@needle-tools/engine/src/engine/export/gltf/Writers.ts

Needle Engine is a web-based runtime for 3D apps. It runs on your machine for development with great integrations into editors like Unity or Blender - and can be deployed onto any device! It is flexible, extensible and networking and XR are built-in.

import { Object3D, Texture } from 'three';
import { GLTFExporterPlugin, GLTFWriter } from 'three/examples/jsm/exporters/GLTFExporter.js';

import { Gizmos } from '../../engine_gizmos.js';
import { createFlatTexture } from '../../engine_shaders.js';
import { RGBAColor } from '../../js-extensions/index.js';

declare type BeforeWriteArgs = { keep: boolean };

export abstract class BaseWriter implements GLTFExporterPlugin {
    private readonly writer: GLTFWriter;
    constructor(writer: GLTFWriter) {
        this.writer = writer;
    }
    writeNode(_node: Object3D) { }
}

export class GizmoWriter extends BaseWriter {

    beforeWriteNode(node: Object3D, args: BeforeWriteArgs) {
        if (Gizmos.isGizmo(node)) {
            args.keep = false;
        }
    }

}

export class RenderTextureWriter extends BaseWriter {

    beforeWriteTexture(texture: Texture, args: BeforeWriteArgs & { newTexture?: Texture }) {
        if (texture.isRenderTargetTexture) {
            args.newTexture = createFlatTexture(new RGBAColor(1, 1, 1, 0))
        }
    }
}