Method renderReadback

src/Readback.ts:303–334

({
    reader,
    count,
    renderer,
    readback,
  }: {
    reader: Rgba8Readback;
    count: number;
    renderer?: THREE.WebGLRenderer;
    readback: B;
  })

  // Perform a render and readback operation for the given Rgba8Readback,
  // and readback buffer (call ensureBuffer first).
  async renderReadback<B extends ReadbackBuffer>({
    reader,
    count,
    renderer,
    readback,
  }: {
    reader: Rgba8Readback;
    count: number;
    renderer?: THREE.WebGLRenderer;
    readback: B;
  }): Promise<B> {
    this.renderer = renderer || this.renderer;
    if (!this.renderer) {
      throw new Error("No renderer");
    }

    this.ensureCapacity(count);

    const { program, material } = this.prepareProgramMaterial(reader);
    program.update();

    const renderState = this.saveRenderState(this.renderer);

    // Generate output
    this.process({ count, material });

    // Initiate readback
    const promise = this.read({ readback });

    this.resetRenderState(this.renderer, renderState);
    return promise;
  }

  getTexture(): THREE.DataArrayTexture | undefined {
    return this.target?.texture;