diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index 4f968382..8d71e64d 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -78,6 +78,10 @@ pub enum Kind {
     Sweep {
         operation: usize,
     },
+    /// Physical material (and with it the appearance) of bodies.
+    Material {
+        index: usize,
+    },
     /// Section Analysis: cut the view by a plane, moved along its normal.
     Section {
         offset: String,
@@ -202,6 +206,7 @@ impl Dialog {
             "MirrorCommand" => {
                 Dialog::new(Kind::Mirror, vec![SelInput::new("Bodies", BODIES, true), SelInput::new("Mirror plane", PLANES | PLANAR_FACES, false)])
             }
+            "PhysicalMaterialCommand" => Dialog::new(Kind::Material { index: 1 }, vec![SelInput::new("Bodies", BODIES, true)]),
             "FusionHalfSectionViewCommand" => {
                 Dialog::new(Kind::Section { offset: "0 mm".into(), flip: false }, vec![SelInput::new("Plane", PLANES | PLANAR_FACES, false)])
             }
@@ -489,6 +494,7 @@ fn title(k: &Kind) -> &'static str {
         Kind::Draft { .. } => "DRAFT",
         Kind::Mirror => "MIRROR",
         Kind::Measure { .. } => "MEASURE",
+        Kind::Material { .. } => "PHYSICAL MATERIAL",
         Kind::Section { .. } => "SECTION ANALYSIS",
         Kind::PatternRect { .. } => "RECTANGULAR PATTERN",
         Kind::PatternCirc { .. } => "CIRCULAR PATTERN",
@@ -749,6 +755,12 @@ pub fn show(app: &mut SolveApp, ctx: &egui::Context) {
                     }
                     Kind::Mirror => {}
                     Kind::Measure { result, .. } => measure_rows(ui, result.as_ref()),
+                    Kind::Material { index } => {
+                        let names: Vec<&str> = solvecraft_engine::doc::MATERIALS.iter().map(|(n, _)| *n).collect();
+                        ui.label("Material");
+                        combo(ui, "mat", &names, index);
+                        ui.end_row();
+                    }
                     Kind::Section { offset, flip } => {
                         ui.label("Distance");
                         enter |= field(ui, offset);
@@ -902,7 +914,8 @@ pub fn show(app: &mut SolveApp, ctx: &egui::Context) {
     let (enter_free, esc) = ctx.input(|i| (i.key_pressed(egui::Key::Enter), i.key_pressed(egui::Key::Escape)));
     let nothing_focused = ctx.memory(|m| m.focused().is_none());
     let canvas_enter = enter_free && ctx.memory(|m| m.had_focus_last_frame(egui::Id::new("sc_canvas_value")));
-    if d.previews() && (enter || canvas_enter || (enter_free && nothing_focused)) {
+    let enter_applies = !matches!(d.kind, Kind::Sketch | Kind::Params { .. } | Kind::Measure { .. } | Kind::ConfirmDelete { .. });
+    if enter_applies && (enter || canvas_enter || (enter_free && nothing_focused)) {
         ok = true;
     }
     if esc {
@@ -1212,6 +1225,11 @@ fn dialog_commands(app: &SolveApp, d: &Dialog) -> Result<Vec<(String, Value)>, S
                 json!({"sketch": sketch, "profiles": idx, "path_sketch": path_sketch, "path": path, "operation": OPS.get(*operation).copied().unwrap_or("new")}),
             )
         }
+        Kind::Material { index } => {
+            need(0, "bodies")?;
+            let name = solvecraft_engine::doc::MATERIALS.get(*index).map(|(n, _)| *n).unwrap_or("Default");
+            ("PhysicalMaterialCommand", json!({"bodies": body_names(0), "material": name}))
+        }
         Kind::Section { offset, flip } => {
             need(0, "a plane or planar face")?;
             let plane = match sels(d, 0).first() {
diff --git a/crates/ui-egui/src/theme.rs b/crates/ui-egui/src/theme.rs
index e4f02fbc..d0d2f41e 100644
--- a/crates/ui-egui/src/theme.rs
+++ b/crates/ui-egui/src/theme.rs
@@ -239,6 +239,26 @@ impl Tokens {
     }
 }
 
+/// How a physical material looks (the default appearance follows the material).
+pub fn material_color(name: &str) -> Option<Color32> {
+    Some(match name {
+        "Steel" => Color32::from_rgb(158, 164, 172),
+        "Stainless Steel" => Color32::from_rgb(186, 191, 198),
+        "Aluminum" => Color32::from_rgb(204, 208, 214),
+        "Brass" => Color32::from_rgb(208, 172, 88),
+        "Copper" => Color32::from_rgb(204, 122, 80),
+        "Titanium" => Color32::from_rgb(150, 148, 158),
+        "Cast Iron" => Color32::from_rgb(104, 104, 110),
+        "ABS Plastic" => Color32::from_rgb(222, 222, 216),
+        "PLA" => Color32::from_rgb(110, 160, 222),
+        "Nylon" => Color32::from_rgb(236, 230, 214),
+        "Polycarbonate" => Color32::from_rgb(196, 216, 232),
+        "Oak" => Color32::from_rgb(190, 146, 92),
+        "Glass" => Color32::from_rgb(170, 208, 218),
+        _ => return None,
+    })
+}
+
 /// Switch themes (the visuals follow on the next [`apply`]).
 pub fn set_dark(dark: bool) {
     DARK.store(dark, Ordering::Relaxed);
diff --git a/crates/ui-egui/src/viewport.rs b/crates/ui-egui/src/viewport.rs
index 4a70f6dd..2c4a2ace 100644
--- a/crates/ui-egui/src/viewport.rs
+++ b/crates/ui-egui/src/viewport.rs
@@ -195,7 +195,7 @@ fn build_scene(app: &SolveApp) -> GpuScene {
         if app.ui.hidden_bodies.contains(&b.name) || app.preview.replaced.contains(&b.name) {
             continue;
         }
-        let col = c4(tk.body);
+        let col = c4(s.doc.materials.get(&b.name).and_then(|m| crate::theme::material_color(m)).unwrap_or(tk.body));
         let m = b.mesh();
         for t in &m.triangles {
             for k in t {
@@ -663,8 +663,8 @@ fn build_highlight(app: &SolveApp) -> GpuScene {
     // Bodies made by the timeline item under the cursor.
     if let Some(fid) = app.viewport.hover_feature {
         let k = t.hover_face_lift;
-        let c = (t.body.r(), t.body.g(), t.body.b());
         for b in st.bodies.iter().filter(|b| b.feature == fid && !app.ui.hidden_bodies.contains(&b.name)) {
+            let c = body_rgb(app, &b.name);
             let m = b.mesh();
             for f in 0..b.body.face_count() {
                 face_tris(&mut sc, &m, f, [c.0.saturating_add(k), c.1.saturating_add(k), c.2.saturating_add(k), 255], true);
@@ -682,7 +682,7 @@ fn build_highlight(app: &SolveApp) -> GpuScene {
         Some(Hit::Face { body, .. }) if app.ui.pick_bodies && app.dialog.is_none() && app.tool.is_none() => {
             if let Some(b) = st.body(body) {
                 let k = t.hover_face_lift;
-                let c = (t.body.r(), t.body.g(), t.body.b());
+                let c = body_rgb(app, body);
                 let m = b.mesh();
                 for f in 0..b.body.face_count() {
                     face_tris(&mut sc, &m, f, [c.0.saturating_add(k), c.1.saturating_add(k), c.2.saturating_add(k), 255], true);
@@ -695,7 +695,7 @@ fn build_highlight(app: &SolveApp) -> GpuScene {
         {
             if let Some(b) = st.body(body) {
                 let k = t.hover_face_lift;
-                let c = (t.body.r(), t.body.g(), t.body.b());
+                let c = body_rgb(app, body);
                 face_tris(&mut sc, &b.mesh(), *index, [c.0.saturating_add(k), c.1.saturating_add(k), c.2.saturating_add(k), 255], true);
                 let m = b.mesh();
                 for e in m.face_edges(u32::try_from(*index).unwrap_or(u32::MAX)) {
@@ -727,6 +727,12 @@ fn build_highlight(app: &SolveApp) -> GpuScene {
     sc
 }
 
+/// A body's display colour (its material's, else the theme's) as RGB.
+fn body_rgb(app: &SolveApp, name: &str) -> (u8, u8, u8) {
+    let c = app.session.doc.materials.get(name).and_then(|m| crate::theme::material_color(m)).unwrap_or(Tokens::get().body);
+    (c.r(), c.g(), c.b())
+}
+
 fn polyline_mid(pts: &[Vec3]) -> Vec3 {
     let len: f64 = pts.windows(2).map(|w| w[0].dist(w[1])).sum();
     let mut acc = 0.0;