fix(web): correct transform rotation and lay-flat sign

Conjugate the rotation by the Z-reflection (negate rotX/rotY, keep rotZ) and use -90 degrees about X to lay extruded meshes flat so faces point up.

apps/web/src/components/viewers/Scene.tsx

@@ -1,6 +1,6 @@
 import { Suspense, type ReactNode } from 'react';
 import { Canvas } from '@react-three/fiber';
-import { Bounds, ContactShadows, OrbitControls } from '@react-three/drei';
+import { Bounds, ContactShadows, OrbitControls, useProgress } from '@react-three/drei';
 import { Bloom, EffectComposer, Vignette } from '@react-three/postprocessing';
 
 /**
@@ -15,7 +15,8 @@ import { Bloom, EffectComposer, Vignette } from '@react-three/postprocessing';
  */
 export default function Scene({ children }: { children: ReactNode }) {
   return (
-    <div className="h-80 w-full overflow-hidden rounded-lg bg-linear-to-b from-zinc-900 to-zinc-950">
+    <div className="relative h-80 w-full overflow-hidden rounded-lg bg-linear-to-b from-zinc-900 to-zinc-950">
+      <LoadingOverlay />
       <Canvas
         camera={{ position: [2.2, 1.8, 2.6], fov: 40 }}
         dpr={[1, 2]}
@@ -54,3 +55,24 @@ export default function Scene({ children }: { children: ReactNode }) {
     </div>
   );
 }
+
+/**
+ * A loading overlay shown while assets (textures, models, traces) are being
+ * fetched. Reads drei's global progress store, which tracks every loader in
+ * the scene, so it works outside the Canvas. Hidden once loading completes.
+ */
+function LoadingOverlay() {
+  const { active, progress, item, loaded, total } = useProgress();
+  if (!active) return null;
+  return (
+    <div className="absolute inset-0 z-10 flex flex-col items-center justify-center gap-2 bg-zinc-950/70 text-sm text-zinc-300">
+      <div className="flex items-center gap-2">
+        <span className="h-4 w-4 animate-spin rounded-full border-2 border-zinc-600 border-t-zinc-200" />
+        <span>Loading assets… {Math.round(progress)}%</span>
+      </div>
+      <span className="max-w-80 truncate text-xs text-zinc-500">
+        {loaded}/{total} {item}
+      </span>
+    </div>
+  );
+}

apps/web/src/components/viewers/transform.ts

@@ -0,0 +1,89 @@
+import type { TTSObject } from '@tts/shared';
+
+/**
+ * Convert a TTS object's `Transform` (position/rotation/scale in TTS world
+ * units) into three.js props so the full-setup view can place objects at their
+ * real table positions.
+ *
+ * TTS is left-handed with Y up and +Z toward the player; three.js is
+ * right-handed with Y up. Converting by reflecting the Z axis (negating Z in
+ * position) maps a TTS placement onto the three.js scene while preserving the
+ * physical layout. The rotation is conjugated by the reflection: `R_three =
+ * M·R_tts·M` with `M = diag(1,1,-1)`, which negates `rotX`/`rotY` but leaves
+ * `rotZ` unchanged.
+ *
+ * Our viewer meshes are authored for inspection (standing up, extruded along
+ * Z, sized in arbitrary units), so each class also gets a base-size correction
+ * and a "lay flat" rotation to match TTS world units and orientation.
+ */
+
+/** Degrees → radians. */
+const rad = (d: number) => (d * Math.PI) / 180;
+
+/**
+ * Base-size correction: our viewer mesh size → TTS world units at scale 1.
+ * `scale` in the transform is multiplied by this so objects end up the right
+ * relative size on the table.
+ */
+const CORRECTION: Record<string, number> = {
+  // Card long axis is 2 units in the viewer; 1.0 in TTS.
+  Card: 0.5,
+  CardCustom: 0.5,
+  Deck: 0.5,
+  DeckCustom: 0.5,
+  Custom_Deck: 0.5,
+  // Tile is 2 units in the viewer; 1.0 in TTS.
+  Tile: 0.5,
+  Custom_Tile: 0.5,
+  // Token is 1.8 units in the viewer; 0.7 in TTS.
+  Custom_Token: 0.7 / 1.8,
+  // Custom models are loaded at 0.5 scale in the viewer; 1.0 in TTS.
+  Custom_Model: 2,
+  Custom_Model_Bag: 2,
+  Custom_Model_Infinite_Bag: 2,
+};
+
+/**
+ * Rotation that lays an extruded mesh flat. The tile/token/card meshes extrude
+ * along +Z with their face in the XY plane (standing up); rotating −90° about
+ * X maps the +Z face normal to +Y, so the face points up like an object lying
+ * on a TTS table. Custom models are authored standing up already, so they need
+ * no correction.
+ */
+const LAY_FLAT: [number, number, number] = [-Math.PI / 2, 0, 0];
+
+const FLAT_CLASSES = new Set([
+  'Card',
+  'CardCustom',
+  'Deck',
+  'DeckCustom',
+  'Custom_Deck',
+  'Tile',
+  'Custom_Tile',
+  'Custom_Token',
+]);
+
+export interface ObjectPlacement {
+  position: [number, number, number];
+  rotation: [number, number, number];
+  scale: [number, number, number];
+  /** Rotation applied to the mesh before the TTS rotation (lay flat). */
+  layFlat: [number, number, number];
+}
+
+/**
+ * Derive the three.js placement for an object from its `Transform`. Returns
+ * null when the object has no transform (shouldn't happen in a real save).
+ */
+export function objectPlacement(object: TTSObject): ObjectPlacement | null {
+  const t = object.Transform;
+  if (!t) return null;
+  const corr = CORRECTION[object.Name] ?? 1;
+  return {
+    position: [t.posX, t.posY, -t.posZ],
+    // Reflection conjugates the rotation: Rx/Ry negate, Rz keeps its sign.
+    rotation: [-rad(t.rotX), -rad(t.rotY), rad(t.rotZ)],
+    scale: [t.scaleX * corr, t.scaleY * corr, t.scaleZ * corr],
+    layFlat: FLAT_CLASSES.has(object.Name) ? LAY_FLAT : [0, 0, 0],
+  };
+}

apps/web/src/pages/FullSetupPage.tsx

@@ -9,6 +9,7 @@ import { TileObjectMesh } from '../components/viewers/TileViewer';
 import { TokenObjectMesh } from '../components/viewers/TokenViewer';
 import { CardObjectMesh } from '../components/viewers/CardViewer';
 import { CustomModelMesh } from '../components/viewers/CustomModelViewer';
+import { objectPlacement } from '../components/viewers/transform';
 
 /** Object classes that carry renderable assets (mirrors `viewers/register.ts`). */
 const RENDERABLE = new Set([
@@ -25,15 +26,11 @@ const RENDERABLE = new Set([
   'Custom_Model_Infinite_Bag',
 ]);
 
-/** Grid cell spacing (world units) and columns per row. */
-const CELL = 2.5;
-const COLS = 8;
-
 /**
  * A "full setup" view: renders every loadable object in a save into a single
- * shared scene, laid out on a virtual table. Objects are grouped by type so
- * like objects sit together. Geometry and materials are shared across objects
- * (see `components/viewers/sharedResources.ts`).
+ * shared scene, placed at its real position from the save's `Transform`.
+ * Geometry and materials are shared across objects (see
+ * `components/viewers/sharedResources.ts`).
  */
 export default function FullSetupPage() {
   const { id } = useParams<{ id: string }>();
@@ -55,7 +52,16 @@ export default function FullSetupPage() {
   );
   const skipped = objects.length - renderable.length;
 
-  const placed = useMemo(() => layoutObjects(renderable), [renderable]);
+  const placed = useMemo(
+    () =>
+      renderable
+        .map((object) => ({ object, placement: objectPlacement(object) }))
+        .filter(
+          (p): p is { object: TTSObject; placement: NonNullable<ReturnType<typeof objectPlacement>> } =>
+            p.placement !== null,
+        ),
+    [renderable],
+  );
 
   if (loading) return <p className="text-sm text-zinc-400">Loading mod…</p>;
   if (error) return <p className="text-sm text-red-400">{error}</p>;
@@ -74,10 +80,17 @@ export default function FullSetupPage() {
       <Scene>
         <Suspense fallback={null}>
           {/* Key by index, not GUID: cards in a deck share the deck's GUID. */}
-          {placed.map(({ object, position }, index) => (
-            <group key={index} position={position}>
+          {placed.map(({ object, placement }, index) => (
+            <group
+              key={index}
+              position={placement.position}
+              rotation={placement.rotation}
+              scale={placement.scale}
+            >
+              <group rotation={placement.layFlat}>
                 <RenderObject object={object} />
               </group>
+            </group>
           ))}
         </Suspense>
       </Scene>
@@ -107,39 +120,3 @@ function RenderObject({ object }: { object: TTSObject }) {
       return null;
   }
 }
-
-/**
- * Assign each renderable object a grid position, grouping by class so like
- * objects sit together. Returns the object plus its `[x, y, z]` position.
- */
-function layoutObjects(
-  objects: TTSObject[],
-): { object: TTSObject; position: [number, number, number] }[] {
-  // Group by type so like objects sit together.
-  const groups = new Map<string, TTSObject[]>();
-  for (const o of objects) {
-    const arr = groups.get(o.Name) ?? [];
-    arr.push(o);
-    groups.set(o.Name, arr);
-  }
-
-  const result: { object: TTSObject; position: [number, number, number] }[] = [];
-  let row = 0;
-  let col = 0;
-  for (const objs of groups.values()) {
-    for (const o of objs) {
-      result.push({ object: o, position: [col * CELL, 0, row * CELL] });
-      col++;
-      if (col >= COLS) {
-        col = 0;
-        row++;
-      }
-    }
-    // Start a fresh row after each group.
-    if (col !== 0) {
-      col = 0;
-      row++;
-    }
-  }
-  return result;
-}

docs/full-setup-view.md

@@ -23,8 +23,9 @@ user can see the entire scene at a glance.
 - `@tts/extract` provides `flattenObjects(mod)` / `traverseMod` to enumerate
   every object in a save.
 - `@tts/mesh` provides the shape + extrusion helpers used by the viewers.
-- `TTSObject` carries no position data, so exact table placement is not
-  recoverable — the full setup lays objects out itself.
+- Every object in a save carries a `Transform` (position/rotation/scale in TTS
+  world units), which the proxy passes through in the raw BSON. The shared
+  type now models it as `TTSObjectTransform`.
 
 ## Plan
 
@@ -56,10 +57,15 @@ view and the full-setup view.
 
 ### 3. Layout
 
-- Arrange objects in a grid on the "table" (fixed spacing, wrapping by row),
-  grouping by type so cards sit together, tiles together, etc.
-- `Scene`'s `Bounds fit` already auto-fits the camera to the full layout, so no
-  camera work is needed.
+- Place each object at its real position from the save's `Transform` instead of
+  a generated grid.
+- `components/viewers/transform.ts` converts a TTS transform to three.js:
+  TTS is left-handed (Y up, +Z toward the player), three.js is right-handed,
+  so Z is reflected in position and rotation. Each class also gets a base-size
+  correction (our viewer meshes are authored for inspection, in arbitrary
+  units) and a "lay flat" rotation for the extruded tile/token/card meshes.
+- `Scene`'s `Bounds fit` auto-fits the camera to the full layout, so no camera
+  work is needed.
 - Non-renderable objects (bags, dice, boards without assets) are skipped and
   counted, not dropped silently.
 
@@ -102,6 +108,9 @@ view and the full-setup view.
   export object-facing mesh wrappers
 - `apps/web/src/components/viewers/sharedResources.ts` — new geometry/material
   caches
+- `apps/web/src/components/viewers/transform.ts` — new TTS→three.js placement
+  conversion
+- `packages/shared/src/types.ts` — add `TTSObjectTransform`
 - `apps/web/src/pages/FullSetupPage.tsx` — new
 - `apps/web/src/App.tsx` — route
 - `apps/web/src/pages/ModPage.tsx` — nav link
@@ -110,6 +119,7 @@ view and the full-setup view.
 
 ## Open decisions (defaults in bold)
 
-- **Layout style** — **grouped grid** vs a fan/stack for cards.
+- **Layout style** — **real `Transform` placement** (was a grouped grid before
+  the transform data was wired in).
 - **Geometry/material cache lifetime** — **session-level module cache**
   (simplest, consistent with drei's global texture cache) vs dispose-on-unmount.

packages/shared/src/types.ts

@@ -1,3 +1,20 @@
+/**
+ * An object's placement in the TTS world: position, rotation (degrees), and
+ * scale. TTS uses a left-handed system with Y up; `posZ` points toward the
+ * player. Present on every object in a save.
+ */
+export interface TTSObjectTransform {
+  posX: number;
+  posY: number;
+  posZ: number;
+  rotX: number;
+  rotY: number;
+  rotZ: number;
+  scaleX: number;
+  scaleY: number;
+  scaleZ: number;
+}
+
 /**
  * A single object inside a Tabletop Simulator save file.
  * Mirrors the structure produced by BSON-deserializing a TTS save.
@@ -11,6 +28,8 @@ export interface TTSObject {
   Description: string;
   /** Set by `markParent` during traversal; not present in the raw save. */
   Parent?: TTSObject;
+  /** Placement in the TTS world (position, rotation, scale). */
+  Transform?: TTSObjectTransform;
 
   CustomPDF?: {
     PDFUrl: string;