Docs

Hover Wave Shader

A interactive and customizable shader effect that generates dynamic waves based on hover interactions, ideal for adding engaging visual effects to backgrounds.

Installation

Install dependencies

npm install

npm install @react-three/fiber @react-three/drei gsap

Add the shader file

components/shaders/mouse-wave-shader

// Classic 3D Perlin Noise created by Stefan Gustavson
 
export const vertex = `
vec4 permute(vec4 x){return mod(((x*34.0)+1.0)*x, 289.0);}
vec4 taylorInvSqrt(vec4 r){return 1.79284291400159 - 0.85373472095314 * r;}
vec3 fade(vec3 t) {return t*t*t*(t*(t*6.0-15.0)+10.0);}
 
float cnoise(vec3 P){
  vec3 Pi0 = floor(P); 
  vec3 Pi1 = Pi0 + vec3(1.0);
  Pi0 = mod(Pi0, 289.0);
  Pi1 = mod(Pi1, 289.0);
  vec3 Pf0 = fract(P);
  vec3 Pf1 = Pf0 - vec3(1.0);
  vec4 ix = vec4(Pi0.x, Pi1.x, Pi0.x, Pi1.x);
  vec4 iy = vec4(Pi0.yy, Pi1.yy);
  vec4 iz0 = Pi0.zzzz;
  vec4 iz1 = Pi1.zzzz;
 
  vec4 ixy = permute(permute(ix) + iy);
  vec4 ixy0 = permute(ixy + iz0);
  vec4 ixy1 = permute(ixy + iz1);
 
  vec4 gx0 = ixy0 / 7.0;
  vec4 gy0 = fract(floor(gx0) / 7.0) - 0.5;
  gx0 = fract(gx0);
  vec4 gz0 = vec4(0.5) - abs(gx0) - abs(gy0);
  vec4 sz0 = step(gz0, vec4(0.0));
  gx0 -= sz0 * (step(0.0, gx0) - 0.5);
  gy0 -= sz0 * (step(0.0, gy0) - 0.5);
 
  vec4 gx1 = ixy1 / 7.0;
  vec4 gy1 = fract(floor(gx1) / 7.0) - 0.5;
  gx1 = fract(gx1);
  vec4 gz1 = vec4(0.5) - abs(gx1) - abs(gy1);
  vec4 sz1 = step(gz1, vec4(0.0));
  gx1 -= sz1 * (step(0.0, gx1) - 0.5);
  gy1 -= sz1 * (step(0.0, gy1) - 0.5);
 
  vec3 g000 = vec3(gx0.x,gy0.x,gz0.x);
  vec3 g100 = vec3(gx0.y,gy0.y,gz0.y);
  vec3 g010 = vec3(gx0.z,gy0.z,gz0.z);
  vec3 g110 = vec3(gx0.w,gy0.w,gz0.w);
  vec3 g001 = vec3(gx1.x,gy1.x,gz1.x);
  vec3 g101 = vec3(gx1.y,gy1.y,gz1.y);
  vec3 g011 = vec3(gx1.z,gy1.z,gz1.z);
  vec3 g111 = vec3(gx1.w,gy1.w,gz1.w);
 
  vec4 norm0 = taylorInvSqrt(vec4(dot(g000, g000), dot(g010, g010), dot(g100, g100), dot(g110, g110)));
  g000 *= norm0.x;
  g010 *= norm0.y;
  g100 *= norm0.z;
  g110 *= norm0.w;
  vec4 norm1 = taylorInvSqrt(vec4(dot(g001, g001), dot(g011, g011), dot(g101, g101), dot(g111, g111)));
  g001 *= norm1.x;
  g011 *= norm1.y;
  g101 *= norm1.z;
  g111 *= norm1.w;
 
  float n000 = dot(g000, Pf0);
  float n100 = dot(g100, vec3(Pf1.x, Pf0.yz));
  float n010 = dot(g010, vec3(Pf0.x, Pf1.y, Pf0.z));
  float n110 = dot(g110, vec3(Pf1.xy, Pf0.z));
  float n001 = dot(g001, vec3(Pf0.xy, Pf1.z));
  float n101 = dot(g101, vec3(Pf1.x, Pf0.y, Pf1.z));
  float n011 = dot(g011, vec3(Pf0.x, Pf1.yz));
  float n111 = dot(g111, Pf1);
 
  vec3 fade_xyz = fade(Pf0);
  vec4 n_z = mix(vec4(n000, n100, n010, n110), vec4(n001, n101, n011, n111), fade_xyz.z);
  vec2 n_yz = mix(n_z.xy, n_z.zw, fade_xyz.y);
  float n_xyz = mix(n_yz.x, n_yz.y, fade_xyz.x); 
  return 2.2 * n_xyz;
}
 
 
  uniform float uTime;
  uniform vec2 uHover;
  uniform float uHoverState;
  
  varying float vNoise;
  varying vec2  vUv;
  
 
  void main() {
    vec3 newposition = position;
    float PI = 3.1415925;
 
    float noise = cnoise(3.*vec3(position.x,position.y,position.z + uTime/30.));
 
    float dist = distance(uv, uHover);
 
    newposition.z += uHoverState*10.*sin(dist*10. + uTime);
    
    vNoise = uHoverState*sin(dist*10. - uTime);
    vUv = uv;
 
    gl_Position = projectionMatrix * modelViewMatrix * vec4( newposition, 1.0);
  }
`
 
export const fragment =`
 
varying float vNoise;
varying vec2 vUv;
uniform sampler2D uTexture;
uniform float uHoverState;
uniform float uTime;
 
  void main() {
  vec2 newUV = vUv;
 
  vec2 p = newUV;
  float x = uHoverState;
  x = smoothstep(.0,1.0,(x*2.0+p.y-1.0));
  vec4 f = mix(
    texture2D(uTexture, (p-.5)*(1.-x)+.5), 
    texture2D(uTexture, (p-.5)*x+.5), 
    x);
 
  vec4 color = texture2D(uTexture, vUv);
    gl_FragColor = f;
  }
`

Copy the hover-wave component

hover-wave.tsx

import React, { useRef, useEffect, useState } from "react";
import { fragment, vertex } from "@/components/shaders/hover-wave-shader";
import { useFrame, useThree } from "@react-three/fiber";
import { useTexture } from "@react-three/drei";
import * as THREE from "three";
import gsap from "gsap";
 
interface HoverWaveProps {
  imagePath: string;
  cameraDistance?: number;
}
 
export default function HoverWave({
  imagePath,
  cameraDistance = 700,
}: HoverWaveProps) {
  const plane = useRef<THREE.Mesh>(null);
  const texture = useTexture(imagePath);
  const { raycaster, camera, size } = useThree();
  const [planeSize, setPlaneSize] = useState<[number, number]>([1, 1]);
 
  const uniforms = useRef({
    uTexture: { value: texture },
    uTime: { value: 0 },
    uHover: { value: new THREE.Vector2(0.5, 0.5) },
    uHoverState: { value: 0 },
  });
 
  useEffect(() => {
    const adjustCameraAndPlaneSize = () => {
      const { width } = size;
 
      const imageRatio = texture.image.width / texture.image.height;
 
      const planeWidth = width / 2;
      const planeHeight = planeWidth / imageRatio;
 
      setPlaneSize([planeWidth, planeHeight]);
 
      const fov = (2 * Math.atan(planeHeight / 2 / 600) * 180) / Math.PI;
      camera.fov = fov;
      camera.position.z = cameraDistance;
      camera.updateProjectionMatrix();
    };
 
    adjustCameraAndPlaneSize();
    window.addEventListener("resize", adjustCameraAndPlaneSize);
 
    return () => {
      window.removeEventListener("resize", adjustCameraAndPlaneSize);
    };
  }, [size, camera]);
 
  useFrame((state) => {
    if (plane.current) {
      (plane.current.material as THREE.ShaderMaterial).uniforms.uTime.value =
        state.clock.elapsedTime;
    }
  });
 
  const handlePointerMove = (event: THREE.Event) => {
    raycaster.setFromCamera(event.pointer, camera);
    const intersects = raycaster.intersectObject(plane.current!);
 
    if (intersects.length > 0) {
      const obj = intersects[0].object as THREE.Mesh;
      (obj.material as THREE.ShaderMaterial).uniforms.uHover.value =
        intersects[0].uv;
    }
  };
 
  const handlePointerEnter = () => {
    gsap.to(uniforms.current.uHoverState, {
      duration: 1,
      value: 1,
    });
  };
 
  const handlePointerLeave = () => {
    gsap.to(uniforms.current.uHoverState, {
      duration: 1,
      value: 0,
    });
  };
 
  return (
    <mesh
      ref={plane}
      onPointerMove={handlePointerMove}
      onPointerEnter={handlePointerEnter}
      onPointerLeave={handlePointerLeave}
    >
      <planeGeometry args={[planeSize[0], planeSize[1], 45, 45]} />
      <shaderMaterial
        side={THREE.DoubleSide}
        vertexShader={vertex}
        fragmentShader={fragment}
        uniforms={uniforms.current}
      />
    </mesh>
  );
}

Copy the source code

hover-wave-scene.tsx

import React from "react";
import HoverWave from "@/components/hover-wave";
import { Canvas } from "@react-three/fiber";
 
interface HoverWaveSceneProps {
  imagePath: string;
  cameraDistance?: number;
}
 
export default function HoverWaveScene({
  imagePath,
  cameraDistance,
}: HoverWaveSceneProps) {
  return (
    <Canvas>
      <HoverWave imagePath={imagePath} cameraDistance={cameraDistance} />
    </Canvas>
  );
}

Props

HoverWave Props

Prop	Type	Description	Default
imagePath	String	The path to the image that will be used as the texture.	-
cameraDistance	Number	The distance of the camera from the object.	700

HoverWaveScene Props

Prop	Type	Description	Default
imagePath	String	The path to the image that will be passed to HoverWave.	-
cameraDistance	Number	The distance of the camera from the object.	-

Note

If you're using Next.js, make sure to use dynamic import for the hover-wave-scene component. You can also add a placeholder during the loading phase if needed.

The component should be updated to make customizing the effect easier for users. In the meantime, if you want to experiment, I recommend using "Leva" for real-time adjustments.

Credits

The shader used in this component was created by Stefan Gustavson @stegu

The images are from ShadcnUI

I drew a lot of inspiration from Akella's work for the creation of these components. You can find plenty of shaders here if you'd like to experiment @akella

Mouse Wave Shader Pixel Distorsion Shader

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