Adding typings for THREE.Lut (#34122)

types/three/index.d.ts

@@ -43,6 +43,7 @@ export * from './three-FirstPersonControls';
 export * from './three-gltfexporter';
 export * from './three-gltfloader';
 export * from './three-lensflare';
+export * from './three-lut';
 export * from './three-mapcontrols';
 export * from './three-maskpass';
 export * from './three-mtlloader';

types/three/three-lut.d.ts

@@ -0,0 +1,31 @@
+// https://github.com/mrdoob/three.js/blob/master/examples/js/math/Lut.js
+
+import { Color, Mesh, Vector3 } from './three-core';
+
+export type ColorMapKeyword = 'rainbow'|'cooltowarm'|'blackbody'|'grayscale';
+
+export class Lut {
+  constructor(colormap: ColorMapKeyword, numberofcolors: number);
+
+  addColorMap(colormapName: string, arrayOfColors: Array<[number, string]>) : void;
+
+  changeColorMap(colormap: ColorMapKeyword): Lut;
+
+  changeNumberOfColors(numberofcolors: number): Lut;
+
+  copy(lut: Lut): void;
+
+  getColor(alpha: number): Color;
+
+  setLegendLayout(layout: 'horizontal'|'vertical'): void;
+
+  setLegendOff(): void;
+
+  setLegendOn(): Mesh;
+
+  setLegendPosition(position: Vector3): void;
+
+  setMax(max: number): void;
+
+  setMin(min: number): void;
+}