What will influence the visual effect of a 3D video?

To be able to provide the illusion of depth when viewing the video (3D effect), 3D devices will use special projection hardware or eyewear so that your eyes will see a different perspective of the image. The following factors will influence the effect of 3D video:

1) The distance between the person and the screen of the TV or PC. 
For 3D video playback on a 3D computer, you can adjust the 3D scene depth to help your eyes see the 3D video comfortably. For 3D video playback on 3D TV, you can look for the best location to watch 3D videos and adjust the 3D scene depth on your 3D TV.

2) The angle between the person and the screen of the TV or PC. 
It’s recommended to be directly in front of the screen to be able to get the proper effect. 

3) The pupil distance of a person. But this influence is not obvious.

Tip:
To get a better visual effect on the TV, you need to convert the source video to a HD 3D video. If the source video doesn't have a high resolution, the visual effect will not be very good.