3D Camera shifts the Lightsword Hilt and Tip position

RoliKreis
RoliKreis Posts: 13 Just Starting Out*
in Post-production techniques

Hello

Initial situation

  • I use a Lightsword Ultra (2-Point Auto) effect on a grade.
  • The grade is 2D.
  • The positions of the hilt and tip are each connected to a point.
  • I determined the positions of the points with a tracker (tracking the position of a grip in a mans hand)

So far, everything works perfectly, the light sword is "attached" the mans hand, and moves in a correct position with the hand movement.

PROBLEM

  • Now I added a 3D camera, because there should be a 3D model in the scene too.
  • As soon as the 3D camera is active, the light sword hilt and tip positions are SHIFTED. They are no longer at the correct position

Conclusion

  • It looks like the 3D cam affects the hilt and tip position
  • As long a the 3D cameras Transform properties are reset to its default values, there is NO SHIFT
  • but as soon as the 3D Camera has some movement, the light sword hilt and tip positions are moved with the camera

Question

  • How can I detach the light sword positions from 3D camera movement?
  • It makes no sense for me that this 2D effect is affected by a 3D camera, especially its position is tracked on a 2D media.

Many thanks for your support!

Roli

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Answers

  • laconstantedeplanck
    laconstantedeplanck Posts: 123 Enthusiast

    Hi @RoliKreis

    I'm invoking @Triem23 as it seems to be related to the way layers are rendered on the layer stack. Have you tried applying the effect directly on the video layer instead of on the grade layer?

    If the layers are 2D, there shouldn't be any offset as far as I know, but maybe I'm wrong.

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  • RoliKreis
    RoliKreis Posts: 13 Just Starting Out*

    Hi

    Same "shift" if the Lightsword effect is directly added on the video layer.

    Conclusion: The Lightsword effect interprets 2D-points as 3D, as soon as a camera is active. Perhaps a bug?

    #1: Camera off: 2D points are at the correct position

    image.png
    image.png

    #2: Camera on: 2D points are at the correct position, but Hilt and Tip are shifted by 200 to the left

    image.png
    image.png

    #3: Camera on, points changed to 3D: Hilt and Tip are on position of the shifted points

    image.png
    image.png

    Conclusion: The Lightsword effect interprets 2D-points as 3D, as soon as a camera is active

    image.png


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  • Triem23
    Triem23 Posts: 20,403 Power User
    edited March 2022

    @laconstantedeplanck all I can do is verify I'm seeing the same behavior as @RoliKreis .

    That's a bug.

    @Ady

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