v-always-look-at 👀 deprecated since v4

WARNING

This directive has been removed on the v4 due incompatibility with the new renderer loop.

With the new directive v-always-look-at provided by TresJS, you can add easily command an Object3D to always look at a specific position, this could be passed as a Vector3 or an Array.

Usage

<script setup lang="ts">
import { TresCanvas, vAlwaysLookAt } from '@tresjs/core'
import { Box } from '@tresjs/cientos'
</script>
<template>
    <TresCanvas >
      <TresPerspectiveCamera :position="[0, 2, 5]" />
      <Box
        v-always-look-at="new Vector3(0, 0, 0)"
      />
  </TresCanvas>
</template>

No matter where the Box move will always look-at the position [0,0,0]

Why not use the in built method look-at?

You could ask, this is fine but I can use the :look-at method directly in the component, why should I need this?

The answers is that with the method :look-at you will indicate to look at that position just once, when the instance is mounted, then if the object changes this will not get updated.

You can look at other instance too!

Another advantage is that you can look at an instance in movement, for example with the camera, like so:

<script setup lang="ts">
import { shallowRef } from 'vue'
import { TresCanvas, useRenderLoop, vAlwaysLookAt } from '@tresjs/core'
import { Box } from '@tresjs/cientos'

const sphereRef = shallowRef()

const { onLoop } = useRenderLoop()

// here we update the position of the sphere and the camera will always follow the object
onLoop(({ elapsed }) => {
  if (sphereRef.value) {
    sphereRef.value.value.position.y = Math.sin(elapsed) * 1.5
  }
})
</script>
<template>
    <TresCanvas >
      <TresPerspectiveCamera :position="[0, 2, 5]"
        v-always-look-at="sphereRef"
      />
      <Sphere
        ref="sphereRef"
        :scale="0.5"
      />
  </TresCanvas>
</template>