Question Screen Space reflection produce an additional grey looking reflection. See screen shot.

As shown in the screenshot blow, see the testing red ball, the reflection on the marble has a secondary grey reflection. Does any know why and how I got it? I've spent 4 hours trying to figure this out, and I couldn't. Help needed!


This is another clearer screen shot with a cube and a ball

 

That’s just a limitation of SSR in general. (I think you can set it up to fallback to a cubemap in that area so you have more appropriate colors there instead of gray)

 

It has the correct red reflection. The additional gray ones comes from nowhere. Using probe has other limitations. for now I want figure out the HDRP SSR, because everything else looks fine.

 

Did you try to adjust SSR settings?
I'm having the same issues. I think SSR affects how camera is placed and what is scale of your prefabs with the rest of the world.

You have jagged edges. I think number of ray steps could improve this.

 

Read up on how SSR works.

Very quickly: the basic idea is that it takes the rendered image, calculates the reflection vectors (based on normal and depth) and finds where in the already rendered image the reflection should hit.

The issue (or one of) is that things that aren’t already in the rendered image cannot be reflected.

See the part of the fence, that should be reflected, but instead has the “grey reflection”. That part is occluded by the sphere, as such SSR has no information to use there and instead outputs grey.

SSR in general kinda sucks and looks ugly. Unity’s implementation is not great but it’s not bad either, it’s just that the method in general has so many shortcomings, I don’t know why games still use it.

 

Thanks, I just ordered 2080ti, and I will see how DXR reflection does for the scene. For now, I guess I'll have to stick with probes.

 

Copy entire scene and render it flipped Not being silly, sometimes just stencil, or use a transparent effect for key parts if the above fails.

 

@Remy_Unity would it be possible to replace existing SSR code with something more adaptable and functionale in such situations?

 

Yes, probes works. But I didn't think about having them work together. Now it's clear that I need both.