在本节中，我们要造一个鬼屋。用Three.js的基本几何体。并以米作为基本单位

我们先建造基本场景：一个地板、一个球体、一些灯光、不必有阴影、一个Dat.GUI面板。点击下载初始包

然后我们把球体移除

1.创建房子

1. 建立房子我们先创建一个Group

   const house = new THREE.Group()
   scene.add(house)

   2. 然后创建墙

   const walls = new THREE.Mesh(
       new THREE.BoxGeometry(4, 2.5, 4),
       new THREE.MeshStandardMaterial({ color: '#ac8e82' })
   )
   walls.position.y = 1.25 //避免防止墙一半在地板下面
   house.add(walls)

   3. 创建一个房顶

我们使用 ConeBufferGeometry 。调整它的细分程度即可变为金字塔性质

const roof = new THREE.Mesh(
    new THREE.ConeGeometry(3.5, 1, 4),
    new THREE.MeshStandardMaterial({ color: '#b35f45' })
)
roof.rotation.y = Math.PI * 0.25
roof.position.y = 2.5 + 0.5
house.add(roof)

## 4. 用平面创建一个门，并设置上材质

const door = new THREE.Mesh(
    new THREE.PlaneBufferGeometry(2, 2),
    new THREE.MeshStandardMaterial({ color: '#aa7b7b' })
)
door.position.y = 1
door.position.z = 2 + 0.01 //注意平面竞争（z-fighting
house.add(door)

5. 添加草丛

因为草丛都是一样的材质，形状。所以我们不是创建三个草丛几何体，而是创建三个网格

const bushGeometry = new THREE.SphereBufferGeometry(1, 16, 16)
const bushMaterial = new THREE.MeshStandardMaterial({color:'#89c854'})

const bush1 = new THREE.Mesh(bushGeometry, bushMaterial)
bush1.scale.set(0.5, 0.5, 0.5)
bush1.position.set(0.8, 0.2, 2.2)

const bush2 = new THREE.Mesh(bushGeometry, bushMaterial)
bush2.scale.set(0.25, 0.25, 0.25)
bush2.position.set(1.4, 0.1, 2.1)

const bush3 = new THREE.Mesh(bushGeometry, bushMaterial)
bush3.scale.set(0.4, 0.4, 0.4)
bush3.position.set(- 0.8, 0.1, 2.2)

const bush4 = new THREE.Mesh(bushGeometry, bushMaterial)
bush4.scale.set(0.15, 0.15, 0.15)
bush4.position.set(- 1, 0.05, 2.6)
house.add(bush1, bush2, bush3, bush4)

6. 添加坟墓

手动生成大量的坟墓会很耗时，所以我们就自动的生成并防止坟墓

首先我们创建一个坟墓组

const graves = new THREE.Group()
scene.add(graves)

const graveGeometry = new THREE.BoxBufferGeometry(0.6, 0.8, 0.2)
const graveMaterial = new THREE.MeshStandarMaterial({color: '#b2b6b1'})

//范围内随机生成坟墓
for(let i = 0; i< 50; i++){
    const angle = Math.random() * Math.pi * 2  
    const radius = 3 + Math.random() * 6
    const x = Math.sin(angle) * radius
    const z = Math.cos(angle) * radius
    
    const grave = new THREE.Mesh(graveGeometry, graveMaterial)
    grave.position.set(x, 0.3, z)
    graves.add(grave)
}

然后增加点随机旋转

//...
grave.rotation.y = (Math.random() - 0.5) * 1
grave.rotation.z = (Math.random() - 0.5) * 1

7. 灯光

然后调整灯光效果，并给一种蓝色的氛围色

const ambientLight = new THREE.AmbientLight('#b9d5ff', 0.12)

//...

const moonLight = new THREE.DirectionalLight('#b9d5ff', 0.12)

然后给门加上点光源

//Door light

const doorLight = new THREE.PointLight('ff7d46', 1, 7)
doorLight.position.set(0, 2.2, 2.7)
house.add(doorLight)

8.雾

three.js提供了Fog类添加雾,要激活雾就在 scene上添加fog属性

//Fog
const fog = new THREE.Fog('#ff0000', 2, 6)
scene.fog = fog

雾有三个属性：

• color

• near ——雾距离相机的距离单位，开始的位置

• far ——雾完全透明的距离

  调整一下颜色、近端和远端

  const fog = new THREE.Fog('#262837', 1, 15)

  

当镜头推远时会发现背景有很强的违和感，我们需要改变renderer的 clearColor 和雾一样的颜色

renderer.setClearColor('#262837')

这样一来背景和雾的颜色就一样了

9.添加材质

添加所有的材质

const doorColorTexture = textureLoader.load(' /textures/door/color.jpg' )
const doorAlphaTexture = textureLoader.load( ' /textures/door/alpha.jpg' )
const doorAmbdientocclusionTexture = textureLoader.load('/textures/door/ambientOcclusion.jpg')
const doorHeightTexture = textureLoader.load( '/textures/door/height.jpg' )
const doorNormalTexture = textureLoader.load('/textures/door/normal.jpg')
const doorMetalnessTexture = textureLoader.load('/textures/door/metalness.jpg')
const doorRoughnessTexture = textureLoader.load('/textures/door/roughness.jpg')

然后将他们添加到door上

const door = new THREE.Mesh(
    new THREE.PlaneBufferGeometry(2, 2, 100, 100),
    new THREE.MeshStandarMaterial({
        map:doorColorTexture,
        transparent: ture,
        alphaMap: doorAlphaTexture,
        aoMap: doorAmbdientocclusionTexture,
        displacementMap: doorHeightTexture,
        displaceMentScale: 0.1,
        normalMap: doorNormalTexture,
        metalnessMap:doorMetalnessTexture,
        roughnessMa:doorRoughnessTexture
        
    })
)

door.geometry.setAttribute('uv2', 
    new THREE.Float32BufferAttribute(door.geometry.attributes.uv.arry, 2)
)

调整门的位置

//...
new THREE.PlaneBufferGeometry(2.2, 2.2, 100, 100)

然后添加墙的材质

const bricksColorTexture = textureLoader.load('/textures/bricks/color.jpg')
const bricksAmbientOcclusionTexture = textureLoader.load('/textures/bricks/ambientOcclus,jpg')
const bricksNormalTexture = textureLoader.load('/textures/bricks/normal.jpg' )
const bricksRoughnessTexture = textureLoader.load( '/textures/bricks/roughness.jpg')

/// Walls

const walls = new THREE.Mesh(
    new THREE.BoxBufferGeometry(4, 2.5, 4),
    new THREE.MeshStandardMaterial({
        map: bricksColorTexture,
        aoMap: bricksAmbientOcclusionTexture,
        normalMap:bricksNormalTexture,
        roughnessMap: bricksRoughnessTexture
    })
)

walls.geometry.setAttribute(
    'uv2',
    new THREE.Float32BufferAttribute(walls.geometry.attributes.uv.arry, 2)
)

给草添加材质