.is_finite() || updated.determinant().abs() <= 1e-12 {
+        return Some(false);
+    }
+    value.base.transform = updated.to_cols_array();
+    Some(true)
+}
+
 pub fn apply_primitive_property(
     operation: &mut SolidHistoryOperation,
     field: &str,
     value: &str,
 ) -> bool {
+    if let SolidHistoryOperation::Brep(brep_value) = operation {
+        if let Some(applied) = apply_brep_position_property(brep_value, field, value) {
+            return applied;
+        }
+    }
     if let SolidHistoryOperation::Box(rectangular_value)
     | SolidHistoryOperation::Wedge(rectangular_value) = operation
     {

src/scene/model/solid_model.rs

@@ -337,6 +337,18 @@ pub fn nearest_planar_face(body: &Body, pick: [f64; 3]) -> Option<FaceKey> {
     matches!(body.surfaces.get(node.surface)?, Surface::Plane(_)).then_some(face)
 }
 
+/// Face nearest a world-space surface pick, including curved surfaces.
+pub fn nearest_face(body: &Body, pick: [f64; 3]) -> Option<FaceKey> {
+    body.face_keys()
+        .filter_map(|key| {
+            let face = body.faces.get(key)?;
+            let surface = body.surfaces.get(face.surface)?;
+            Some((key, surface.distance_to(pick).abs()))
+        })
+        .min_by(|a, b| a.1.total_cmp(&b.1))
+        .map(|(key, _)| key)
+}
+
 /// Outward normal of a planar face.
 pub fn planar_face_normal(body: &Body, face: FaceKey) -> Option<[f64; 3]> {
     let face = body.faces.get(face)?;
@@ -475,7 +487,11 @@ pub fn display_from_solid(
             )
         })
         .collect();
-    Some((mesh_from_tessellation(tessellation, color)?, wires, center))
+    let mut mesh = mesh_from_tessellation(tessellation, color)?;
+    if let Some(properties) = cadkernel::brep::analytic_mass_properties(body) {
+        mesh.apply_mass_properties(properties);
+    }
+    Some((mesh, wires, center))
 }
 
 /// The middle of a body, for a caller needing a point to turn or scale about.

src/scene/modify.rs

@@ -1235,9 +1235,7 @@ impl Scene {
                 generator.source = source;
             }
         }
-        set.metrics.centroid[0] += delta[0];
-        set.metrics.centroid[1] += delta[1];
-        set.metrics.centroid[2] += delta[2];
+        set.metrics.translate(delta);
         set.recompute_aabb();
     }