trois/src/App.vue

<template>
  <Renderer ref="renderer" antialias orbit-ctrl resize="window">
    <Camera :position="{ z: 10 }" />
    <Scene>
      <PointLight :position="{ y: 50, z: 50 }" />
      <Box ref="box" :rotation="{ y: Math.PI / 4, z: Math.PI / 4 }">
        <LambertMaterial />
      </Box>
    </Scene>
  </Renderer>
</template>

<script>
export default {
  mounted() {
    const renderer = this.$refs.renderer;
    const box = this.$refs.box.mesh;
    renderer.onBeforeRender(() => {
      box.rotation.x += 0.01;
    });
  },
};
</script>

<style>
body, html {
  margin: 0;
}
canvas {
  display: block;
}
</style>