three-to-littlejs.ts

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`39d08b63` 2026-10-20 Pavel Safronov	1	/**
	2	* Adapter utilities for converting Three.js concepts to LittleJS
	3	*/
	4
	5	import * as THREE from 'three'
	6
	7	export class ThreeToLittleJSAdapter {
	8	/**
	9	* Convert a Three.js Color to a number suitable for LittleJS
	10	*/
	11	static convertColor(threeColor: THREE.Color): number {
	12	const r = Math.round(threeColor.r * 255)
	13	const g = Math.round(threeColor.g * 255)
	14	const b = Math.round(threeColor.b * 255)
	15	return (r << 16) \| (g << 8) \| b
	16	}
	17
	18	/**
	19	* Convert a Three.js Vector3 to a LittleJS position array
	20	*/
	21	static convertVector3(vec: THREE.Vector3): [number, number, number] {
	22	return [vec.x, vec.y, vec.z]
	23	}
	24
	25	/**
	26	* Convert a Three.js Vector4 to a LittleJS array
	27	*/
	28	static convertVector4(vec: THREE.Vector4): [number, number, number, number] {
	29	return [vec.x, vec.y, vec.z, vec.w]
	30	}
	31
	32	/**
	33	* Create a basic LittleJS material equivalent from Three.js material properties
	34	*/
	35	static createBasicMaterial(options: {
	36	color?: THREE.Color,
	37	transparent?: boolean,
	38	opacity?: number,
	39	emissive?: THREE.Color,
	40	emissiveIntensity?: number
	41	}): any {
	42	const result: any = {}
	43
	44	if (options.color) {
	45	result.color = this.convertColor(options.color)
	46	}
	47
	48	if (options.transparent !== undefined) {
	49	result.transparent = options.transparent
	50	}
	51
	52	if (options.opacity !== undefined) {
	53	result.opacity = options.opacity
	54	}
	55
	56	if (options.emissive) {
	57	result.emissive = this.convertColor(options.emissive)
	58	result.emissiveIntensity = options.emissiveIntensity \|\| 1.0
	59	}
	60
	61	return result
	62	}
	63
	64	/**
	65	* Adapt a Three.js shader uniform object to LittleJS format
	66	*/
	67	static adaptUniforms(threeUniforms: Record<string, any>): Record<string, any> {
	68	const adapted: Record<string, any> = {}
	69
	70	for (const [name, uniform] of Object.entries(threeUniforms)) {
	71	if (uniform.value instanceof THREE.Color) {
	72	adapted[name] = this.convertColor(uniform.value)
	73	} else if (uniform.value instanceof THREE.Vector3) {
	74	adapted[name] = this.convertVector3(uniform.value)
	75	} else if (uniform.value instanceof THREE.Vector4) {
	76	adapted[name] = this.convertVector4(uniform.value)
	77	} else if (typeof uniform.value === 'number') {
	78	adapted[name] = uniform.value
	79	}
	80	}
	81
	82	return adapted
	83	}
	84	}