Nuxt環境にてthree.jsを利用する際、loaderやcontrolesも利用することが圧倒的に多いと思います。
自分の中で利用方法が固まってきたのでメモ。
こうした方がいいよーなどあればよろしくお願いします。

before

threeComp.vue

...
<script>
import * as THREE from 'three'
import 'imports-loader?THREE=three!three/examples/js/loaders/OBJLoader.js'
import 'imports-loader?THREE=three!three/examples/js/loaders/MTLLoader.js'
import 'imports-loader?THREE=three!three/examples/js/loaders/PLYLoader.js'
import 'imports-loader?THREE=three!three/examples/js/loaders/GLTFLoader.js'
import 'imports-loader?THREE=three!three/examples/js/controls/OrbitControls.js'

export default {
  name: 'threeComp',
  methods: {
    init () {
      const scene = new THREE.Scene()
      ..

error log


..
100:26-41 "export 'OBJLoader' (imported as 'THREE') was not found in 'three'
..
101:26-41 "export 'MTLLoader' (imported as 'THREE') was not found in 'three'
..

動くのですがエラー吐いてます。まずいですね。

after

new! /plugins/three.js


import Vue from 'vue'
import * as THREE from 'three'
import 'imports-loader?THREE=three!three/examples/js/loaders/OBJLoader.js'
import 'imports-loader?THREE=three!three/examples/js/loaders/MTLLoader.js'
import 'imports-loader?THREE=three!three/examples/js/loaders/PLYLoader.js' 
import 'imports-loader?THREE=three!three/examples/js/loaders/GLTFLoader.js'  
import 'imports-loader?THREE=three!three/examples/js/controls/OrbitControls.js'
Vue.use({
  install (Vue, options) {
    Vue.prototype.$THREE = THREE
  }
})

add nuxt.config.js


module.exports = {
  plugins: [
..
    { src: '~plugins/three', ssr: false }, |
..
  ],
}

mod threeComp.vue

...
<script>
// import * as THREE from 'three'
// import 'imports-loader?THREE=three!three/examples/js/loaders/OBJLoader.js'
// import 'imports-loader?THREE=three!three/examples/js/loaders/MTLLoader.js'
// import 'imports-loader?THREE=three!three/examples/js/loaders/PLYLoader.js'
// import 'imports-loader?THREE=three!three/examples/js/loaders/GLTFLoader.js'
// import 'imports-loader?THREE=three!three/examples/js/controls/OrbitControls.js'

export default {
  name: 'threeComp',
  methods: {
    init () {
      // const scene = new THREE.Scene()
      const scene = new this.$THREE.Scene()
      ..

でうまくいきます。three(+α)をvueに配置しているので、ごく一部でthreeを利用している場合は読み方変えた方がいいと思います。