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Lights

Video Lecture

Section Video Links
Lights Lights Lights

Description

Let's add a few different types of lights to the scene, and see how they affect the different materials.

./src/App.jsx

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import { Canvas } from '@react-three/fiber'
import Polyhedron from './Polyhedron'
import * as THREE from 'three'
import { Stats, OrbitControls } from '@react-three/drei'
import { useControls } from 'leva'
import { useRef } from 'react'

function Lights() {
  const ambientRef = useRef()
  const directionalRef = useRef()
  const pointRef = useRef()
  const spotRef = useRef()

  useControls('Ambient Light', {
    visible: {
      value: false,
      onChange: (v) => {
        ambientRef.current.visible = v
      },
    },
    color: {
      value: 'white',
      onChange: (v) => {
        ambientRef.current.color = new THREE.Color(v)
      },
    },
  })

  useControls('Directional Light', {
    visible: {
      value: true,
      onChange: (v) => {
        directionalRef.current.visible = v
      },
    },
    position: {
      x: 1,
      y: 1,
      z: 1,
      onChange: (v) => {
        directionalRef.current.position.copy(v)
      },
    },
    color: {
      value: 'white',
      onChange: (v) => {
        directionalRef.current.color = new THREE.Color(v)
      },
    },
  })

  useControls('Point Light', {
    visible: {
      value: false,
      onChange: (v) => {
        pointRef.current.visible = v
      },
    },
    position: {
      x: 2,
      y: 0,
      z: 0,
      onChange: (v) => {
        pointRef.current.position.copy(v)
      },
    },
    color: {
      value: 'white',
      onChange: (v) => {
        pointRef.current.color = new THREE.Color(v)
      },
    },
  })

  useControls('Spot Light', {
    visible: {
      value: false,
      onChange: (v) => {
        spotRef.current.visible = v
      },
    },
    position: {
      x: 3,
      y: 2.5,
      z: 1,
      onChange: (v) => {
        spotRef.current.position.copy(v)
      },
    },
    color: {
      value: 'white',
      onChange: (v) => {
        spotRef.current.color = new THREE.Color(v)
      },
    },
  })

  return (
    <>
      <ambientLight ref={ambientRef} />
      <directionalLight ref={directionalRef} />
      <pointLight ref={pointRef} />
      <spotLight ref={spotRef} />
    </>
  )
}

export default function App() {
  return (
    <Canvas camera={{ position: [4, 4, 1.5] }}>
      <Lights />
      <Polyhedron
        name="meshBasicMaterial"
        position={[-3, 1, 0]}
        material={
          new THREE.MeshBasicMaterial({ color: 'yellow', flatShading: true })
        }
      />
      <Polyhedron
        name="meshNormalMaterial"
        position={[-1, 1, 0]}
        material={new THREE.MeshNormalMaterial({ flatShading: true })}
      />
      <Polyhedron
        name="meshPhongMaterial"
        position={[1, 1, 0]}
        material={
          new THREE.MeshPhongMaterial({ color: 'lime', flatShading: true })
        }
      />
      <Polyhedron
        name="meshStandardMaterial"
        position={[3, 1, 0]}
        material={
          new THREE.MeshStandardMaterial({
            color: 0xff0033,
            flatShading: true,
          })
        }
      />
      <OrbitControls target={[2, 2, 0]} />
      <axesHelper args={[5]} />
      <gridHelper />
      <Stats />
    </Canvas>
  )
}

./src/Polyhedron.jsx

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import { useRef } from 'react'
import { useFrame } from '@react-three/fiber'

export default function Polyhedron(props) {
  const ref = useRef()

  useFrame((_, delta) => {
    ref.current.rotation.x += 0.2 * delta
    ref.current.rotation.y += 0.05 * delta
  })

  return (
    <mesh {...props} ref={ref}>
      <icosahedronGeometry args={[1, 1]} />
    </mesh>
  )
}
Light threejs.org sbcode.net
AmbientLight threejs.org sbcode.net
DirectionalLight threejs.org sbcode.net
SpotLight threejs.org sbcode.net
PointLight threejs.org sbcode.net

Working Example