Question

As I understood the only method to compute collisions with three.js is intersectObjects with a ray …

I created an object that includes the basic elements of the collision : ground, walls, objects, stairs. with the firstpersoncontrols. I went with the idea that I should calculate the steering vector based on the direction in which the camera is currently traveling but it does not really work and I do not see where the error is.

I expected that the camera can not pass through ground, walls and objects with which she finds herself in a collision.

You can see the code here

Answer 1

three.js has no automatic collision detection.

You implement ray-casting with Raycaster now, not Ray:

Raycaster.intersectObjects( objects, recursive );

You also have to control the elevation of the camera yourself.

three.js r.54