Achieving object rotation in three.js by synchronizing with the camera

Question

Achieving object rotation in three.js by synchronizing with the camera

I'm currently working on making an object follow the camera to create a rifle viewfinder effect. I am using OrbitControl, but I've run into an issue with the camera rotation range. The camera.rotation.y property only goes from -PI/2 to PI/2, even though I can rotate the camera a full 360 degrees. I'm having trouble understanding this limitation and would appreciate some help!

Here's a snippet of my code:

pivot = new THREE.Object3D();
pivot.add(viewfinder);//adding viewfinder as a child of pivot
scene.add( pivot );

Later on in the code:

pivot.rotation.y = camera.rotation.y;

Although this allows me to rotate my viewfinder, it is shifted by Pi/2 for some reason. To fix this, I adjusted the rotation as follows:

pivot.rotation.y = (camera.rotation.y - (Math.PI/2));

With this adjustment, I can now rotate the viewfinder with the camera within a range of 180 degrees. How can I achieve a full 360-degree rotation? Any assistance would be greatly appreciated. Thank You.

javascript camera three.js rotation

Answer 1

Answer №1

Do you need the mesh to constantly align with your camera's position? One way is to utilize the camera matrix to adjust mesh rotation, like this:

mesh.rotation.setRotationFromMatrix(camera.matrix)

. However, be cautious if your mesh has a parent entity. Alternatively, you can employ the lookAt() function by using mesh.lookAt(camera.position). Both methods should achieve the desired effect.

Answer 2

Do you need the mesh to constantly align with your camera's position? One way is to utilize the camera matrix to adjust mesh rotation, like this:

mesh.rotation.setRotationFromMatrix(camera.matrix)

. However, be cautious if your mesh has a parent entity. Alternatively, you can employ the lookAt() function by using mesh.lookAt(camera.position). Both methods should achieve the desired effect.

Answer 3

Answer №2

In my experience with THREE JS and testing it using "PointerLockControls," I discovered a way to make an object have the same Y rotation as the camera by following these steps:

const getCameraRotate = new THREE.Vector3();
        camera.getWorldDirection( getCameraRotate);
        getCameraRotate.y = 0;
        getCameraRotate.add( object.position );
        object.lookAt( getCameraRotate );

If you also want the object to have the same X, Y, and Z rotation as the camera, simply use:

object.rotation.copy(camera.rotation)

And if you wish for the object to have the same position as the camera, you can achieve it with this code:

object.position.copy (new THREE.Vector3 (camera.position.x, camera.position.y, camera.position.z));

However, keep in mind that placing the object at the exact same position as the camera may result in visibility issues since you would be inside the object. You can adjust the positioning by changing values like this:

new THREE.Vector3 (camera.position.x-5, camera.position .y -5, camera.position.z)

Answer 4

In my experience with THREE JS and testing it using "PointerLockControls," I discovered a way to make an object have the same Y rotation as the camera by following these steps:

const getCameraRotate = new THREE.Vector3();
        camera.getWorldDirection( getCameraRotate);
        getCameraRotate.y = 0;
        getCameraRotate.add( object.position );
        object.lookAt( getCameraRotate );

If you also want the object to have the same X, Y, and Z rotation as the camera, simply use:

object.rotation.copy(camera.rotation)

And if you wish for the object to have the same position as the camera, you can achieve it with this code:

object.position.copy (new THREE.Vector3 (camera.position.x, camera.position.y, camera.position.z));

However, keep in mind that placing the object at the exact same position as the camera may result in visibility issues since you would be inside the object. You can adjust the positioning by changing values like this:

new THREE.Vector3 (camera.position.x-5, camera.position .y -5, camera.position.z)

Achieving object rotation in three.js by synchronizing with the camera

Answer №1

Answer №2

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