Skip to content

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.

Note

Since Three r155, the default of WebGLRenderer.useLegacyLights was changed from true to false and will also be deprecated in r165. This means that intensity may need to be changed when using various types of lights if you want them to match your previous versions of Threejs. Light strength can be restored by multiplying PI with the existing light intensity values.

E.g., if your intensity was 2, then use

<directionalLight
    position={[3.3, 1.0, 4.4]}
    castShadow
    intensity={Math.PI * 2}
  />

./src/App.jsx

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
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

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
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>
  )
}

Working Example

<>
Lights (Working Example) sbedit.net
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

GitHub Branch

git clone https://github.com/Sean-Bradley/React-Three-Fiber-Boilerplate.git
cd React-Three-Fiber-Boilerplate
git checkout lights
npm install
npm start

Comments