Vtk/meshlab like camera

Questions
1

I want to implement a camera like Meshlab tool or vtkInteractorStyleTrackballCamera,
I tried Arc Rotate Camera, but It can not rotate to some specific angle, like “look from left side”.

2

Hi @liuzhongshu ! Welcome to babylon.js!

ArcRotateCamera can rotate to any angle.

Try to set the limits to null:

        camera.lowerAlphaLimit = null
        camera.upperAlphaLimit = null
        camera.lowerBetaLimit = null
        camera.upperBetaLimit = null
        camera.lowerRadiusLimit = 1
        camera.upperRadiusLimit = 100

You can manipulate the camera using alpha, beta and radius or set the position and the target of the camera (in this case call camera.rebuildAnglesAndRadius() to sync the values).

3

Thanks, for example:

how to control camera to get a view like this:

image
image1129×842 72.7 KB

4

You can achieve this by setting the upVector: https://playground.babylonjs.com/#VV935G#103

5

Thanks. but can i get this view using mouse or keyboard? user can not set camera using code. In Meshlab or vtk, user can get any view just using mouse.

6

When viewing both tools for the first time, I created an example PG based on a rotating video on YouTube.

meshlab : https://www.youtube.com/watch?v=gWBm5XGRJOk
PG : https://playground.babylonjs.com/#VV935G#104

vtk : https://www.youtube.com/watch?v=-Yiy_h7sT1s
PG : https://playground.babylonjs.com/#VV935G#106

7

Probably can be done with custom inputs.

This PG might also be helpful: https://playground.babylonjs.com/#GB1AW7#20

8

The last PG is very useful. Thanks very much, and I personally think this should be default behaviour for attched ArcRotateCamera.

But there is a diffrence, for vtk, the roation is on the camera instead of the model.