Path tracer cannot finish rendering and constantly set back progress

Development Rendering
1

It seems with UE 5 path tracer render progress is turned on by default, it shows that the path tracer just cannot proceed with current render, it will reset the progress to zero and restart and repeat.

It just cannot finish one complete path trace period and finish the rendering.

I have skeletal meshes and translucent materials but I think they are supported as written in the document

< Supported Features of the Path Tracer>
Any body knows why this happens?

2

Did you ever solve this? I just began experiencing it and can’t seem to get it to stop restarting.

1 Like
3

No I can’t…

4

you should switch off all animations and moving objects

6

I think you are right.
But I have two aspect for this.

  1. The first moving stuff is an water material with animated tesselated surface

2.The second “moving” thing is a static mesh with an SSS material.
I’ve tried to isolate them seperately but they are produce the problem.

7

Still the same? I’m experiencing something similar when having a fire (niagara particles) in my scene

1 Like
8

No luck
Appears to me that only static scenes work

9

I’m experiencing this in 5.4.1. The path tracer just keeps updating, the scene is very simple, no moving objects or cameras.

10

I have the same issue in 5.4.1, only in a specific level. All dynamic actors have been removed and the path tracer stuck at starting

11

The issue persists in 5.4.2.

12

What helped me, was closing the sequencer and/or turning off my character in the viewport plus going in Sequencer back to 0, so it was resetting :slight_smile: Now its working <3

13

issue still happening to me on 5.4. If anyone finds a fix for this please let me know.

What I did notice is that after I added a bunch of objects in my world it just disabled path tracing and prevented it from going up. Like even when I’d delete the objects and hide everything so the scene had nothing but an empty cube the path tracer would still stay stuck.

The only fix for me was to completely create a new level but I’m not too sure.

14

This may or may not work depending on your scene, but what usually helps solve this issue for me is disabling TSR in the rendering settings. Just set your anti aliasing method to none. This allowed me to get and finish a render in the viewport. Hope that helps!

15

what is tsr?