Orillusion色键材质(过滤背景色)
色键 (ChromaKey) 材质在 Video 材质之上添加了过滤了背景色的功能，支持基本的视频材质UV以下属性：
| 属性 | 描述 |
|---|---|
| baseColor | 基础颜色 |
| uv_offsetX | x方向位移 |
| uv_offsetY | y方向位移 |
| uv_scaleX | x方向缩放 |
| uv_scaleY | y方向缩放 |
| clip_left | 左方裁剪 |
| clip_top | 上方裁剪 |
| clip_right | 右方裁剪 |
| clip_bottom | 下方裁剪 |
另外，ChromaKeyMaterial 还提供背景色过滤功能:
| 属性 | 描述 |
|---|---|
| keyColor | 背景关键色 |
| colorCutoff | 镂空强度 |
| colorFeathering | 颜色羽化系数 |
| maskFeathering | 边缘羽化系数 |
| sharpening | 边缘锐化系数 |
| despoil | 环境光削弱系数 |
| despoilLuminanceAdd | 削弱后补光强度 |
用法
ts
import {ChromaKeyMaterial, VideoTexture} from '@orillusion/media-extention'
// 创建视频纹理
let videoTexture = new VideoTexture();
await videoTexture.load('path/to/video')
// 创建视频材质
let mat = new ChromaKeyMaterial();
mat.baseMap = videoTexture;
// 设置过滤绿色
mat.keyColor = new Color(0.0, 1.0, 0.0, 0.0)
mat.colorCutoff = 0.2
ts
import {
Engine3D, Vector3, Scene3D, Object3D, Camera3D, ForwardRenderJob, MeshRenderer, HoverCameraController, PlaneGeometry, GUIHelp, Color
} from "@orillusion/core";
import { VideoTexture,ChromaKeyMaterial } from "@orillusion/media-extention"
async function demo() {
await Engine3D.init();
GUIHelp.init();
let scene = new Scene3D();
let camera = new Object3D();
scene.addChild(camera)
let mainCamera = camera.addComponent(Camera3D);
mainCamera.perspective(60, window.innerWidth / window.innerHeight, 0.1, 10000.0);
let hc = camera.addComponent(HoverCameraController);
hc.setCamera(0, 0, 2);
// 创建视频纹理
let videoTexture = new VideoTexture();
await videoTexture.load('https://cdn.orillusion.com/videos/chromakey.webm')
// 创建视频(背景过滤)材质
let mat = new ChromaKeyMaterial();
mat.baseMap = videoTexture;
mat.roughness = 1;
mat.debug();
// 设置过滤
mat.keyColor = new Color(0,1,0,0)
mat.colorCutoff = 0.06
mat.colorFeathering = 0.25
// 创建2D平面
let planeObj = new Object3D();
let mr = planeObj.addComponent(MeshRenderer);
mr.geometry = new PlaneGeometry(2, 2, 10, 10, Vector3.Z_AXIS);
mr.material = mat;
scene.addChild(planeObj);
let renderJob = new ForwardRenderJob(scene);
Engine3D.startRender(renderJob);
}
demo();