@visactor/vrender-core/es/core/light.js

```typescript import { xxx } from '@visactor/vrender-core'; ```

import { isString, max, min, sqrt } from "@visactor/vutils";

import { ColorStore, ColorType } from "../color-string";

import { Factory } from "../factory";

export class DirectionalLight {
    constructor(dir, color, ambient = .8) {
        this.dir = dir, this.color = color, this.colorRgb = ColorStore.Get(color, ColorType.Color1), 
        this.ambient = ambient;
        const length = sqrt(dir[0] * dir[0] + dir[1] * dir[1] + dir[2] * dir[2]);
        this.formatedDir = [ dir[0] / length, dir[1] / length, dir[2] / length ];
    }
    computeColor(normal, color) {
        const lightDir = this.formatedDir, brightness = min(max((normal[0] * lightDir[0] + normal[1] * lightDir[1] + normal[2] * lightDir[2]) * (1 - this.ambient / 2), 0) + this.ambient, 1);
        let colorArray;
        colorArray = isString(color) ? ColorStore.Get(color, ColorType.Color1) : color;
        const lightColorArray = this.colorRgb;
        return `rgb(${lightColorArray[0] * colorArray[0] * brightness}, ${lightColorArray[1] * colorArray[1] * brightness}, ${lightColorArray[2] * colorArray[2] * brightness})`;
    }
}

export const registerDirectionalLight = () => {
    Factory.registerPlugin("DirectionalLight", DirectionalLight);
};
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