几何体_顶点_索引_面之BufferGeometry
代码
js
import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js'
import { GUI } from 'three/examples/jsm/libs/lil-gui.module.min.js';
const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(
45,
window.innerWidth / window.innerHeight,
0.1,
1000
)
const renderer = new THREE.WebGLRenderer()
renderer.setSize(window.innerWidth, window.innerHeight)
document.body.appendChild(renderer.domElement)
const geometry = new THREE.BufferGeometry()
// 使用顶点绘制:创建顶点数据, 顶点是有序的,每三个为一个顶点,逆时针为正面
// const vertices = new Float32Array([
// // 三角形
// // -1.0, -1.0, 0.0,
// // 1.0, -1.0, 0.0,
// // 1.0, 1.0, 0.0,
// // 三角形
// // -1.0, -1.0, 0.0,
// // 1.0, 1.0, 0.0,
// // 1.0, -1.0, 0.0,
// // 正方形:两个三角形组成
// -1.0, -1.0, 0.0,1.0, -1.0, 0.0, 1.0, 1.0, 0.0,
// 1.0, 1.0, 0.0, -1.0, 1.0, 0.0, -1.0, -1.0, 0.0,
// ])
// // 创建顶点属性
// geometry.setAttribute(
// 'position',
// // 3个数据为一个顶点
// new THREE.BufferAttribute(vertices, 3),
// )
// 使用索引绘制
const vertices = new Float32Array([
-1.0, -1.0, 0.0, 1.0, -1.0, 0.0, 1.0, 1.0, 0.0, -1.0, 1.0, 0
])
// 创建顶点属性
geometry.setAttribute(
'position',
new THREE.BufferAttribute(vertices, 3),
)
// 创建索引
const indices = new Uint16Array([0, 1, 2, 2, 3, 0])
// 设置索引属性
geometry.setIndex(new THREE.BufferAttribute(indices, 1))
// 创建材质
const material = new THREE.MeshBasicMaterial({
color: 0x00ff00,
// side: THREE.DoubleSide, // 双面显示
wireframe: true, // 线框模式
})
const plane = new THREE.Mesh(geometry, material)
scene.add(plane)
camera.position.z = 5;
camera.position.y = 2;
camera.position.x = 2;
camera.lookAt(0, 0, 0)
const axesHelper = new THREE.AxesHelper(5);
scene.add(axesHelper);
const controls = new OrbitControls(camera, renderer.domElement);
controls.enableDamping = true;
controls.dampingFactor = 0.05;
function animate() {
requestAnimationFrame(animate)
controls.update()
renderer.render(scene, camera)
}
animate()
window.addEventListener('resize', () => {
renderer.setSize(window.innerWidth, innerHeight)
camera.aspect = window.innerWidth / window.innerHeight
camera.updateProjectionMatrix()
})
let eventObj = {
Fullscreen: function () {
document.body.requestFullscreen()
},
ExitFullscreen: function () {
document.exitFullscreen()
}
}
const gui = new GUI()
gui.add(eventObj, 'Fullscreen').name('全屏')
gui.add(eventObj, 'ExitFullscreen').name('退出全屏')
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
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