Appearances on faces, bodies and components (face > body > component > material > imported colour), with names and opacity and a built-in library of 20 (metals, ABS colours, glass, rubber, wood, paint); AppearanceCommand takes bodies, faces (points) or components, a library name or a colour with opacity, or nothing to clear; appearance.library, appearance.list (a body's resolved look and per-face colours); file format 3 turns the old body colour map into body appearances

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

crates/engine/src/cmd/browser.rs

@@ -278,8 +278,11 @@ fn rename_body(s: &mut Session, p: &Value) -> Result<Value> {
     if let Some(m) = d.materials.remove(&old) {
         d.materials.insert(name.to_string(), m);
     }
-    if let Some(c) = d.appearances.remove(&old) {
-        d.appearances.insert(name.to_string(), c);
+    if let Some(c) = d.appearances.bodies.remove(&old) {
+        d.appearances.bodies.insert(name.to_string(), c);
+    }
+    for f in d.appearances.faces.iter_mut().filter(|f| f.body == old) {
+        f.body = name.to_string();
     }
     if let Some(c) = d.body_components.remove(&old) {
         d.body_components.insert(name.to_string(), c);