Point of View in ThreeJS Camera

When working with ThreeJS, I need to determine how to find the coordinate of a point that is exactly 1 unit in the direction the camera is facing, even when the camera is rotated at various angles.

The rotation angles in ThreeJS can be quite confusing for those unfamiliar with them.

For instance, if all rotation variables are set to 0, then the expected result would be (0, 0, -1).

If the rotation around the x-axis is Pi / 2 (90 degrees), then the expected result would be (1, 0, 0).

I am looking to create a function to accurately calculate this. The main focus should be on the mathematical aspect of it.

javascriptalgorithmmathrotationthree.js

Answer №1

If you're looking to find the global position of a point located one unit in front of your camera, there's a simple solution.

Firstly, create an object positioned directly in front of the camera and make it a child of the camera itself. This allows you to easily access the world position of this object.

In its default state, when a camera's rotation is set to (0, 0, 0), it is oriented along its negative z-axis. Follow this setup:

var customObject = new THREE.Object3D();
customObject.position.set(0, 0, -1);

scene.add(camera); // necessary when the camera has children
camera.add(customObject);

Now, obtaining the desired point becomes straightforward:

var targetPos = new THREE.Vector3(); // initialize once for repeated use

...

camera.updateMatrixWorld(); // usually invoked within the rendering loop

targetPos.setFromMatrixPosition(customObject.matrixWorld);

This method applies to three.js revision 71.

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