So this scene I’m working on is based on IndyStry’s excellent course for making a city in Unreal Engine for cinematics. The scene is rendering fine in Lumen, but when I switch to the path-tracer, the buildings and every prop in the scene goes completely black. Any idea how to solve this?
(Win 11, 4070 TI, 13700KF, 32 GB RAM)
hi @AdamEm01 ,
There was a similar problem for Landscapes which needed a patch, which is basically about light and Pathtracing is about that
GPU Lightmass not working on Landscape
Have you enable Hardware Ray tracing
have you enabled Direct x 12 and SM6 Shader Model 6 in your project
see also Enabling Path Tracer in Unreal Engine 5.3 | Unreal Engine 5.3 Documentation
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Hi Jimbo, thanks for helping out. HWRT is on, and DX12 and SM6 are both enabled and set as the defaults. I went through and made sure everything that was supposed to be on was on, but it was all already as it should be. I looked at the options in the post-processing volume, and same again. I’m honestly stumped.
hi @AdamEm01
Looking through the manual I found the quote
Denoised Radiance Stores the denoised radiance if denoising is turned on in the post processing settings for the path tracer, and completes for the current frame, otherwise it is black.
The only other way is you Extract Zip the project in failing state and upload Personal Message. I will then try and figure out why, by baking etc
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Thanks @Jimbohalo10
I may have found the answer in this link after digging a bit deeper: Twinmotion
The short of it is that very complex scenes can’t be rendered in the path tracer. And there were a lot of objects and complex meshes in my scene. The path tracer actually worked when I initially loaded up the scene, and the background landscapes would start to get rendered. But then all the massive buildings would load in, and everything went black. So I think it’s only going to be suitable for smaller to medium sized scenes.
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