Loading of complex scene graphs is now working well!

Managed to load a huge glb file, not included in commit cause I don't want to use
lots of storage in git lfs

assets/test_scene.mtl

@@ -1,2 +0,0 @@
-# Blender 4.0.2 MTL File: 'None'
-# www.blender.org

assets/test_scene.obj

@@ -1,303 +0,0 @@
-# Blender 4.0.2
-# www.blender.org
-mtllib test_scene.mtl
-o Cube
-v -1.000000 -1.000000 1.000000
-v -1.000000 1.000000 1.000000
-v -1.000000 -1.000000 -1.000000
-v -1.000000 1.000000 -1.000000
-v 1.000000 -1.000000 1.000000
-v 1.000000 1.000000 1.000000
-v 1.000000 -1.000000 -1.000000
-v 1.000000 1.000000 -1.000000
-vn -1.0000 -0.0000 -0.0000
-vn -0.0000 -0.0000 -1.0000
-vn 1.0000 -0.0000 -0.0000
-vn -0.0000 -0.0000 1.0000
-vn -0.0000 -1.0000 -0.0000
-vn -0.0000 1.0000 -0.0000
-vt 0.375000 0.000000
-vt 0.625000 0.000000
-vt 0.625000 0.250000
-vt 0.375000 0.250000
-vt 0.625000 0.500000
-vt 0.375000 0.500000
-vt 0.625000 0.750000
-vt 0.375000 0.750000
-vt 0.625000 1.000000
-vt 0.375000 1.000000
-vt 0.125000 0.500000
-vt 0.125000 0.750000
-vt 0.875000 0.500000
-vt 0.875000 0.750000
-s 0
-f 1/1/1 2/2/1 4/3/1 3/4/1
-f 3/4/2 4/3/2 8/5/2 7/6/2
-f 7/6/3 8/5/3 6/7/3 5/8/3
-f 5/8/4 6/7/4 2/9/4 1/10/4
-f 3/11/5 7/6/5 5/8/5 1/12/5
-f 8/5/6 4/13/6 2/14/6 6/7/6
-o Cylinder
-v -4.365820 -1.000000 -1.000000
-v -4.365820 1.000000 -1.000000
-v -4.170730 -1.000000 -0.980785
-v -4.170730 1.000000 -0.980785
-v -3.983137 -1.000000 -0.923880
-v -3.983137 1.000000 -0.923880
-v -3.810250 -1.000000 -0.831470
-v -3.810250 1.000000 -0.831470
-v -3.658714 -1.000000 -0.707107
-v -3.658714 1.000000 -0.707107
-v -3.534351 -1.000000 -0.555570
-v -3.534351 1.000000 -0.555570
-v -3.441941 -1.000000 -0.382683
-v -3.441941 1.000000 -0.382683
-v -3.385035 -1.000000 -0.195090
-v -3.385035 1.000000 -0.195090
-v -3.365820 -1.000000 0.000000
-v -3.365820 1.000000 0.000000
-v -3.385035 -1.000000 0.195090
-v -3.385035 1.000000 0.195090
-v -3.441941 -1.000000 0.382683
-v -3.441941 1.000000 0.382683
-v -3.534351 -1.000000 0.555570
-v -3.534351 1.000000 0.555570
-v -3.658714 -1.000000 0.707107
-v -3.658714 1.000000 0.707107
-v -3.810250 -1.000000 0.831470
-v -3.810250 1.000000 0.831470
-v -3.983137 -1.000000 0.923880
-v -3.983137 1.000000 0.923880
-v -4.170730 -1.000000 0.980785
-v -4.170730 1.000000 0.980785
-v -4.365820 -1.000000 1.000000
-v -4.365820 1.000000 1.000000
-v -4.560911 -1.000000 0.980785
-v -4.560911 1.000000 0.980785
-v -4.748504 -1.000000 0.923880
-v -4.748504 1.000000 0.923880
-v -4.921391 -1.000000 0.831470
-v -4.921391 1.000000 0.831470
-v -5.072927 -1.000000 0.707107
-v -5.072927 1.000000 0.707107
-v -5.197290 -1.000000 0.555570
-v -5.197290 1.000000 0.555570
-v -5.289700 -1.000000 0.382683
-v -5.289700 1.000000 0.382683
-v -5.346606 -1.000000 0.195090
-v -5.346606 1.000000 0.195090
-v -5.365820 -1.000000 0.000000
-v -5.365820 1.000000 0.000000
-v -5.346606 -1.000000 -0.195090
-v -5.346606 1.000000 -0.195090
-v -5.289700 -1.000000 -0.382683
-v -5.289700 1.000000 -0.382683
-v -5.197290 -1.000000 -0.555570
-v -5.197290 1.000000 -0.555570
-v -5.072927 -1.000000 -0.707107
-v -5.072927 1.000000 -0.707107
-v -4.921391 -1.000000 -0.831470
-v -4.921391 1.000000 -0.831470
-v -4.748504 -1.000000 -0.923880
-v -4.748504 1.000000 -0.923880
-v -4.560911 -1.000000 -0.980785
-v -4.560911 1.000000 -0.980785
-vn 0.0980 -0.0000 -0.9952
-vn 0.2903 -0.0000 -0.9569
-vn 0.4714 -0.0000 -0.8819
-vn 0.6344 -0.0000 -0.7730
-vn 0.7730 -0.0000 -0.6344
-vn 0.8819 -0.0000 -0.4714
-vn 0.9569 -0.0000 -0.2903
-vn 0.9952 -0.0000 -0.0980
-vn 0.9952 -0.0000 0.0980
-vn 0.9569 -0.0000 0.2903
-vn 0.8819 -0.0000 0.4714
-vn 0.7730 -0.0000 0.6344
-vn 0.6344 -0.0000 0.7730
-vn 0.4714 -0.0000 0.8819
-vn 0.2903 -0.0000 0.9569
-vn 0.0980 -0.0000 0.9952
-vn -0.0980 -0.0000 0.9952
-vn -0.2903 -0.0000 0.9569
-vn -0.4714 -0.0000 0.8819
-vn -0.6344 -0.0000 0.7730
-vn -0.7730 -0.0000 0.6344
-vn -0.8819 -0.0000 0.4714
-vn -0.9569 -0.0000 0.2903
-vn -0.9952 -0.0000 0.0980
-vn -0.9952 -0.0000 -0.0980
-vn -0.9569 -0.0000 -0.2903
-vn -0.8819 -0.0000 -0.4714
-vn -0.7730 -0.0000 -0.6344
-vn -0.6344 -0.0000 -0.7730
-vn -0.4714 -0.0000 -0.8819
-vn -0.0000 1.0000 -0.0000
-vn -0.2903 -0.0000 -0.9569
-vn -0.0980 -0.0000 -0.9952
-vn -0.0000 -1.0000 -0.0000
-vt 1.000000 0.500000
-vt 1.000000 1.000000
-vt 0.968750 1.000000
-vt 0.968750 0.500000
-vt 0.937500 1.000000
-vt 0.937500 0.500000
-vt 0.906250 1.000000
-vt 0.906250 0.500000
-vt 0.875000 1.000000
-vt 0.875000 0.500000
-vt 0.843750 1.000000
-vt 0.843750 0.500000
-vt 0.812500 1.000000
-vt 0.812500 0.500000
-vt 0.781250 1.000000
-vt 0.781250 0.500000
-vt 0.750000 1.000000
-vt 0.750000 0.500000
-vt 0.718750 1.000000
-vt 0.718750 0.500000
-vt 0.687500 1.000000
-vt 0.687500 0.500000
-vt 0.656250 1.000000
-vt 0.656250 0.500000
-vt 0.625000 1.000000
-vt 0.625000 0.500000
-vt 0.593750 1.000000
-vt 0.593750 0.500000
-vt 0.562500 1.000000
-vt 0.562500 0.500000
-vt 0.531250 1.000000
-vt 0.531250 0.500000
-vt 0.500000 1.000000
-vt 0.500000 0.500000
-vt 0.468750 1.000000
-vt 0.468750 0.500000
-vt 0.437500 1.000000
-vt 0.437500 0.500000
-vt 0.406250 1.000000
-vt 0.406250 0.500000
-vt 0.375000 1.000000
-vt 0.375000 0.500000
-vt 0.343750 1.000000
-vt 0.343750 0.500000
-vt 0.312500 1.000000
-vt 0.312500 0.500000
-vt 0.281250 1.000000
-vt 0.281250 0.500000
-vt 0.250000 1.000000
-vt 0.250000 0.500000
-vt 0.218750 1.000000
-vt 0.218750 0.500000
-vt 0.187500 1.000000
-vt 0.187500 0.500000
-vt 0.156250 1.000000
-vt 0.156250 0.500000
-vt 0.125000 1.000000
-vt 0.125000 0.500000
-vt 0.093750 1.000000
-vt 0.093750 0.500000
-vt 0.062500 1.000000
-vt 0.062500 0.500000
-vt 0.296822 0.485388
-vt 0.250000 0.490000
-vt 0.203178 0.485388
-vt 0.158156 0.471731
-vt 0.116663 0.449553
-vt 0.080294 0.419706
-vt 0.050447 0.383337
-vt 0.028269 0.341844
-vt 0.014612 0.296822
-vt 0.010000 0.250000
-vt 0.014612 0.203178
-vt 0.028269 0.158156
-vt 0.050447 0.116663
-vt 0.080294 0.080294
-vt 0.116663 0.050447
-vt 0.158156 0.028269
-vt 0.203178 0.014612
-vt 0.250000 0.010000
-vt 0.296822 0.014612
-vt 0.341844 0.028269
-vt 0.383337 0.050447
-vt 0.419706 0.080294
-vt 0.449553 0.116663
-vt 0.471731 0.158156
-vt 0.485388 0.203178
-vt 0.490000 0.250000
-vt 0.485388 0.296822
-vt 0.471731 0.341844
-vt 0.449553 0.383337
-vt 0.419706 0.419706
-vt 0.383337 0.449553
-vt 0.341844 0.471731
-vt 0.031250 1.000000
-vt 0.031250 0.500000
-vt 0.000000 1.000000
-vt 0.000000 0.500000
-vt 0.750000 0.490000
-vt 0.796822 0.485388
-vt 0.841844 0.471731
-vt 0.883337 0.449553
-vt 0.919706 0.419706
-vt 0.949553 0.383337
-vt 0.971731 0.341844
-vt 0.985388 0.296822
-vt 0.990000 0.250000
-vt 0.985388 0.203178
-vt 0.971731 0.158156
-vt 0.949553 0.116663
-vt 0.919706 0.080294
-vt 0.883337 0.050447
-vt 0.841844 0.028269
-vt 0.796822 0.014612
-vt 0.750000 0.010000
-vt 0.703178 0.014612
-vt 0.658156 0.028269
-vt 0.616663 0.050447
-vt 0.580294 0.080294
-vt 0.550447 0.116663
-vt 0.528269 0.158156
-vt 0.514612 0.203178
-vt 0.510000 0.250000
-vt 0.514612 0.296822
-vt 0.528269 0.341844
-vt 0.550447 0.383337
-vt 0.580294 0.419706
-vt 0.616663 0.449553
-vt 0.658156 0.471731
-vt 0.703178 0.485388
-s 0
-f 9/15/7 10/16/7 12/17/7 11/18/7
-f 11/18/8 12/17/8 14/19/8 13/20/8
-f 13/20/9 14/19/9 16/21/9 15/22/9
-f 15/22/10 16/21/10 18/23/10 17/24/10
-f 17/24/11 18/23/11 20/25/11 19/26/11
-f 19/26/12 20/25/12 22/27/12 21/28/12
-f 21/28/13 22/27/13 24/29/13 23/30/13
-f 23/30/14 24/29/14 26/31/14 25/32/14
-f 25/32/15 26/31/15 28/33/15 27/34/15
-f 27/34/16 28/33/16 30/35/16 29/36/16
-f 29/36/17 30/35/17 32/37/17 31/38/17
-f 31/38/18 32/37/18 34/39/18 33/40/18
-f 33/40/19 34/39/19 36/41/19 35/42/19
-f 35/42/20 36/41/20 38/43/20 37/44/20
-f 37/44/21 38/43/21 40/45/21 39/46/21
-f 39/46/22 40/45/22 42/47/22 41/48/22
-f 41/48/23 42/47/23 44/49/23 43/50/23
-f 43/50/24 44/49/24 46/51/24 45/52/24
-f 45/52/25 46/51/25 48/53/25 47/54/25
-f 47/54/26 48/53/26 50/55/26 49/56/26
-f 49/56/27 50/55/27 52/57/27 51/58/27
-f 51/58/28 52/57/28 54/59/28 53/60/28
-f 53/60/29 54/59/29 56/61/29 55/62/29
-f 55/62/30 56/61/30 58/63/30 57/64/30
-f 57/64/31 58/63/31 60/65/31 59/66/31
-f 59/66/32 60/65/32 62/67/32 61/68/32
-f 61/68/33 62/67/33 64/69/33 63/70/33
-f 63/70/34 64/69/34 66/71/34 65/72/34
-f 65/72/35 66/71/35 68/73/35 67/74/35
-f 67/74/36 68/73/36 70/75/36 69/76/36
-f 12/77/37 10/78/37 72/79/37 70/80/37 68/81/37 66/82/37 64/83/37 62/84/37 60/85/37 58/86/37 56/87/37 54/88/37 52/89/37 50/90/37 48/91/37 46/92/37 44/93/37 42/94/37 40/95/37 38/96/37 36/97/37 34/98/37 32/99/37 30/100/37 28/101/37 26/102/37 24/103/37 22/104/37 20/105/37 18/106/37 16/107/37 14/108/37
-f 69/76/38 70/75/38 72/109/38 71/110/38
-f 71/110/39 72/109/39 10/111/39 9/112/39
-f 9/113/40 11/114/40 13/115/40 15/116/40 17/117/40 19/118/40 21/119/40 23/120/40 25/121/40 27/122/40 29/123/40 31/124/40 33/125/40 35/126/40 37/127/40 39/128/40 41/129/40 43/130/40 45/131/40 47/132/40 49/133/40 51/134/40 53/135/40 55/136/40 57/137/40 59/138/40 61/139/40 63/140/40 65/141/40 67/142/40 69/143/40 71/144/40

build.zig

@@ -150,6 +150,9 @@ const asset_extensions = [_][]const u8{
     "png",
     "jpg",
     "exr",
+    "fbx",
+    "gltf",
+    "glb",
 };
 
 // Find all assets and cook them using assetc
@@ -208,13 +211,11 @@ fn buildAssetCompiler(b: *Build, optimize: std.builtin.OptimizeMode, assets_mod:
         .target = b.host,
         .optimize = optimize,
         //.formats = @as([]const u8, "3DS,3MF,AC,AMF,ASE,Assbin,Assjson,Assxml,B3D,Blender,BVH,C4D,COB,Collada,CSM,DXF,FBX,glTF,glTF2,HMP,IFC,Irr,LWO,LWS,M3D,MD2,MD3,MD5,MDC,MDL,MMD,MS3D,NDO,NFF,Obj,OFF,Ogre,OpenGEX,Ply,Q3BSP,Q3D,Raw,SIB,SMD,Step,STEPParser,STL,Terragen,Unreal,X,X3D,XGL"),
-        .formats = @as([]const u8, "Obj"),
+        .formats = @as([]const u8, "Obj,FBX,glTF,glTF2,Blend"),
     });
     const zalgebra_dep = b.dependency("zalgebra", .{});
 
     const assimp_lib = assimp_dep.artifact("assimp");
-    // HACK: fix in assimp
-    assimp_lib.defineCMacro("AI_CONFIG_FBX_USE_SKELETON_BONE_CONTAINER", "\"AI_CONFIG_FBX_USE_SKELETON_BONE_CONTAINER\"");
 
     const assetc = b.addExecutable(.{
         .name = "assetc",

build.zig.zon

@@ -20,8 +20,8 @@
             .hash = "1220483cbb42231cb056f4ea6669894c68ccd560d3af5832d6e9c84c61844bc20b7d",
         },
         .@"zig-assimp" = .{
-            .url = "https://github.com/sergeypdev/zig-assimp/tarball/64b31e9c01132352246955f496642332cb611577",
+            .url = "https://github.com/sergeypdev/zig-assimp/tarball/59c2f0202bf1e5110f3eb219669f3762e3db2768",
-            .hash = "1220a57ac5fe4f45eae98d9b26f7cba93dca90782d631ef73a740b0190559d424054",
+            .hash = "122015247b178258ee2fd9f7fbd3f8025138e8e38b5cbecdc94262974da49bd1c225",
         },
         .zalgebra = .{
             .url = "git+https://github.com/sergeypdev/zalgebra.git#232ff76712dc7cc270b6c48cedc84617536f3a59",

src/game.zig

@@ -269,9 +269,7 @@ export fn game_init(global_allocator: *std.mem.Allocator) void {
         }
     }
 
-    const test_scene_root = globals.g_mem.world.createScene(globals.g_assetman.resolveScene(a.Scenes.test_scene.scene));
+    // const test_scene_root = globals.g_mem.world.createScene(globals.g_assetman.resolveScene(a.Scenes.test_scene.scene));
-
-    std.log.debug("test scene root idx {}\n", .{test_scene_root.idx});
 }
 
 export fn game_update() bool {

tools/GenerateAssetManifest.zig

@@ -55,7 +55,7 @@ fn make(step: *Step, prog_node: *std.Progress.Node) !void {
     // Random bytes to make WriteFile unique. Refresh this with
     // new random bytes when GenerateAssetManifest implementation is modified
     // in a non-backwards-compatible way.
-    man.hash.add(@as(u32, 0xd767ee71));
+    man.hash.add(@as(u32, 0xd767ee75));
 
     // TODO: sort generated asset lists to make sure cache is predictable
 
@@ -153,7 +153,7 @@ fn writeAssetManifest(arena: std.mem.Allocator, writer: anytype, assets: []Asset
     // TODO: think about building a perfect hashmap
     // AssetId -> Asset path mapping
     try writer.writeAll(
-        \\var buf: [4096]u8 = undefined;
+        \\var buf: [1024 * 1024]u8 = undefined;
         \\var fba = std.heap.FixedBufferAllocator.init(&buf);
         \\pub var asset_paths = std.AutoHashMapUnmanaged(u64, []const u8){};
         \\var initialized = false;
@@ -166,6 +166,7 @@ fn writeAssetManifest(arena: std.mem.Allocator, writer: anytype, assets: []Asset
     );
     for (assets) |asset_list_entry| {
         const path = try asset_list_entry.getOutputPath(&buf);
+        std.log.debug("asset output path: {s}\n", .{path});
         try std.fmt.format(writer, "    asset_paths.put(fba.allocator(), {}, \"{}\") catch @panic(\"OOM\");\n", .{ asset_list_entry.getAssetId(), std.zig.fmtEscapes(path) });
     }
     try writer.writeAll("}\n\n");
@@ -191,7 +192,6 @@ const NestedAssetDef = union(enum) {
         path: types.AssetPath,
         asset_list_entry: AssetListEntry,
     ) !void {
-        std.log.debug("NestedAssetDef.put {s}", .{path.getPath()});
         var iter = try std.fs.path.componentIterator(path.getPath());
         const filename = iter.last().?.name;
         _ = iter.first();
@@ -199,10 +199,8 @@ const NestedAssetDef = union(enum) {
         var current = &self.path;
 
         while (iter.next()) |comp| {
-            std.log.debug("NestedAssetDef comp next {s}\n", .{comp.name});
             if (comp.name.ptr == filename.ptr) break;
             const gop = try current.getOrPut(allocator, comp.name);
-            std.log.debug("NestedAssetDef put path {s}\n", .{comp.name});
             if (!gop.found_existing) {
                 gop.value_ptr.* = NestedAssetDef{ .path = .{} };
             }
@@ -216,7 +214,6 @@ const NestedAssetDef = union(enum) {
             }
             try gop.value_ptr.put(allocator, .{ .simple = sub_path }, asset_list_entry);
         } else {
-            std.log.debug("NestedAssetDef put filename {s}\n", .{std.fs.path.stem(filename)});
             try current.put(allocator, std.fs.path.stem(filename), NestedAssetDef{
                 .asset = asset_list_entry,
             });

tools/asset_compiler.zig

@@ -9,6 +9,7 @@ const Vector2 = formats.Vector2;
 const Vector3 = formats.Vector3;
 const za = @import("zalgebra");
 const Vec3 = za.Vec3;
+const Mat4 = za.Mat4;
 const c = @cImport({
     @cInclude("assimp/cimport.h");
     @cInclude("assimp/scene.h");
@@ -23,9 +24,18 @@ const c = @cImport({
 
 const ASSET_MAX_BYTES = 1024 * 1024 * 1024;
 
+const scene_formats = [_][]const u8{
+    ".obj",
+    ".fbx",
+    ".gltf",
+    ".glb",
+};
+
 pub fn resolveAssetTypeByExtension(path: []const u8) ?AssetType {
-    if (std.mem.endsWith(u8, path, ".obj") or std.mem.endsWith(u8, path, ".fbx")) {
+    for (scene_formats) |ext| {
-        return .Scene;
+        if (std.mem.endsWith(u8, path, ext)) {
+            return .Scene;
+        }
     }
     if (std.mem.endsWith(u8, path, ".prog")) {
         return .ShaderProgram;
@@ -68,7 +78,7 @@ pub fn main() !void {
     var buf_asset_list_writer = std.io.bufferedWriter(std.io.getStdOut().writer());
     const asset_list_writer = buf_asset_list_writer.writer();
 
-    std.log.debug("rel_input: {s}", .{rel_input});
+    std.log.debug("type: {s}, rel_input: {s}", .{ @tagName(asset_type), rel_input });
 
     switch (asset_type) {
         .Scene => try processScene(allocator, rel_input, output_dir, asset_list_writer),
@@ -129,6 +139,12 @@ fn createOutput(_type: AssetType, asset_path: AssetPath, output_dir: std.fs.Dir,
 /// It all depends on the source asset.
 fn processScene(allocator: std.mem.Allocator, input: []const u8, output_dir: std.fs.Dir, asset_list_writer: anytype) !void {
     const input_z = try std.mem.concatWithSentinel(allocator, u8, &.{input}, 0);
+    const config: *c.aiPropertyStore = @as(?*c.aiPropertyStore, @ptrCast(c.aiCreatePropertyStore())) orelse return error.PropertyStore;
+    defer c.aiReleasePropertyStore(config);
+
+    // Remove point and line meshes
+    c.aiSetImportPropertyInteger(config, c.AI_CONFIG_PP_SBP_REMOVE, c.aiPrimitiveType_POINT | c.aiPrimitiveType_LINE);
+
     const maybe_scene: ?*const c.aiScene = @ptrCast(c.aiImportFile(
         input_z.ptr,
         c.aiProcess_CalcTangentSpace | c.aiProcess_Triangulate | c.aiProcess_JoinIdenticalVertices | c.aiProcess_SortByPType | c.aiProcess_GenNormals,
@@ -158,8 +174,9 @@ fn processScene(allocator: std.mem.Allocator, input: []const u8, output_dir: std
 
         for (meshes) |mesh| {
             const name = mesh.mName.data[0..mesh.mName.length];
+            std.log.debug("mesh name {s}\n", .{name});
 
-            var output = try createOutput(.Mesh, base_asset_path.subPath(name), output_dir, asset_list_writer);
+            var output = try createOutput(.Mesh, base_asset_path.subPath(try allocator.dupe(u8, name)), output_dir, asset_list_writer);
             defer output.file.close();
 
             try mesh_outputs.append(output.list_entry);
@@ -201,21 +218,35 @@ fn processScene(allocator: std.mem.Allocator, input: []const u8, output_dir: std
 
             const ent = &entities.items[idx];
 
-            // TODO: extract transform
+            var mat = Mat4.fromSlice(@ptrCast(&node.mTransformation));
+            mat = mat.transpose();
+            const mat_decomp = mat.decompose();
+            ent.transform.pos = mat_decomp.t;
+            ent.transform.rot = mat_decomp.r;
+            ent.transform.scale = mat_decomp.s;
 
             if (node.mMeshes != null) {
                 const mesh_indices = node.mMeshes[0..node.mNumMeshes];
-                for (mesh_indices) |mesh_idx| {
+                if (mesh_indices.len == 1) {
-                    const mesh_entry = mesh_outputs.items[@intCast(mesh_idx)];
+                    const mesh_entry = mesh_outputs.items[mesh_indices[0]];
-                    ent.flags.mesh = true;
-                    ent.flags.rotate = true;
 
-                    // TODO: turn multiple meshes into sub-entities
+                    ent.flags.mesh = true;
-                    ent.mesh = .{
+                    ent.mesh.handle = .{ .id = mesh_entry.src_path.hash() };
-                        .handle = .{ .id = mesh_entry.src_path.hash() },
+                } else {
-                        // TODO: extract material
+                    for (mesh_indices) |mesh_idx| {
-                    };
+                        const mesh_entry = mesh_outputs.items[@intCast(mesh_idx)];
-                    ent.rotate = .{ .axis = Vec3.up(), .rate = 80 };
+
+                        try entities.append(.{});
+                        const sub_idx = entities.items.len - 1;
+                        try parents.append(@intCast(idx));
+                        const sub_ent = &entities.items[sub_idx];
+
+                        sub_ent.flags.mesh = true;
+
+                        sub_ent.mesh = .{
+                            .handle = .{ .id = mesh_entry.src_path.hash() },
+                        };
+                    }
                 }
             }
         }
@@ -273,7 +304,7 @@ fn processMesh(allocator: std.mem.Allocator, scene: *const c.aiScene, mesh: *con
     }
 
     for (0..mesh.mNumFaces) |i| {
-        std.debug.assert(mesh.mFaces[i].mNumIndices == 3);
+        if (mesh.mFaces[i].mNumIndices != 3) continue;
         for (0..3) |j| {
             const index = mesh.mFaces[i].mIndices[j];
             if (index > std.math.maxInt(formats.Index)) {

tools/asset_list.zig

@@ -16,6 +16,7 @@ pub const AssetListEntry = struct {
     // TODO: might be a better way to do this
     pub fn getOutputPath(self: *const AssetListEntry, out_buf: []u8) ![]u8 {
         const path_len = self.src_path.strLen();
+        if (path_len == 0) return error.InvalidSrcPath;
         const len = path_len + self.type.ext().len + 1;
         if (out_buf.len < len) {
             return error.BufferTooSmall;
@@ -24,8 +25,13 @@ pub const AssetListEntry = struct {
         _ = try self.src_path.toStringSep(out_buf, std.fs.path.sep);
 
         var end = path_len;
-        const ext_len = std.fs.path.extension(out_buf[0..path_len]).len;
+        switch (self.src_path) {
-        end -= ext_len;
+            .simple => {
+                const ext_len = std.fs.path.extension(out_buf[0..path_len]).len;
+                end -= ext_len;
+            },
+            else => {},
+        }
 
         // Extension
         out_buf[end] = '.';
@@ -38,17 +44,18 @@ pub const AssetListEntry = struct {
 
 pub fn writeAssetListEntryText(writer: anytype, entry: AssetListEntry) !void {
     try writer.writeAll(@tagName(entry.type));
-    try writer.writeByte(' ');
+    try writer.writeByte(0);
     try entry.src_path.writeString(writer);
+    try writer.writeByte(0);
     try writer.writeByte('\n');
 }
 
 pub fn readAssetListEntryText(alloc: std.mem.Allocator, reader: anytype) !AssetListEntry {
     var buf: [std.fs.MAX_PATH_BYTES * 2 + 1]u8 = undefined;
 
-    const asset_type_str = try alloc.dupe(u8, try reader.readUntilDelimiterOrEof(&buf, ' ') orelse return error.MissingAssetType);
+    const asset_type_str = try alloc.dupe(u8, try reader.readUntilDelimiterOrEof(&buf, 0) orelse return error.MissingAssetType);
     const asset_type = std.meta.stringToEnum(AssetType, asset_type_str) orelse return error.InvalidAssetType;
-    const src_path_str = try alloc.dupe(u8, try reader.readUntilDelimiterOrEof(&buf, ' ') orelse return error.MissingSrcPath);
+    const src_path_str = try alloc.dupe(u8, try reader.readUntilDelimiterOrEof(&buf, 0) orelse return error.MissingSrcPath);
     const src_path = AssetPath.fromString(src_path_str);
 
     return AssetListEntry{

tools/types.zig

@@ -29,6 +29,7 @@ pub const AssetType = enum {
 };
 
 pub const AssetPath = union(enum) {
+    invalid: void, // translates to handle with id: 0
     simple: []const u8,
     nested: struct {
         path: []const u8,
@@ -36,6 +37,10 @@ pub const AssetPath = union(enum) {
     },
 
     pub fn hash(self: AssetPath) u64 {
+        switch (self) {
+            .invalid => return 0,
+            else => {},
+        }
         var hasher = std.hash.Wyhash.init(0);
         std.hash.autoHashStrat(&hasher, self.getPath(), .Deep);
         std.hash.autoHashStrat(&hasher, self.getSubPath(), .Deep);
@@ -44,6 +49,7 @@ pub const AssetPath = union(enum) {
 
     pub fn subPath(self: AssetPath, sub_path: []const u8) AssetPath {
         return switch (self) {
+            .invalid => self,
             .simple => |path| AssetPath{ .nested = .{ .path = path, .sub_path = sub_path } },
             .nested => |nested| AssetPath{ .nested = .{ .path = nested.path, .sub_path = sub_path } },
         };
@@ -51,6 +57,7 @@ pub const AssetPath = union(enum) {
 
     pub fn getPath(self: AssetPath) []const u8 {
         return switch (self) {
+            .invalid => "",
             .simple => |path| path,
             .nested => |nested| nested.path,
         };
@@ -58,6 +65,7 @@ pub const AssetPath = union(enum) {
 
     pub fn getSubPath(self: AssetPath) ?[]const u8 {
         return switch (self) {
+            .invalid => null,
             .nested => |nested| nested.sub_path,
             else => null,
         };
@@ -65,6 +73,7 @@ pub const AssetPath = union(enum) {
 
     pub inline fn strLen(self: AssetPath) usize {
         return switch (self) {
+            .invalid => 0,
             .simple => |path| path.len,
             .nested => |nested| return nested.path.len + nested.sub_path.len + 1,
         };
@@ -72,6 +81,7 @@ pub const AssetPath = union(enum) {
 
     pub fn writeString(self: AssetPath, writer: anytype) !void {
         switch (self) {
+            .invalid => {},
             .simple => |path| {
                 try writer.writeAll(path);
             },
@@ -93,6 +103,9 @@ pub const AssetPath = union(enum) {
         }
 
         switch (self) {
+            .invalid => {
+                return out_buf[0..0];
+            },
             .simple => |path| {
                 @memcpy(out_buf[0..path.len], path);
                 return out_buf[0..path.len];
@@ -113,7 +126,10 @@ pub const AssetPath = union(enum) {
     }
 
     pub fn fromString(str: []const u8) AssetPath {
-        if (std.mem.lastIndexOf(u8, str, "#")) |sep_idx| {
+        if (str.len == 0) {
+            return .invalid;
+        }
+        if (std.mem.indexOf(u8, str, "#")) |sep_idx| {
             return .{
                 .nested = .{
                     .path = str[0..sep_idx],