Shadows bug, Instanced Stereo, Forward Shading.


Found weird bug with instanced stereo, causing sort of shadows offset with broken lighting from everything, mostly noticeable on dynamic objects

Hello Pirog,

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 to reproduce this issue on our end?
  3. Could you provide screen shots of any blueprints/settings that may be involved with this issue?

Yes, I was able to reproduce this bug at empty project.

So… the setup for this bug is simple: instanced stereo + forward shading [ENABLED]
then I’ve imported simplest animated object as skeletal mesh with animation, placed in the scene, changed lighting in the scene to make this effect more obvious;
and… that’s it.

also noticed that this thing somehow projects some object from the left eye on the right one in … wrong order or so, so as you see on the latest screen, I made sort of cut-out of the image and placed just in the area, where shadows are cutting out. Makes feel that sighouette calculated wrong or something like that (not a pro, sorry)

Hello Pirog,

After doing a bit of digging I was able to find a known issue (UE-35815) that appears to have the same root cause. This issue has not been pushed to the public tacker due to sensitive information. I will provide updates with any pertinent information as it becomes available. Thank you for your time and information.

Make it a great day

From my testing this was caused by dynamic shadows on movable objects when using forward shading. I thought that dynamic shadows were not supported on movable objects with this?

On a side note, it would be really really nice if there was a lighting guide or how to for recommended setups in the forward shading mode. (if there is such a guide please let me know!)
I’ve had many odd things and keep coming across these small gotchas…
thanks :slight_smile: