Camera Zoom inverting

[Brunex92]

Hey,

So, is there any way of the camera zoom don't invert the canvas when I reach the (0, 0, 0)?
I need to go deeper in the canvas to look at objects far away from the origin

[GameMonetize]

Hey

I assume you are using an ArcRotateCamera, correct? try using camera. allowUpsideDown = false

[Brunex92]

3 minutes ago, Deltakosh said:

Hey

I assume you are using an ArcRotateCamera, correct? try using camera. allowUpsideDown = false

Yea, I'm using ArcRotateCamera, allowUpsideDown won't work, still the same

[GameMonetize]

can you provide a playground repro?

[Brunex92]

http://www.babylonjs-playground.com/#KNMZ0#16
Basically, when I zoom in passing the center ball I want to keep going in

[GameMonetize]

Ok then just set the camera center farther than your mesh (There is no zoom per se but a radius: when you zoom you reduce the radius)

I think that you should just set the lowerRadiusLimit to 1 or even 0.1 if you really want to go closer.

A negative radius means that you went beyond the center of the camera

[Brunex92]

I understand, but this still don't solve my problem

I want to reach that sphere that is far away from the center by 'zooming in'

http://www.babylonjs-playground.com/#KNMZ0#17

putting lowerRadiusLimit will only limit the radius of the camera, when I actually want to go deeper, if there is any way of doing this

[GameMonetize]

Yep by setting the camera target on the sphere:http://www.babylonjs-playground.com/#KNMZ0#18

[Brunex92]

No other way?
there will be lots of spheres and cylinders what I really needed wat to pass by the center and keep going

[adam]

I'm not sure exactly why you need to zoom past the object you are focusing on.  

Can you just do something like this?

http://www.babylonjs-playground.com/#KNMZ0#19

Click on the spheres and zoom.

[Brunex92]

That would kinda help, but some objects will be really far away, almost unclickable

[GameMonetize]

perhaps you don;t need a ArcRotateCamera? A freeCamera could do it easily

[Brunex92]

But how do I zoom in with the scroll?
The arcRotate was a good option because I need to rotate arond the center

[aWeirdo]

@Brunex92 what you could do, is to use arcRotate for your grid area, and when your zoom hits something like 0.1, switch to a freeCamera, (update it's position & path to same as arcRotate, pre-switching) and capture mouse scrolling, so the camera moves forward when scrolling in, and moves backwards when scrolling out and when you reach your grid area again, reset to arcRotate.

Another option could be, when zoom hits 0.1, again, capture mouse scrollng, but instead of zooming, move the arcRotate's target position in the direction you're "zooming" and when you go back again, reset. 

[Brunex92]

@aWeirdo I think that would make the visualization kinda different changing cameras that way, i was looking for something like the good old gluPerspective from the old versions of OpenGL using C++

[aWeirdo]

@Brunex92 i'm not sure what you mean, or perhaps you misunderstood me, the idea was to have two cameras, at the grid area arcRotate is set as the active, but, you still update freeCamera's position & direction to constantly match the arcRotate, so when you switch to freeCamera nothing else really changes for the user, but you would ofc lose the rotational "benefits" which arcRotate have.

but anyhow, option two, with moving the arcRotate's target position would probably be the best choice between my two ideas, unless you're up for doing a bit of customization to engine.

It's quite a tricky issue^^

 

[Brunex92]

@aWeirdoOh I got it now,

So for the first option is that I've never worked with two cameras in any 3D application, and the rotational benefits from arcRotate are really necessary for me
For the second option, how can i move the target position?

I don't intend to modificate the engine at all

Edited May 5, 2016 by Brunex92
misspelling

[aWeirdo]

@Brunex92 

arcRotateCamera rotates around a target, "camera.target" (Vector3, also camera.target.x  / y or z works for specific numbers ), you would need to calculate the direction you're zooming and then calculate the next position, and update the target location acordingly.

 

[Brunex92]

@aWeirdo So basically I have to update the target everytime I zoom in, now how do I update it?

[aWeirdo]

@Brunex92
camera.setTarget = babylon vector3;  should do it, but it's some complicated stuff^^

I made a simple playground to show the idea of it(the move direction is fixed), http://www.babylonjs-playground.com/#KNMZ0#21

It needs a lot of work, smoothing out movement, calculating correct movement, disabling the camera's actual zoom when it shouldn't be enabled(when zoomed all the way in and moved away from grid), etc etc.. as i said, it's a complicated issue , many variables to think about.

good luck

[adam]

@Brunex92

Is this what you had in mind?

http://www.babylonjs-playground.com/#KNMZ0#22

[adam]

or this?

http://www.babylonjs-playground.com/#KNMZ0#23

[Brunex92]

54 minutes ago, adam said:

@Brunex92

Is this what you had in mind?

http://www.babylonjs-playground.com/#KNMZ0#22

@adam This one looks exactly what I needed! Thanks a lot!

[adam]

@Deltakosh could this be added as an option to arcRotateCamera?

If you look at the PG, I just added lines 29 - 39.

[GameMonetize]

Hey...I don't really see the gain versus using lowerRadiusLimit