I'm having trouble getting the look-at functionality of Ar.js to work dynamically with JavaScript. The 3D object isn't properly oriented towards the screen for some reason.
I'm having trouble getting the look-at functionality of Ar.js to work dynamically with JavaScript. The 3D object isn't properly oriented towards the screen for some reason.
To adjust the orientation of the look-at component using JavaScript, simply include it in any a-frame entity:
// Setting a pre-existing entity as the target
entity.setAttribute("look-at", "#selector");
// Using a Vector3 position as the target
entity.setAttribute("look-at", {x: 0, y: 0, z: 0})
The look-at component (along with its accompanying lookAt method) assumes that the model is aligned with the z-axis.
In the case of the duck model being oriented along the x axis, consider reorienting it in a 3D modeling tool like Blender.
Alternatively, utilize a parent node to adjust its orientation:
<!-- Parent node will face the user --/>
<a-entity look-at="[camera]">
<!-- Child node with a rotation offset -->
<a-entity rotation="0 -90 0" gltf-model ....>
Explore this solution further on this Glitch page.
For multiple models, create a rotation offset array and apply it to the [gltf-model] node whenever loading a new model.
The <a-camera> comes equipped with a default camera. Modify its properties by adjusting the <a-camera> attributes:
<a-camera fov="60" ....></a-camera>
To make your entity face the camera, use the lookAt method on the object3D property of the entity. Here's an example:
var camera = document.querySelector("[camera]");
var camPosition = camera.object3D.position;
entityEl.object3D.lookAt(new THREE.Vector3(camPosition.x, camPosition.y, camPosition.z));
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