Flipbook component in VR only appears in one eye.

Development Platform & Builds XR Development
, , , ,
1

Hi,

I’m trying to use a flipbook component in my VR project. It is only appearing in one eye.

Is there an easy fix for this?

Repro steps

  1. Open a VR project
  2. Add a flipbook to any object.
  3. Look at it in VR. Mine only apprea in the left eye.

Thanks
Russ

2

Hello Rstenberg,

I was unable to reproduce this issue on our end. I have a few questions for you that will help narrow down what issue it is that you are experiencing.

Quick questions:

  1. Can you reproduce this issue in a clean project?
  2. If so, could you provide a detailed list of steps (including any small steps that may have been left out of your original step) to reproduce this issue on our end?
  3. What VR device are you currently using?
3

Thanks Rudy.

So I loaded a completely fresh project in 4.14.2 and sure enough both eyes saw the flipbook. So then the itch of “Why does this not work in our engine” took over and I had to figure it out. We are using 4.14.1 with some custom things the programmers have done.

We use forward rendering so that was my first guess. Bringing up the project render settings I set all clean project settings to that of our engine. Forced engine restart. When I played it sure enough, only one eye. Looking at the settings I changed I was able to figure out Project Settings > Rendering > VR > Instanced Stereo is the culprit. The bool is unchecked by default and I got both eyes. We have the bool checked, I don’t know why I deal with characters. When checked the flipbook only appears in my left eye.

We use the Oculus Rift.

Repro Steps

  1. Start a clean UE4 project, I do not use starter content. (No render changes)
  2. Import an image
  3. Create a sprite from the image
  4. Create a flipbook from the sprite
  5. Create an actor BP
  6. Add the paper flipbook component to the actor
  7. Add the flipbook you just made to the flipbook component.
  8. Drop the actor into your scene.
  9. Play in VR.
  10. You should see the sprite on both eyes.
  11. Save the whole project
  12. Project Settings > Rendering > VR > check Instanced Stereo
  13. Forced engine restart.
  14. Load the level you just saved.
  15. Play in VR.
  16. You should only see the sprite in your left eye.

I look forward to hearing if you can reproduce that.
Russ

4

Hello Rstenberg,

After doing some digging I was able to find that this is a known issue. There is a developer note on this report stating that it affect flip books as well. I have provided a link to the public tracker. Please feel free to use the link provided for future updates.

Link: Unreal Engine Issues and Bug Tracker (UE-37611)

Make it a great day

5

I have same problem in 4.17.1 with Sprite component, bug tracker says it was fixed jun 28 but it also says "This issue has been closed as ‘Won’t Fix’ due to an extended period of time without updates. " so is it fixed or not?

6

Hello laggyluk,

I have reopened this issue. Feel free to use the link provided for future updates.

Make it a great day

7

Use Translucent blend mode instead of masked in flipbook material

8

This worked for me! Thanks!

9

Hello, the tracker indicates that this has been resolved. However in my project (forward renderer, instanced stereo) sprites and flipbook animations still only render on the left eye. (I am not sure about the editor billboards, but would surprise if it is different).

10

I also have the same issue. In fact now it’s worse because the translucent hack doesn’t work either in 4.21

11

I also have this same issue when using a sprite flipbook