feat: add loading effect

src/app/page.css

@@ -2,3 +2,22 @@
 	width: 100vw !important;
 	height: 100vh !important;
 }
+
+.loader {
+	position: fixed;
+	top: 0;
+	left: 0;
+	width: 100%;
+	height: 100%;
+	background: black;
+	z-index: 4444;
+	transition: opacity 1.0s ease-in-out;
+	pointer-events: none;
+
+	opacity: 1;
+	display: block;
+}
+
+.loader.hidden {
+	opacity: 0;
+}

src/app/page.tsx

@@ -3,7 +3,8 @@
 import {
 	Environment,
 	OrbitControls,
-	PerspectiveCamera
+	PerspectiveCamera,
+	useProgress
 } from '@react-three/drei';
 import { Canvas, useLoader, useFrame } from '@react-three/fiber';
 import {
@@ -24,7 +25,8 @@ import {
 	DoubleSide,
 	TextureLoader,
 	Color,
-	MeshStandardMaterial
+	MeshStandardMaterial,
+	FogExp2
 } from 'three';
 
 import './page.css';
@@ -613,57 +615,80 @@ const SealCube = forwardRef<Mesh>((props, ref) => {
 });
 SealCube.displayName = 'SealCube';
 
+function Loader() {
+	const { progress, active } = useProgress();
+	const [visible, setVisible] = useState(true);
+
+	useLayoutEffect(() => {
+		if (!active && progress === 100) {
+			const timeout = setTimeout(() => setVisible(false), 500);
+			return () => clearTimeout(timeout);
+		}
+	}, [progress, active]);
+
+	return (
+		<div
+			className={`loader ${!visible ? 'loader hidden' : ''}`}
+		/>
+	);
+}
+
 export default function Home() {
 	const [sealMesh, setSealMesh] = useState<Mesh | null>(null);
 
 	return (
-		<Canvas
-			shadows
-			camera={{ position: [0, 5, 15], fov: 50, far: 100 }}
-			gl={{ antialias: true }}
-			className='canvas'
-		>
-			<EffectComposer>
-				<DepthOfField target={[0, 3, 0]} focalLength={10} bokehScale={5} />
-				<Vignette />
-				<Noise opacity={0.05} />
-				<Bloom
-					intensity={2}
-					luminanceThreshold={0.5}
-					luminanceSmoothing={0.1}
+		<>
+			<Loader />
+			<Canvas
+				shadows
+				camera={{ position: [0, 5, 15], fov: 50, far: 100 }}
+				gl={{ antialias: true }}
+				className='canvas'
+			>
+				<EffectComposer>
+					<DepthOfField target={[0, 3, 0]} focalLength={10} bokehScale={5} />
+					<Vignette />
+					<Noise opacity={0.05} />
+					<Bloom
+						intensity={2}
+						luminanceThreshold={0.5}
+						luminanceSmoothing={0.1}
+					/>
+					<SMAA />
+				</EffectComposer>
+
+				<Environment files={'hdr/sky.hdr'} environmentIntensity={1} background />
+				<fogExp2 attach='fog' args={[0x9A9A9A, 0.01]} />
+
+
+				<Terrain
+					chunks={16}
+					chunkSize={10.0}
+					resolution={8.0}
+					scale={1}
+					hillScale={0.1}
+					hillHeight={6.0}
+					detailScale={1.0}
+					detailHeight={0.2}
+					wireframe={false}
+					grassCount={6000}
+					grassSize={0.6}
+					grassLOD={60}
+				/>
+				<SealCube
+					ref={(mesh) => {
+						if (mesh && !sealMesh) setSealMesh(mesh);
+					}}
 				/>
-				<SMAA />
-			</EffectComposer>
 
-			<Environment files={'hdr/sky.hdr'} environmentIntensity={1} background />
-
-			<Terrain
-				chunks={16}
-				chunkSize={10.0}
-				resolution={8.0}
-				scale={1}
-				hillScale={0.1}
-				hillHeight={6.0}
-				detailScale={1.0}
-				detailHeight={0.2}
-				wireframe={false}
-				grassCount={6000}
-				grassSize={0.6}
-				grassLOD={60}
-			/>
-			<SealCube
-				ref={(mesh) => {
-					if (mesh && !sealMesh) setSealMesh(mesh);
-				}}
-			/>
-
-			<OrbitControls
-				target={[0, 3, 0]}
-				enablePan={false}
-				makeDefault
-				minDistance={2}
-				maxDistance={10}
-			/>
-		</Canvas>
+				<OrbitControls
+					target={[0, 3, 0]}
+					enablePan={false}
+					makeDefault
+					minDistance={2}
+					maxDistance={10}
+				/>
+			</Canvas>
+		</>
 	);
 }