RayTraced Reflections problem

KirilZangagolev · May 2020

Hey guys, I have a weird problem with ray traced reflections. On the first image its just a lowpoly cube with metalic and 0 roughness in the engine. The next images I made a few mirror objects with highpoly baked normal and standard unique textures from painter. The baked objects look really weird with ray traced reflections. How do I fix this?

Image: https://us.v-cdn.net/5021068/uploads/editor/uy/e3bn7vcmf5br.png

Image: https://us.v-cdn.net/5021068/uploads/editor/mi/c4k6euftaxeq.png

Image: https://us.v-cdn.net/5021068/uploads/editor/wu/ph94a6ihpfky.png

Obscura · May 2020

Don't use a normal map on the glass parts? Its unnecessary anyways. Its a completely flat surface. A roughness map is more useful.

It looks like you have 2 different issues occuring with those normal maps.
Image2: Wrong tangent space
Image3: low precision normal map.

KirilZangagolev · May 2020

Yeah thank you when I remove the normal the noisiness goes away but how do I change the tangent space so there isn't that distortion?

Obscura · May 2020

Substance should bake for mikk tangent space by default. Thats what Unreal engine uses.

KirilZangagolev · May 2020

But I dont have a normal on the mirror polygon anymore

Obscura · May 2020

And its still warping?

KirilZangagolev · May 2020

Obscura · May 2020

Look at the world normal pass, and see if it shows flat there.

rollin · May 2020

Could it be the mesh normals of that mirror / frame aren't pointing straight forward?

KirilZangagolev · May 2020

world normal isnt flat

KirilZangagolev · May 2020

OMG such a dumb problem. I had the mirror objects as one smoothing group before export for unreal. When the mirror polygon is its own smoothing group the world normal is flat and the reflection is correct.

Obscura · May 2020

Thats why we were suggesting looking at the world normal pass.

RayTraced Reflections problem

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