视频材质

该材质继承于 UnLit 材质，同样不计算光照，仅通过视频像素颜色渲染的基础材质，不同的是，可以自动同步视频播放的帧内容，另外，也增加了空间裁剪 rectClip 的设置，可以更自由的进行裁剪。

视频材质支持以下属性：

属性	类型	描述
baseMap	VideoTexture	视频贴图
baseColor	Color	基础颜色
rectClip	Vector4	上下左右裁剪区域

用法

import {VideoMaterial, VideoTexture} from '@orillusion/media-extention'

// 创建视频纹理
let videoTexture = new VideoTexture();
await videoTexture.load('https://cdn.orillusion.com/videos/bunny.mp4')
// 创建视频材质
let mat = new VideoMaterial();
mat.baseMap = videoTexture;
// 设置基础颜色
mat.baseColor = new Color(1, 1, 1, 1)
// 设置裁剪区域, left/top/right/bottom
mat.rectClip = new Vector4(0, 0, 0, 0);

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import { Engine3D, Vector3, Scene3D, Object3D, Camera3D, View3D, MeshRenderer, HoverCameraController, PlaneGeometry, Color, Vector4 } from '@orillusion/core'
import { VideoTexture, VideoMaterial } from '@orillusion/media-extention'
import * as dat from 'dat.gui'

await Engine3D.init()
let scene = new Scene3D()
let camera = new Object3D()
scene.addChild(camera)
let mainCamera = camera.addComponent(Camera3D)
mainCamera.perspective(60, Engine3D.aspect, 0.1, 10000.0)
let hc = camera.addComponent(HoverCameraController)
hc.setCamera(0, 0, 2)

// create a video texture
let videoTexture = new VideoTexture()
await videoTexture.load('https://cdn.orillusion.com/videos/bunny.mp4')
// create a video material
let mat = new VideoMaterial()
mat.baseMap = videoTexture

// create a 2D plane to play the video
let planeObj = new Object3D()
let mr = planeObj.addComponent(MeshRenderer)
mr.geometry = new PlaneGeometry(2, (2 * 9) / 16, 1, 1, Vector3.Z_AXIS)
mr.material = mat
scene.addChild(planeObj)

let view = new View3D()
view.scene = scene
view.camera = mainCamera
// start render
Engine3D.startRenderView(view)

let gui = new dat.GUI()
let f = gui.addFolder('Video')
f.addColor({ baseColor: [255, 255, 255] }, 'baseColor').onChange((v) => {
    mat.baseColor = new Color(v[0]/255, v[1]/255, v[2]/255, 1)
})
let clip = new Vector4(0,0,0,0)
f.add(clip, 'x', 0, 1, 0.01).name('left').onChange(() => mat.rectClip = clip)
f.add(clip, 'y', 0, 1, 0.01).name('top').onChange(() => mat.rectClip = clip)
f.add(clip, 'z', 0, 1, 0.01).name('right').onChange(() => mat.rectClip = clip)
f.add(clip, 'w', 0, 1, 0.01).name('bottom').onChange(() => mat.rectClip = clip)
f.open()