feat: add net shader

src/components/three/NetTest.tsx

@@ -0,0 +1,25 @@
+import { useRef } from "react";
+import { useFrame } from "@react-three/fiber";
+import * as THREE from "three";
+import { createNetShader } from "@/shaders/NetShader";
+
+export function NetTest(): React.JSX.Element {
+  const materialRef = useRef<THREE.ShaderMaterial>(null);
+
+  useFrame((_, delta) => {
+    if (materialRef.current) {
+      materialRef.current.uniforms.uTime.value += delta;
+    }
+  });
+
+  return (
+    <mesh position={[0, 2, -5]}>
+      <planeGeometry args={[2, 2, 1, 1]} />
+      <primitive
+        object={createNetShader()}
+        ref={materialRef}
+        attach="material"
+      />
+    </mesh>
+  );
+}

src/shaders/NetShader.ts

@@ -0,0 +1,62 @@
+import { ShaderMaterial } from "three";
+
+export const createNetShader = (): ShaderMaterial => {
+  return new ShaderMaterial({
+    transparent: true,
+    depthWrite: false,
+    uniforms: {
+      uTime: { value: 0 },
+      uGridScale: { value: 15.0 },
+      uPincushionStrength: { value: 0.4 },
+      uBloomIntensity: { value: 0.8 },
+      uGridThickness: { value: 0.05 },
+    },
+    vertexShader: `
+      varying vec2 vUv;
+      
+      void main() {
+        vUv = uv;
+        gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
+      }
+    `,
+    fragmentShader: `
+      uniform float uTime;
+      uniform float uGridScale;
+      uniform float uPincushionStrength;
+      uniform float uBloomIntensity;
+      uniform float uGridThickness;
+      
+      varying vec2 vUv;
+      
+      vec2 applyPincushion(vec2 uv, float strength) {
+        vec2 center = uv - 0.5;
+        float dist = length(center);
+        float distortion = 1.0 + dist * dist * strength;
+        return center * distortion + 0.5;
+      }
+      
+      float grid(vec2 uv, float scale, float thickness) {
+        vec2 gridUV = fract(uv * scale);
+        
+        float edgeX = step(gridUV.x, thickness) + step(1.0 - thickness, gridUV.x);
+        float edgeY = step(gridUV.y, thickness) + step(1.0 - thickness, gridUV.y);
+        
+        float line = min(edgeX + edgeY, 1.0);
+        
+        return line;
+      }
+      
+      void main() {
+        vec2 uv = applyPincushion(vUv, uPincushionStrength);
+        
+        float gridPattern = grid(uv, uGridScale, uGridThickness);
+        
+        vec3 gridColor = vec3(1.0, 0.4, 0.7);
+        float bloom = gridPattern * uBloomIntensity;
+        vec3 col = gridColor * (0.3 + bloom);
+        
+        gl_FragColor = vec4(col, gridPattern * 0.95);
+      }
+    `,
+  });
+};

src/world/World.tsx

@@ -28,6 +28,7 @@ import { GameMap } from "@/world/GameMap";
 import { GameStageContent } from "@/world/GameStageContent";
 import { Player } from "@/world/player/Player";
 import { TestMap } from "@/world/debug/TestMap";
+import { NetTest } from "@/components/three/NetTest";
 import type { SceneLoadingChangeHandler } from "@/types/world/sceneLoading";
 
 interface WorldProps {
@@ -98,7 +99,10 @@ export function World({ onLoadingStateChange }: WorldProps): React.JSX.Element {
           ) : null}
         </>
       ) : (
-        <TestMap onOctreeReady={handleOctreeReady} />
+        <>
+          <TestMap onOctreeReady={handleOctreeReady} />
+          <NetTest />
+        </>
       )}
 
       {sceneMode !== "game" && spawnPlayer ? (