Using React-Three-Fiber

Question

我目前正在使用React Three Fiber来简单地渲染太阳和地球绕其运行以测试它。然而，在每次运行开发服务器进行测试时，我添加了将纹理应用于各个球体的代码后，球体无法渲染。我试着寻找有同样问题的人，但没有任何运气。这是我的程序代码。

import React, { useRef, useState } from 'react'
import { Canvas, useFrame, useLoader } from 'react-three-fiber'
import { TextureLoader } from 'three/src/loaders/TextureLoader'
import { useTexture } from "@react-three/drei";
function Sun(props) {
const [colorMap] = useTexture(['Sun_texture.jpg'])
const mesh = useRef()
const [state, setState] = useState({ isHovered: false, isActive: false })
useFrame((state) => {
const time = state.clock.getElapsedTime()
mesh.current.rotation.z = 0
mesh.current.rotation.x = 0
mesh.current.rotation.y = time / 5
})
return (
<mesh
{...props}
ref={mesh}

scale={[1, 1, 1]}
onPointerOver={(e) => setState({ ...state, isHovered: true })}
onPointerOut={(e) => setState({ ...state, isHovered: false })}>
<sphereGeometry args={[0.5, 100, 100]} map={colorMap} />
<meshStandardMaterial map={colorMap} transparent={true} emissive={'#444444'} emissiveIntensity={0.3}/>
</mesh>
)
}
function Earth(props) {
const mesh = useRef()
const [state, setState] = useState({ isHovered: false, isActive: false })
const [colorMap] = useTexture(['Earth_texture.jpg'])
useFrame((state) => {
const time = state.clock.getElapsedTime()
mesh.current.position.x = 4 * Math.sin(time / 10)
mesh.current.position.y = 0
mesh.current.position.z = 4 * Math.cos(time / 10)
mesh.current.rotation.z = 0
mesh.current.rotation.x = 0
mesh.current.rotation.y = time / 2
})
return (
<mesh
{...props}
ref={mesh}
scale={[0.5, 0.5, 0.5]}
onPointerOver={(e) => setState({ ...state, isHovered: true })}
onPointerOut={(e) => setState({ ...state, isHovered: false })}>
<sphereBufferGeometry args={[0.5, 40, 40]} map={colorMap} />
<meshStandardMaterial map={colorMap} />
</mesh>
)
}

export default function App() {
return (
<Canvas camera={{position: [0, 2, 8]}}>
<Sun position={[0, 0, 0]} />
<Earth position={[3, 0, 0]} />
<ambientLight intensity={0.01}/>
<pointLight position={[0, 0, 0]}/>

<spotLight position={[1.5, 0, 0]} distance={4}/>
<spotLight position={[-1.5, 0, 0]} distance={4}/>
<spotLight position={[0, 0, -1.5]} distance={4}/>
<spotLight position={[0, 0, 1.5]} distance={4}/>
<spotLight position={[0, 1.5, 0]} distance={4}/>
<spotLight position={[0, -1.5, 0]} distance={4}/>
</Canvas>
)
}

特别是纹理部分是问题所在，但我找不到任何问题

const [colorMap] = useTexture(['Sun_texture.jpg'])
...
<sphereGeometry args={[0.5, 100, 100]} map={colorMap} />
<meshStandardMaterial map={colorMap} transparent={true} emissive={'#444444'} emissiveIntensity={0.3}/>

Answer 1

您需要将<Earth>组件放在<Suspense>中，因为它需要加载纹理，所以执行此操作的方法是使用挂起等待其加载。

您可以通过指定加载时要显示的对象

<suspense fallback={<loadingComponent />} >

所以这会给你一些类似的东西：

import React, { useRef, useState, Suspense } from 'react'
import { Canvas, useFrame, useLoader } from 'react-three-fiber'
import { TextureLoader } from 'three/src/loaders/TextureLoader'
import { useTexture } from "@react-three/drei";
function Sun(props) {
const [colorMap] = useTexture(['Sun_texture.jpg'])
const mesh = useRef()
const [state, setState] = useState({ isHovered: false, isActive: false })
useFrame((state) => {
const time = state.clock.getElapsedTime()
mesh.current.rotation.z = 0
mesh.current.rotation.x = 0
mesh.current.rotation.y = time / 5
})
return (
<mesh
{...props}
ref={mesh}

scale={[1, 1, 1]}
onPointerOver={(e) => setState({ ...state, isHovered: true })}
onPointerOut={(e) => setState({ ...state, isHovered: false })}>
<sphereGeometry args={[0.5, 100, 100]} map={colorMap} />
<meshStandardMaterial map={colorMap} transparent={true} emissive={'#444444'} emissiveIntensity={0.3}/>
</mesh>
)
}
function Earth(props) {
const mesh = useRef()
const [state, setState] = useState({ isHovered: false, isActive: false })
const [colorMap] = useTexture(['Earth_texture.jpg'])
useFrame((state) => {
const time = state.clock.getElapsedTime()
mesh.current.position.x = 4 * Math.sin(time / 10)
mesh.current.position.y = 0
mesh.current.position.z = 4 * Math.cos(time / 10)
mesh.current.rotation.z = 0
mesh.current.rotation.x = 0
mesh.current.rotation.y = time / 2
})
return (
<mesh
{...props}
ref={mesh}
scale={[0.5, 0.5, 0.5]}
onPointerOver={(e) => setState({ ...state, isHovered: true })}
onPointerOut={(e) => setState({ ...state, isHovered: false })}>
<sphereBufferGeometry args={[0.5, 40, 40]} map={colorMap} />
<meshStandardMaterial map={colorMap} />
</mesh>
)
}

export default function App() {
return (
<Canvas camera={{position: [0, 2, 8]}}>
<Sun position={[0, 0, 0]} />
<Suspense fallback={<Loading />}>
<Earth position={[3, 0, 0]} />
</Suspense>
<ambientLight intensity={0.01}/>
<pointLight position={[0, 0, 0]}/>

<spotLight position={[1.5, 0, 0]} distance={4}/>
<spotLight position={[-1.5, 0, 0]} distance={4}/>
<spotLight position={[0, 0, -1.5]} distance={4}/>
<spotLight position={[0, 0, 1.5]} distance={4}/>
<spotLight position={[0, 1.5, 0]} distance={4}/>
<spotLight position={[0, -1.5, 0]} distance={4}/>
</Canvas>
)
}

你可以在codeSandbox上找到关于reactthree-fiber的很酷的东西和例子。

https://codesandbox.io/search?refinementList%5Bnpm_dependencies.dependency%5D%5B0%5D=%40react-三%2Ffiber&page=1&配置%5HitsPerPage%5D=12&query=

如果你需要更精确的信息，请告诉我。