Import glTF 2.0 files (.glb, .gltf) as mesh bodies (#1512)

glTF files open, insert and drop like 3MF/STL/OBJ: a component named after the file, the node tree as nested rigid components, repeated meshes as occurrences, metres to mm, Y up turned to Z up by default (up: z keeps axes), materials as PBR appearances. Bounded, hostile-input tested reader; no new persisted data. Closes #1505.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/solidcraft-web/src/files.rs

@@ -458,7 +458,7 @@ fn input_picker(files: &Rc<Files>, intent: Intent) {
     let Some(doc) = web_sys::window().and_then(|w| w.document()) else { return };
     let Ok(input) = doc.create_element("input").map(|e| e.unchecked_into::<web_sys::HtmlInputElement>()) else { return };
     input.set_type("file");
-    input.set_accept(".solidcraft,.solvecraft,.json,.step,.stp,.3mf,.stl");
+    input.set_accept(".solidcraft,.solvecraft,.json,.step,.stp,.3mf,.stl,.obj,.glb,.gltf");
     // Attached (hidden) while it is open: some browsers ignore a click on a detached input.
     let _ = input.set_attribute("style", "display:none");
     if let Some(body) = doc.body() {

apps/solidcraft-web/src/main.rs

@@ -85,7 +85,16 @@ mod web {
             for (text, error) in self.files.messages.borrow_mut().drain(..) {
                 self.app.set_status(text, error);
             }
-            let incoming: Vec<_> = self.files.incoming.borrow_mut().drain(..).collect();
+            let mut incoming: Vec<_> = self.files.incoming.borrow_mut().drain(..).collect();
+            // A glTF file's buffers picked with it are kept next to it, not opened.
+            incoming.retain_mut(|(name, bytes, _)| {
+                let companion =
+                    std::path::Path::new(name.as_str()).extension().and_then(|e| e.to_str()).is_some_and(|e| e.eq_ignore_ascii_case("bin"));
+                if companion {
+                    vfs::insert(&format!("{}{name}", files::UPLOAD), std::mem::take(bytes));
+                }
+                !companion
+            });
             for (name, bytes, intent) in incoming {
                 let design = solidcraft_engine::io::is_design_path(&name);
                 let path = if design && intent == Intent::Open {

apps/solidcraft/src/main.rs

@@ -6,7 +6,7 @@
 //! the software renderer; see `startup` and docs/book/src/guide/troubleshooting.md.
 //!
 //! A `.step`/`.stp` file opens as a new design holding the file's bodies (an Import feature); a
-//! `.3mf`/`.stl` file as a new design holding mesh bodies.
+//! `.3mf`/`.stl`/`.obj`/`.glb`/`.gltf` file as a new design holding mesh bodies.
 //!
 //! `--control <port>` (or `SOLIDCRAFT_CONTROL_PORT`) starts a localhost JSON-lines control
 //! server: `{"id":1,"method":"engine.execute","params":{"command":"solid.box","params":{…}}}`.
@@ -125,12 +125,18 @@ fn services(cc: &eframe::CreationContext<'_>) -> Services {
                         "3MF",
                         "stl",
                         "STL",
+                        "obj",
+                        "OBJ",
+                        "glb",
+                        "GLB",
+                        "gltf",
+                        "GLTF",
                     ],
                 )
                 .add_filter("SolidCraft design (container or JSON)", &[io::DESIGN_EXT, io::LEGACY_DESIGN_EXT, "json"])
                 .add_filter("STEP", &["step", "stp", "STEP", "STP"])
                 .add_filter("IGES", &["igs", "iges", "IGS", "IGES"])
-                .add_filter("Mesh (3MF, STL)", &["3mf", "3MF", "stl", "STL"])
+                .add_filter("Mesh (3MF, STL, OBJ, glTF)", &["3mf", "3MF", "stl", "STL", "obj", "OBJ", "glb", "GLB", "gltf", "GLTF"])
                 .add_filter("Sketch drawings (DXF, SVG)", &["dxf", "DXF", "svg", "SVG"])
                 .add_filter("All files", &["*"])
                 .pick_file();