feat(web): lighten tabletop scene and tune contact shadows

Replace the dark surface plane with a grey background and a spotlight,
size the contact shadow to the table, and scale its blur and fade with
the shadow plane. Disable depth test on the stacking curve overlay.

apps/web/src/components/tabletop/TabletopScene.tsx

@@ -8,6 +8,7 @@ import {
   resolveMountTree,
   serializedToPackage,
   useTabletopStore,
+  MM_TO_WORLD,
 } from '@tts/tabletop';
 import Scene from '../viewers/Scene';
 
@@ -35,11 +36,26 @@ export default function TabletopScene({
     [packageData, surfaces],
   );
 
+  // Size the contact shadow to cover 2x the largest enabled surface, so the
+  // shadow plane always extends past the table. Surface sizes are in mm;
+  // `MM_TO_WORLD` converts to world units.
+  const shadowScale = useMemo(() => {
+    let maxMm = 0;
+    for (const [id, enabled] of Object.entries(surfaces)) {
+      if (!enabled) continue;
+      const surface = packageData.surfaces.get(id);
+      if (!surface?.size) continue;
+      maxMm = Math.max(maxMm, ...surface.size);
+    }
+    return maxMm > 0 ? maxMm * 2 * MM_TO_WORLD : 22;
+  }, [packageData, surfaces]);
+
   return (
     <Scene
       autoRotate={false}
       enablePan
       fullscreen
+      shadowScale={shadowScale}
       overlay={
         <button
           onClick={() => setShowSurface((v) => !v)}

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

@@ -2,7 +2,7 @@ import { Suspense, useEffect, useRef, useState, type ReactNode } from 'react';
 import { Icon } from '@iconify/react';
 import { Canvas } from '@react-three/fiber';
 import { Bounds, ContactShadows, OrbitControls, useProgress } from '@react-three/drei';
-import { Bloom, EffectComposer, Vignette } from '@react-three/postprocessing';
+import { EffectComposer, Vignette } from '@react-three/postprocessing';
 
 /**
  * Shared 3D scene wrapper for object viewers. Provides a consistent camera,
@@ -24,6 +24,7 @@ export default function Scene({
   enablePan = false,
   fullscreen = false,
   overlay,
+  shadowScale = 22,
 }: {
   children: ReactNode;
   autoRotate?: boolean;
@@ -31,6 +32,8 @@ export default function Scene({
   fullscreen?: boolean;
   /** HTML rendered inside the scene container (e.g. controls), shown in fullscreen. */
   overlay?: ReactNode;
+  /** Contact shadow plane size in world units; defaults to a generous 22. */
+  shadowScale?: number;
 }) {
   const containerRef = useRef<HTMLDivElement>(null);
   const [isFullscreen, setIsFullscreen] = useState(false);
@@ -49,7 +52,7 @@ export default function Scene({
   return (
     <div
       ref={containerRef}
-      className="relative h-80 w-full overflow-hidden rounded-lg bg-linear-to-b from-zinc-900 to-zinc-950"
+      className="relative h-80 w-full overflow-hidden rounded-lg bg-linear-to-b from-zinc-300 to-zinc-400"
     >
       <LoadingOverlay />
       {fullscreen && (
@@ -66,7 +69,7 @@ export default function Scene({
       <Canvas
         camera={{ position: [2.2, 1.8, 2.6], fov: 40 }}
         dpr={[1, 2]}
-        gl={{ antialias: true }}
+        gl={{ antialias: true, alpha: true }}
       >
         <ambientLight intensity={0.5} />
         <directionalLight position={[4, 6, 3]} intensity={1.4} />
@@ -78,12 +81,13 @@ export default function Scene({
         </Suspense>
 
         <ContactShadows
-          position={[0, -0.5, 0]}
-          opacity={0.55}
-          scale={8}
-          blur={2.4}
-          far={3}
-          resolution={256}
+          position={[0, -0.01, 0]}
+          opacity={0.2}
+          scale={shadowScale}
+          blur={shadowScale * 0.005}
+          far={shadowScale * 0.01}
+          resolution={1024}
+          color="#000000"
         />
         <OrbitControls
           enablePan={enablePan}
@@ -94,7 +98,6 @@ export default function Scene({
         />
 
         <EffectComposer>
-          <Bloom intensity={0.25} luminanceThreshold={0.85} mipmapBlur />
           <Vignette eskil={false} offset={0.25} darkness={0.6} />
         </EffectComposer>
       </Canvas>

packages/tabletop/src/index.ts

@@ -8,6 +8,7 @@ export {
   fallbackShape,
   traceToShape,
   traceToUvBounds,
+  MM_TO_WORLD,
 } from './part.js';
 export { resolveAssetUrl, assetUrl, traceImage } from './http.js';
 
@@ -34,7 +35,6 @@ export type { MountNode, MountTree } from './mount.js';
 export { WorldSurfaceView, SurfaceNode } from './surfaces/WorldSurfaceView.js';
 export { HudSurfaceView } from './surfaces/HudSurfaceView.js';
 export { SurfaceBounds } from './surfaces/SurfaceBounds.js';
-export { SurfacePlane } from './surfaces/SurfacePlane.js';
 
 // Part placement.
 export { PartPlacement } from './placement.js';

packages/tabletop/src/surfaces/StackingCurve.tsx

@@ -29,11 +29,11 @@ export function StackingCurve({ route }: { route: Route }) {
 
   return (
     <group>
-      <Line points={points} color="#f59e0b" lineWidth={2} />
+      <Line points={points} color="#f59e0b" lineWidth={2} depthTest={false} />
       {/* Marker at the curve's start, showing its direction. */}
       <mesh position={[start[0], 0.01, start[2]]}>
         <sphereGeometry args={[0.01, 8, 8]} />
-        <meshBasicMaterial color="#f59e0b" />
+        <meshBasicMaterial color="#f59e0b" depthTest={false} />
       </mesh>
     </group>
   );

packages/tabletop/src/surfaces/SurfacePlane.tsx

@@ -1,24 +0,0 @@
-/**
- * `SurfacePlane` — a visible table surface.
- *
- * A flat rectangle at the surface's reference `size` (mm, converted to world
- * units), centered on the mount anchor. Gives the parts a scale reference and
- * reads as the table the game is played on. Rendered only when `showSurface`
- * is enabled.
- */
-import type { Surface } from '@tts/bgm';
-import { MM_TO_WORLD } from '../part.js';
-
-export function SurfacePlane({ surface }: { surface: Surface }) {
-  if (!surface.size) return null;
-  const [w, h] = surface.size;
-  const width = w * MM_TO_WORLD;
-  const height = h * MM_TO_WORLD;
-
-  return (
-    <mesh rotation={[-Math.PI / 2, 0, 0]} receiveShadow>
-      <planeGeometry args={[width, height]} />
-      <meshStandardMaterial color="#1c1f26" roughness={0.9} metalness={0} />
-    </mesh>
-  );
-}

packages/tabletop/src/surfaces/WorldSurfaceView.tsx

@@ -12,7 +12,6 @@ import { PartPlacement } from '../placement.js';
 import type { MountNode } from '../mount.js';
 import { MM_TO_WORLD, DEG_TO_RAD } from '../part.js';
 import { SurfaceBounds } from './SurfaceBounds.js';
-import { SurfacePlane } from './SurfacePlane.js';
 import { StackingCurve } from './StackingCurve.js';
 
 export function WorldSurfaceView({
@@ -47,7 +46,6 @@ export function SurfaceNode({
     >
       {showSurface && (
         <>
-          <SurfacePlane surface={node.surface} />
           <SurfaceBounds surface={node.surface} />
           {node.surface.layout.map((route, i) =>
             route.stacking ? <StackingCurve key={i} route={route} /> : null,