FreeCamera rotation only for Alpha

[Max_Cohen]

Hi, there.

How to make a FreeCamera rotate only by Alpha rotation? Only longitudinal? I want to turn off a Beta rotation (up and down rotation of camera).

Thanks.

[RaananW]

Hi @Max_Cohen, welcome to the forum!

I assume you mean the ArcRotate camera?

The simplest way is to set the upper and lower limits to be the same value. check lines 5 and 6 in this example: https://playground.babylonjs.com/index.html#4SYNYY

[Wingnut]

@RaananW / others... if MC DID mean FreeCamera... and wants to prevent a freeCamera's .beta-like movement (x-axis rotation), how might that be done? 

Should freeCams HAVE a .pitchLimit and .yawLimit?

In a PM, I showed Max this:

scene.beforeRender = function() {
     myFreeCamera.rotation.x = 0;  // or possibly use myFreeCamera.cameraDirection.x = 0;    (thx Raanan) 
};

But, this method is rather hacky and forceful.  Does anyone know better ways of preventing FreeCamera x-rot?  (thx!)

[RaananW]

The cleanest way I could think of is to create new inputs (keyboard and pointers/mouse) and prevent rotation on the local(!) x axis. which is technically - keeping camera.cameraDirection.x at 0.

Another hack would be to remove the up and down keys from the keyboard, so the inputs wouldn't react to upa nd down. But this is not a true solution to the question. Just partly working.

[Max_Cohen]

13 hours ago, Wingnut said:

scene.beforeRender = function() {
     myFreeCamera.rotation.x = 0;
};

Hi, there! Thanks all for your answers and ideas. This is working to me.

Now, I want to read docs and want to do this idea. If I will do it, I will write my way there.

13 hours ago, RaananW said:

I could think of is to create new inputs