I'm trying to attach an object to the camera so that it can be used more more or less as a GUI element.

My camera is defined as follows:

camera = new THREE.PerspectiveCamera( 45, windowWidth / windowHeight, 1, 2000 );
camera.position.z = 100;

In my init(), I define the object to be added:

    obj = new THREE.Mesh(new THREE.CubeGeometry(5, 5, 5, 1, 1, 1),
new THREE.MeshBasicMaterial({ color: 0xFFFFFF } ));
    obj.position.set( 0, 0, -50);
    camera.add(obj);

But, the block does not show up. I have tried adding this object to scene, and it is visible. I added a loop to animate() that will slide the object's z position between (-50, 50), but I can't see it.

I tried using camera.lookAt(obj) and logging the world position of obj (obj position + camera position), and they behave as expected. World position seems to be what I'd expect, and camera.lookAt flips the camera when the z position crosses 0.

I apologize for not providing more clear example code, but I will do my best to cooperate with anyone trying to help me. Thanks!

I'm trying to attach an object to the camera so that it can be used more more or less as a GUI element.

My camera is defined as follows:

camera = new THREE.PerspectiveCamera( 45, windowWidth / windowHeight, 1, 2000 );
camera.position.z = 100;

In my init(), I define the object to be added:

    obj = new THREE.Mesh(new THREE.CubeGeometry(5, 5, 5, 1, 1, 1),
new THREE.MeshBasicMaterial({ color: 0xFFFFFF } ));
    obj.position.set( 0, 0, -50);
    camera.add(obj);

But, the block does not show up. I have tried adding this object to scene, and it is visible. I added a loop to animate() that will slide the object's z position between (-50, 50), but I can't see it.

I tried using camera.lookAt(obj) and logging the world position of obj (obj position + camera position), and they behave as expected. World position seems to be what I'd expect, and camera.lookAt flips the camera when the z position crosses 0.

I apologize for not providing more clear example code, but I will do my best to cooperate with anyone trying to help me. Thanks!

• javascript
• three.js
• webgl

1 Answer 1

Did you add the camera to the scene?

scene.add( camera );

The camera does not usually have to be added to the scene, but in this case, the object is a child of the camera, so you must.

three.js r.58