Three.js 三个JS-缩放纹理以完美匹配（任意大小）平面

本质上，我想复制CSS的行为，

background size:cover

是如何工作的

    var repeatX, repeatY;
repeatX = w * this.textureHeight / (h * this.textureWidth);
if (repeatX > 1) {
  //fill the width and adjust the height accordingly
  repeatX = 1;
  repeatY = h * this.textureWidth / (w * this.textureHeight);
  mat.map.repeat.set(repeatX, repeatY);
  mat.map.offset.y = (repeatY - 1) / 2 * -1;
} else {
  //fill the height and adjust the width accordingly
  repeatX = w * this.textureHeight / (h * this.textureWidth);
  repeatY = 1;
  mat.map.repeat.set(repeatX, repeatY);
  mat.map.offset.x = (repeatX - 1) / 2 * -1;
}

看这里，您可以看到图像正在缩放，以保持其纵横比，但它并没有真正正常工作，因为图像没有填充平面，任一侧都留有边距-

代码片段（第170-175行）-

我想做的是让它如此放大，然后将自己重新定位在中心位置（封面的效果如何）

更新

    var repeatX, repeatY;
repeatX = w * this.textureHeight / (h * this.textureWidth);
if (repeatX > 1) {
  //fill the width and adjust the height accordingly
  repeatX = 1;
  repeatY = h * this.textureWidth / (w * this.textureHeight);
  mat.map.repeat.set(repeatX, repeatY);
  mat.map.offset.y = (repeatY - 1) / 2 * -1;
} else {
  //fill the height and adjust the width accordingly
  repeatX = w * this.textureHeight / (h * this.textureWidth);
  repeatY = 1;
  mat.map.repeat.set(repeatX, repeatY);
  mat.map.offset.x = (repeatX - 1) / 2 * -1;
}